US Patent Application for C-terminal modified oxamyl dipeptides as inhibitors of the ICE/ced-3 family of cysteine proteases Patent Application (Application #20050020504 issued January 27, 2005) (2024)

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. application Ser. No. 09/745,204 filed Dec. 19, 2000 and U.S. application Ser. No. 09/177,549 filed Oct. 22, 1998, and claims the benefit of PCT Application No. PCT/US99/15074 filed Jul. 1, 1999 and Provisional Application No. 60/091,689 filed Jul. 2, 1998 (each of which applications are hereby incorporated by reference in their entirety).

TECHNICAL FIELD

The present invention relates to novel classes of compounds which are inhibitors of interleukin-1β converting enzyme and related proteases (“ICE/ced-3 family of cysteine proteases”), as well as pharmaceutical compositions comprising these compounds and to methods of using such pharmaceutical compositions.

BACKGROUND OF THE INVENTION

Interleukin 1 (“IL-1”) is a major pro-inflammatory and immunoregulatory protein that stimulates fibroblast differentiation and proliferation, the production of prostaglandins, collagenase and phospholipase by synovial cells and chondrocytes, basophil and eosinophil degranulation and neutrophil activation. Oppenheim, J. H. et al., Immunology Today, 7:45-56 (1986). As such, it is involved in the pathogenesis of chronic and acute inflammatory and autoimmune diseases. IL-1 is predominantly produced by peripheral blood monocytes as part of the inflammatory response. Mosely, B. S. et al., Proc. Nat. Acad. Sci., 84:4572-4576 (1987); Lonnemann, G. et al., Eur. J. Immunol., 19:1531-1536 (1989).

IL-1β is synthesized as a biologically inactive precursor, proIL-1β. ProIL-1β is cleaved by a cysteine protease called interleukin-1β converting enzyme (“ICE”) between Asp-116 and Ala-117 to produce the biologically active C-terminal fragment found in human serum and synovial fluid. Sleath, P. R. et al., J. Biol. Chem., 265:14526-14528 (1992); A. D. Howard et al., J. Immunol., 147:2964-2969 (1991).

ICE is a cysteine protease localized primarily in monocytes. In addition to promoting the pro-inflammatory and immunoregulatory properties of IL-1β, ICE, and particularly its hom*ologues, also appear to be involved in the regulation of cell death or apoptosis. Yuan, J. et al., Cell, 75:641-652 (1993); Miura, M. et al., Cell, 75:653-660 (1993); Nett-Giordalisi, M. A. et al., J. Cell Biochem., 17B:117 (1993). In particular, ICE or ICE/ced-3 hom*ologues are thought to be associated with the regulation of apoptosis in neurogenerative diseases, such as Alzheimer's and Parkinson's disease. Marx, J. and M. Baringa, Science, 259:760-762 (1993); Gagliardini, V. et al., Science, 263:826-828 (1994).

Thus, disease states in which inhibitors of the ICE/ced-3 family of cysteine proteases may be useful as therapeutic agents include: infectious diseases, such as meningitis and salpingitis; septic shock, respiratory diseases; inflammatory conditions, such as arthritis, cholangitis, colitis, encephalitis, endocerolitis, hepatitis, pancreatitis and reperfusion injury, ischemic diseases such as the myocardial infarction, stroke and ischemic kidney disease; immune-based diseases, such as hypersensitivity; auto-immune diseases, such as multiple sclerosis; bone diseases; and certain neurodegenerative diseases, such as Alzheimer's and Parkinson's disease. Such inhibitors are also useful for the repopulation of hematopoietic cells following chemo- and radiation therapy and for prolonging organ viability for use in transplantation.

ICE/ced-3 inhibitors represent a class of compounds useful for the control of the above-listed disease states. Peptide and peptidyl inhibitors of ICE have been described. However, such inhibitors have been typically characterized by undesirable pharmacologic properties, such as poor oral absorption, poor stability and rapid metabolism. Plattner, J. J. and D. W. Norbeck, in Drug Discovery Technologies, C. R. Clark and W. H. Moos, Eds. (Ellis Horwood, Chichester, England, 1990), pp. 92-126. These undesirable properties have hampered their development into effective drugs.

Accordingly, the need exists for compounds that can effectively inhibit the action of the ICE/ced-3 family of proteases, for use as agents for preventing unwanted apoptosis, and for treating chronic and acute forms of IL-1 mediated diseases such as inflammatory, autoimmune or neurodegenerative diseases. The present invention satisfies this need and provides further related advantages.

SUMMARY OF THE INVENTION

In general, the compounds of this invention incorporate a (N-substituted)oxamyl group as a dipeptide mimetic. The resulting compounds exhibit improved properties relative to their peptidic counterparts, for example, such as improved cell penetration or improved absorption and metabolic stability resulting in enhanced bioavailability. This application claims priority from U.S. Provisional Application No. 60/091,689, filed Jul. 2, 1998, and U.S. application Ser. No. 09/177,549, filed Oct. 22, 1998 (both of which are hereby incorporated by reference in their entirety).

One aspect of the instant invention is the compounds of the Formula I:
wherein A, B, R1, R1′ and R2 are as defined below, as well as pharmaceutically acceptable salts thereof

A further aspect of the instant invention is a pharmaceutical composition comprising a compound of the above Formula I and a pharmaceutically-acceptable carrier therefor.

Another aspect of this invention involves a method for treating an autoimmune disease comprising administering an effective amount of a pharmaceutical composition discussed above to a patient in need of such treatment.

Yet another aspect of the instant invention is a method for treating an inflammatory disease comprising administering an effective amount of a pharmaceutical composition discussed above to a patient in need of such treatment.

A further aspect of the instant invention is a method for treating a neurodegenerative disease comprising administering an effective amount of a pharmaceutical composition discussed above to a patient in need of such treatment.

Another aspect of the instant invention is a method of preventing ischemic injury to a patient suffering from a disease associated with ischemic injury comprising administering an effective amount of the pharmaceutical composition discussed above to a patient in need of such treatment.

A further aspect of the instant invention is a method for expanding of hematopoietic cell populations and/or enhancing their survival by contacting the cells with an effective amount of the pharmaceutical composition discussed above. Cell populations included in the method of the invention include (but are not limited to) granulocytes, monocytes, erthrocytes, lymphocytes and platelets for use in cell transfusions.

An alternate aspect of the instant invention is a method of prolonging the viability of an organ that has been removed from the donor for the purpose of a future transplantation procedure, which comprises applying an effective amount of the pharmaceutical composition discussed above to the organ, thereby prolonging the viability of the organ as compared to an untreated organ. The organ may be an intact organ, or isolated cells derived from an organ (e.g., isolated pancreatic islet cells, isolated dopaminergic neurons, blood or hematopoietic cells).

These and other aspects of this invention will be evident upon reference to the following detailed description.

DETAILED DESCRIPTION OF THE INVENTION

As mentioned above, one aspect of the instant invention is the compounds of the Formula I:
wherein:

  • A is a natural or unnatural amino acid of Formula IIa-i:

B is a hydrogen atom, a deuterium atom, alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, substituted naphthyl, 2-benzoxazolyl, substituted 2-oxazolyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), (CH2)n(1 or 2-naphthyl), (CH2)n(substituted 1 or 2-naphthyl), (CH2)n(heteroaryl), (CH2)n(substituted heteroaryl), halomethyl, CO2R12, CONR13R14, CH2ZR15, CH2OCO(aryl), CH2OCO(heteroaryl), or CH2OPO(R16)R17, where Z is an oxygen or a sulfur atom, or B is a group of the Formula IIIa-c:

R1 is alkyl, cycloalkyl, substituted cycloalkyl, (cycloalkyl)alkyl, substituted (cycloalkyl)alkyl, phenyl, substituted phenyl, phenylalkyl, substituted phenylalkyl, naphthyl, substituted naphthyl, (1 or 2 naphthyl)alkyl, substituted (1 or 2 naphthyl)alkyl, heterocycle, substituted heterocycle, (heterocycle)alkyl, substituted (heterocycle)alkyl, R1a(R1b)N, or R1cO;

    • R1′ is hydrogen, alkyl, phenyl, substituted phenyl, naphthyl, substituted naphthyl, heterocycle or substituted heterocycle;
    • or R1 and R1′ taken together with the nitrogen atom to which they are attached form a heterocycle or substituted heterocycle;
    • R2 is hydrogen, lower alkyl, cycloalkyl, (cycloalkyl)alkyl, phenyl, substituted phenyl, phenylalkyl, substituted phenylalkyl, naphthyl, substituted naphthyl, (1 or 2 naphthyl)alkyl, or substituted (1 or 2 naphthyl)alkyl; and wherein:

R1a and R1b are independently hydrogen, alkyl, cycloalkyl, (cycloalkyl)alkyl, phenyl, substituted phenyl, phenylalkyl, substituted phenylalkyl, naphthyl, substituted naphthyl, (1 or 2 naphthyl)alkyl, substituted (1 or 2 naphthyl)alkyl, heteroaryl, substituted heteroaryl, (heteroaryl)alkyl, or substituted (heteroaryl)alkyl, with the proviso that R1a and R1b cannot both be hydrogen;

    • R1c is alkyl, cycloalkyl, (cycloalkyl)alkyl, phenyl, substituted phenyl, phenylalkyl, substituted phenylalkyl, naphthyl, substituted naphthyl, (1 or 2 naphthyl)alkyl, substituted (1 or 2 naphthyl)alkyl, heteroaryl, substituted heteroaryl, (heteroaryl)alkyl, or substituted (heteroaryl)alkyl;
    • R3 is C1-6 lower alkyl, cycloalkyl, phenyl, substituted phenyl, (CH2)nNH2, (CH2)nNHCOR9, (CH2)nN(C═NH)NH2, (CH2)mCO2R2, (CH2)mOR10, (CH2)mSR11, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), (CH2)n(1 or 2-naphthyl) or (CH2)n(heteroaryl), wherein heteroaryl includes pyridyl, thienyl, furyl, thiazolyl, imidazolyl, pyrazolyl, isoxazolyl, pyrazinyl, pyrimidyl, triazinyl, tetrazolyl, and indolyl;
    • R3a is hydrogen or methyl, or R3 and R3a taken together are —(CH2)d— where d is an interger from 2 to 6;
    • R4 is phenyl, substituted phenyl, (CH2)mphenyl, (CH2)m(substituted phenyl), cycloalkyl, or benzofused cycloalkyl;
    • R5 is hydrogen, lower alkyl, cycloalkyl, phenyl, substituted phenyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(1 or 2-naphthyl);
    • R6 is hydrogen, fluorine, oxo, lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), (CH2)n(1 or 2-naphthyl), OR10, SR11 or NHCOR9;
    • R7 is hydrogen, oxo (i.e., ═O), lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(1 or 2-naphthyl);
    • R8 is lower alkyl, cycloalkyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), (CH2)n(1 or 2-naphthyl), or COR9;
    • R9 is hydrogen, lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), (CH2)n(1 or 2-naphthyl), OR12, or NR13R14;
    • R10 is hydrogen, lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(1 or 2-naphthyl);
    • R11 is lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)nsubstituted phenyl), or (CH2)n(1 or 2-naphthyl);
    • R12 is lower alkyl, cycloalkyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(1 or 2-naphthyl);
    • R13 is hydrogen, lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, substituted naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(1 or 2-naphthyl);
    • R14 is hydrogen or lower alkyl;
    • or R13 and R14 taken together form a five to seven membered carbocyclic or heterocyclic ring, such as morpholine, or N-substituted piperazine;
    • R15 is phenyl, substituted phenyl, naphthyl, substituted naphthyl, heteroaryl, (CH2)nphenyl, (CH2)n(substituted phenyl), (CH2)n(1 or 2-naphthyl), or (CH2)n(heteroaryl);
    • R16 and R17 are independently lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, phenylalkyl, substituted phenylalkyl, or (cycloalkyl)alkyl;
    • R18 and R19 are independently hydrogen, alkyl, phenyl, substituted phenyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or R18 and R19 taken together are —(CH═CH)2—;
    • R20 is hydrogen, alkyl, phenyl, substituted phenyl, (CH2)nphenyl, (CH2)n(substituted phenyl);
    • R21, R22 and R23 are independently hydrogen, or alkyl;
    • X is CH2, (CH2)2, (CH2)3, or S;
    • Y1 is O or NR23;
    • Y2 is CH2, O, or NR23;
    • a is 0 or 1;
    • b is 1 or 2, provided that when a is 1 then b is 1;
    • c is 1 or 2, provided that when c is 1 then a is 0 and b is 1;
    • m is 1 or 2; and
    • n is 1, 2, 3 or 4;
    • or a pharmaceutically acceptable salt thereof.

As used herein, the term “alkyl” means a straight or branched C1 to C10 carbon chain, such as methyl, ethyl, tert-butyl, iso-propyl, n-octyl, and the like. The term “lower alkyl” means a straight chain or branched C1 to C6 carbon chain, such as methyl, ethyl, iso-propyl, and the like.

The term “cycloalkyl” means a mono-, bi-, or tricyclic ring that is either fully saturated, partially of fully unsaturated, or aromatic. Examples of such a ring include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, adamantyl, cyclooctyl, cis- or trans decalin, bicyclo[2.2.1]hept-2-ene, cyclohex-1-enyl, cyclopent-1-enyl, 1,4-cyclooctadienyl, and the like.

The term “(cycloalkyl)alkyl” means the above-defined alkyl group substituted with one of the above cycloalkyl rings. Examples of such a group include (cyclohexyl)methyl, 3-(cyclopropyl)-n-propyl, 5-(cyclopentyl)hexyl, 6-(adamantyl)hexyl, and the like.

The term “substituted phenyl” specifies a phenyl group substituted with one or more substituents chosen from halogen, hydroxy, protected hydroxy, cyano, nitro, trifluoromethyl, alkyl, alkoxy, acyl, acyloxy, carboxy, protected carboxy, carboxymethyl, protected carboxymethyl, hydroxymethyl, protected hydroxymethyl, amino, protected amino, (monosubstituted)amino, protected (monosubstituted)amino, (disubstituted)amino, carboxamide, protected carboxamide, N-(lower alkyl)carboxamide, protected N-(lower alkyl)carboxamide, N,N-di(lower alkyl)carboxamide, N-((lower alkyl)sulfonyl)amino, N-(phenylsulfonyl)amino, substituted or unsubstituted heterocycle, substituted or unsubstituted cycloalkyl, or by a substituted or unsubstituted phenyl group, such that in the latter case a biphenyl or naphthyl group results, or wherein two adjacent alkyl substituents on the substituted phenyl ring taken together form a cycloalkyl to yield, for example, tetrahydronaphthyl or indanyl.

Examples of the term “substituted phenyl” includes a mono-, di-, tri-, tetra- or penta(halo)phenyl group such as 2-, 3- or 4-chlorophenyl, 2,6-dichlorophenyl, 2,5-dichlorophenyl, 3,4-dichlorophenyl, 2-,3- or 4-bromophenyl, 3,4-dibromophenyl, 3-chloro-4-fluorophenyl, 2-, 3- or 4-fluorophenyl, 2,4,6-trifluorophenyl, 2,3,5,6-tetrafluorophenyl, 2,3,4,5-tetrafluorophenyl, 2,3,4,5,6-pentafluorophenyl, and the like; a mono or di(hydroxy)phenyl group such as 2-, 3-, or 4-hydroxyphenyl, 2,4-dihydroxyphenyl, the protected-hydroxy derivatives thereof and the like; a nitrophenyl group such as 2-, 3-, or 4-nitrophenyl; a cyanophenyl group, for example, 2-,3- or 4-cyanophenyl; a mono- or di(alkyl)phenyl group such as 2-, 3-, or 4-methylphenyl, 2,4-dimethylphenyl, 2-, 3- or 4-(iso-propyl)phenyl, 2-, 3-, or 4-ethylphenyl, 2-, 3- or 4-(n-propyl)phenyl and the like; a mono or di(alkoxy)phenyl group, for example, 2,6-dimethoxyphenyl, 2-, 3- or 4-(iso-propoxy)phenyl, 2-, 3- or 4-(t-butoxy)phenyl, 3-ethoxy-4-methoxyphenyl and the like; 2-, 3- or 4-trifluoromethylphenyl; a mono- or dicarboxyphenyl or (protected carboxy)phenyl group such as 2-, 3- or 4-carboxyphenyl or 2,4-di(protected carboxy)phenyl; a mono- or di(hydroxymethyl)phenyl or (protected hydroxymethyl)phenyl such as 2-, 3- or 4-(protected hydroxymethyl)phenyl or 3,4-di(hydroxymethyl)phenyl; a mono- or di(aminomethyl)phenyl or (protected aminomethyl)phenyl such as 2-, 3- or 4-(aminomethyl)phenyl or 2,4-(protected aminomethyl)phenyl; or a mono- or di(N-(methylsulfonylamino))phenyl such as 2, 3 or 4-(N-(methylsulfonylamino))phenyl. Also, the term “substituted phenyl” represents disubstituted phenyl groups wherein the substituents are different, for example, 3-methyl-4-hydroxyphenyl, 3-chloro-4-hydroxyphenyl, 2-methoxy-4-bromophenyl, 4-ethyl-2-hydroxyphenyl, 3-hydroxy-4-nitrophenyl, 2-hydroxy-4-chlorophenyl, and the like.

The term “phenylalkyl” means one of the above phenyl groups attached to one of the above-described alkyl groups, and the term “substituted phenylalkyl” means that either the phenyl or the alkyl, or both, are substituted with one or more of the above-defined substituents. Examples of such groups include 2-phenyl-1-chloroethyl, 2-(4′-methoxyphenyl)ethyl, 4-(2′,6′-dihydroxy phenyl)n-hexyl, 2-(5′-cyano-3′-methoxyphenyl)n-pentyl, 3-(2′,6′-dimethylphenyl)n-propyl, 4-chloro-3-aminobenzyl, 6-(4′-methoxyphenyl)-3-carboxy(n-hexyl), 5-(4′-aminomethylphenyl)-3-(aminomethyl)n-pentyl, 5-phenyl-3-oxo-n-pent-1-yl, (4-hydroxynapth-2-yl)methyl, and the like.

The term “substituted naphthyl” means a naphthyl group substituted with one or more of the above-identified substituents, and the term “(1 or 2 naphthyl)alkyl” means a naphthyl (1 or 2) attached to one of the above-described alkyl groups.

The terms “halo” and “halogen” refer to the fluoro, chloro, bromo or iodo groups. These terms may also be used to describe one or more halogens, which are the same or different. Preferred halogens in the context of this invention are chloro and fluoro.

The term “aryl” refers to aromatic five and six membered carbocyclic rings. Six membered rings are preferred.

The term “heterocycle” denotes optionally substituted five-membered or six-membered heterocyclic rings that have 1 to 4 heteroatoms, such as oxygen, sulfur and/or nitrogen atoms, in particular nitrogen, either alone or in conjunction with sulfur or oxygen ring atoms, and include aromatic heterocycles (also referred to herein as “heteroaryls”). The following ring systems are representative examples of aromatic heterocyclic radicals denoted by the term heteroaryl (whether substituted or unsubstituted): thienyl, furyl, pyrrolyl, pyrrolidinyl, imidazolyl, isoxazolyl, triazolyl, thiadiazolyl, oxadiazolyl, tetrazolyl, thiatriazolyl, oxatriazolyl, pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, oxazinyl, triazinyl, thiadiazinyl tetrazolo, 1,5-[b]pyridazinyl and purinyl, as well as benzo-fused derivatives, for example, benzoxazolyl, benzothiazolyl, benzimidazolyl and indolyl. Non-aromatic heterocycles include, for example, morpholinyl, pyrrolidinonyl, pyrrolidinyl, piperidinyl, piperazinyl, hydantoinyl, valerolactamyl, oxiranyl, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, tetrahydropyridinyl, tetrahydroprimidinyl, tetrahydrothiophenyl, tetrahydrothiopyranyl, tetrahydropyrimidinyl, tetrahydrothiophenyl, tetrahydrothiopyranyl, and the like.

Substituents for the above optionally substituted cycloalkyl or heterocycle rings are as listed above for substituted phenyl, and more specifically include from one to three halo, trihalomethyl, amino, protected amino, amino salts, mono-substituted amino, di-substituted amino, carboxy, protected carboxy, carboxylate salts, hydroxy, protected hydroxy, salts of a hydroxy group, lower alkoxy, lower alkylthio, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, (cycloalkyl)alkyl, substituted (cycloalkyl)alkyl, phenyl, substituted phenyl, phenylalkyl, and substituted phenylalkyl groups. More than one substituent may be made at any given atom of the heterocyclic ring, including carbocyclic or heterocyclic substituents that form a spiro union. “Trihalomethyl” can be trifluoromethyl, trichloromethyl, tribromomethyl or triiodomethyl, “lower alkoxy” means a C1 to C4 alkoxy group, similarly, “lower alkylthio” means a C1 to C4 alkylthio group. The term “substituted lower alkyl” means the above-defined lower alkyl group substituted from one to three times by a hydroxy, protected hydroxy, amino, protected amino, cyano, halo, trifluoromethyl, mono-substituted amino, di-substituted amino, lower alkoxy, lower alkylthio, carboxy, protected carboxy, or a carboxy, amino, and/or hydroxy salt.

The terms “substituted (cycloalkyl)alkyl” and “substituted cycloalkyl” are as defined above with regard to (cycloalkyl)alkyl and cycloalkyl, but substituted with one or more substituents as identified above with regard to substituted phenyl, cycloalkyl and/or heterocycle. The term “(monosubstituted)amino” refers to an amino group with one substituent chosen from the group consisting of phenyl, substituted phenyl, alkyl, substituted alkyl, C1 to C7 acyl, C2 to C7 alkenyl, C2 to C7 substituted alkenyl, C2 to C7 alkynyl, C7 to C16 alkylaryl, C7 to C16 substituted alkylaryl and heteroaryl group. The (monosubstituted)amino can additionally have an amino-protecting group as encompassed by the term “protected (monosubstituted)amino.” The term “(disubstituted)amino” refers to amino groups with two substituents chosen from the group consisting of phenyl, substituted phenyl, alkyl, substituted alkyl, C1 to C7 acyl, C2 to C7 alkenyl, C2 to C7 alkynyl, C7 to C16 alkylaryl, C7 to C16 substituted alkylaryl and heteroaryl. The two substituents can be the same or different. The term “heteroaryl(alkyl)” denotes an alkyl group as defined above, substituted at any position by a heteroaryl group, as above defined.

More specifically, and in addition to the substituents disclosed above, the term “substituted” as used herein means a chemical moiety wherein at least one hydrogen atom is replaced with a substituent. In the case of a keto substituent (“C(═O)”) two hydrogen atoms are replaced. Substituents include halogen, hydroxy, alkyl, substituted alkyl (such as haloalkyl, mono- or di-substituted aminoalkyl, alkyloxyalkyl, and the like), aryl, substituted aryl, arylalkyl, substituted arylalkyl, heterocycle, substituted heterocycle, heterocyclealkyl, substituted heterocyclealkyl, —NRaRb, —NRaC(═O)Rb, —NRaC(═O)NRaRb, —NRaC(═O)ORb —NRaSO2Rb, —ORa, —C(═O)Ra, —C(═O)ORa, —C(═O)NRaRb, —OC(═O)Ra, —OC(═O)ORa, —OC(═O)NRaRb, —NRaSO2Rb, or a radical of the formula —Y-Z-Ra where Y is alkanediyl, substitute alkanediyl, or a direct bond, Z is —O—, —S—, —S(═O)—, —S(═O)2—, —N(Rb)—, —C(═O)—, —C(═O)O—, —OC(═O)—, —N(Rb)C(═O)—, —C(═O)N(Rb)- or a direct bond, wherein Ra and Rb are the same or different and independently hydrogen, amino, alkyl, substituted alkyl (including halogenated alkyl), aryl, substituted aryl, arylalkyl, substituted arylalkyl, heterocycle, substituted heterocycle, heterocylealkyl or substituted heterocyclealkyl, or wherein Ra and Rb taken together with the nitrogen atom to which they are attached form a heterocycle or substituted heterocycle.

Furthermore, the above optionally substituted five-membered or six-membered heterocyclic rings, and the above cycloalkyl rings, can optionally be fused to an aromatic 5-membered or 6-membered aryl, carbocyclic or heterocyclic ring system. For example, the rings can be optionally fused to an aromatic 5-membered or 6-membered ring system such as a pyridine or a triazole system, and preferably to a benzene ring.

The term “pharmaceutically-acceptable salt” encompasses those salts that form with the carboxylate anions and includes salts formed with the organic and inorganic cations such as those chosen from the alkali and alkaline earth metals, (for example, lithium, sodium, potassium, magnesium, barium and calcium); and ammonium ion; and the organic cations (for example, dibenzylammonium, benzylammonium, 2-hydroxyethylammonium, bis(2-hydroxyethyl)ammonium, phenylethylbenzyl-ammonium, dibenzylethylenediammonium, and like cations.) Other cations encompassed by the above term include the protonated form of procaine, quinine and N-methylglucosamine, the protonated forms of basic amino acids such as glycine, ornithine, histidine, phenylglycine, lysine, and arginine. Furthermore, any zwitterionic form of the instant compounds formed by a carboxylic acid and an amino group is referred to by this term. A preferred cation for the carboxylate anion is the sodium cation. Furthermore, the term includes salts that form by standard acid-base reactions with basic groups (such as amino groups) and includes organic or inorganic acids. Such acids include hydrochloric, sulfuric, phosphoric, acetic, succinic, citric, lactic, maleic, fumaric, palmitic, cholic, pamoic, mucic, D-glutamic, D-camphoric, glutaric, phthalic, tartaric, lauric, stearic, salicyclic, methanesulfonic, benzenesulfonic, sorbic, picric, benzoic, cinnamic, and the like acids.

The compounds of Formula I may also exist as solvates and hydrates. Thus, these compounds may crystallize with, for example, waters of hydration, or one, a number of, or any fraction thereof of molecules of the mother liquor solvent. The solvates and hydrates of such compounds are included within the scope of this invention.

The term “carboxy-protecting group” as used herein refers to one of the ester derivatives of the carboxylic acid group commonly employed to block or protect the carboxylic acid group while reactions are carried out on other functional groups on the compound. Examples of such carboxylic acid protecting groups include t-butyl, 4-nitrobenzyl, 4-methoxybenzyl, 3,4-dimethoxybenzyl, 2,4-dimethoxybenzyl, 2,4,6-trimethoxybenzyl, 2,4,6-trimethylbenzyl, pentamethylbenzyl, 3,4-methylenedioxybenzyl, benzhydryl, 4,4′-dimethoxytrityl, 4,4′,4″-trimethoxytrityl, 2-phenylpropyl, trimethylsilyl, t-butyldimethylsilyl, phenacyl, 2,2,2-trichloroethyl, β-(trimethylsilyl)ethyl, β-(di(n-butyl)methylsilyl)ethyl, p-toluenesulfonylethyl, 4-nitrobenzylsulfonylethyl, allyl, cinnamyl, 1-(trimethylsilylmethyl)-propenyl and like moieties. The species of carboxy-protecting group employed is not critical so long as the derivatized carboxylic acid is stable to the conditions of subsequent reaction(s) and can be removed at the appropriate point without disrupting the remainder of the molecule. Further examples of these groups are found in C. B. Reese and E. Haslam, “Protective Groups in Organic Chemistry,” J. G. W McOmie, Ed., Plenum Press, New York, N.Y., 1973, Chapter 5, respectively, and T. W. Greene and P. G. M. Wuts, “Protective Groups in Organic Synthesis,” 2nd ed., John Wiley and Sons, New York, N.Y., 1991, Chapter 5, each of which is incorporated herein by reference. A related term is “protected carboxy,” which refers to a carboxy group substituted with one of the above carboxy-protecting groups.

The term “hydroxy-protecting group” refers to readily cleavable groups bonded to hydroxyl groups, such as the tetrahydropyranyl, 2-methoxyprop-2-yl, 1-ethoxyeth-1-yl, methoxymethyl, β-methoxyethoxymethyl, methylthiomethyl, t-butyl, t-amyl, trityl, 4-methoxytrityl, 4,4′-dimethoxytrityl, 4,4′,4″-trimethoxytrityl, benzyl, allyl, trimethylsilyl, (t-butyl)dimethylsilyl, 2,2,2-trichloroethoxycarbonyl, and the like.

Further examples of hydroxy-protecting groups are described by C. B. Reese and E. Haslam, “Protective Groups in Organic Chemistry,” J. G. W. McOmie, Ed., Plenum Press, New York, N.Y., 1973, Chapters 3 and 4, respectively, and T. W. Greene and P. G. M. Wuts, “Protective Groups in Organic Synthesis,” Second Edition, John Wiley and Sons, New York, N.Y., 1991, Chapters 2 and 3. A preferred hydroxy-protecting group is the tert-butyl group. The related term “protected hydroxy” denotes a hydroxy group bonded to one of the above hydroxy-protecting groups.

The term “amino-protecting group” as used herein refers to substituents of the amino group commonly employed to block or protect the amino functionality while reacting other functional groups of the molecule. The term “protected (monosubstituted)amino” means there is an amino-protecting group on the monosubstituted amino nitrogen atom.

Examples of such amino-protecting groups include the formyl (“For”) group, the trityl group, the phthalimido group, the trichloroacetyl group, the trifluoroacetyl group, the chloroacetyl, bromoacetyl, and iodoacetyl groups, urethane-type protecting groups, such as t-butoxycarbonyl (“Boc”), 2-(4-biphenylyl)propyl-2-oxycarbonyl (“Bpoc”), 2-phenylpropyl-2-oxycarbonyl (“Poc”), 2-(4-xenyl)isopropoxycarbonyl, 1,1-diphenylethyl-1-oxycarbonyl, 1,1-diphenylpropyl-1-oxycarbonyl, 2-(3,5-dimethoxyphenyl)propyl-2-oxycarbonyl (“Ddz”), 2-(p-toluyl)propyl-2-oxycarbonyl, cyclopentanyloxycarbonyl, 1-methylcyclopentanyl-oxycarbonyl, cyclohexanyloxy-carbonyl, 1-methyl-cyclohexanyloxy-carbonyl, 2-methylcyclohexanyl-oxycarbonyl, 2-(4-toluylsulfonyl)ethoxycarbonyl, 2-(methylsulfonyl)ethoxycarbonyl, 2-(triphenylphosphino)-ethoxycarbonyl, 9-fluorenyl-methoxycarbonyl (“Fmoc”), 2-(trimethylsilyl)ethoxycarbonyl, allyloxycarbonyl, 1-(trimethylsilylmethyl)prop-1-enyloxycarbonyl, 5-benzisoxalylmethoxycarbonyl, 4-acetoxybenzyl-oxycarbonyl, 2,2,2-trichloroethoxycarbonyl, 2-ethynyl-2-propoxycarbonyl, cyclopropylmethoxycarbonyl, isobornyloxycarbonyl, 1-piperidyloxycarbonyl, benzyl-oxycarbonyl (“Cbz”), 4-phenylbenzyloxycarbonyl, 2-methylbenzyloxycarbonyl, α-2,4,5,-tetramethylbenzyl-oxycarbonyl (“Tmz”), 4-methoxybenzyloxycarbonyl, 4-fluorobenzyl-oxycarbonyl, 4-chlorobenzyloxycarbonyl, 3-chlorobenzyloxycarbonyl, 2-chlorobenzyloxy-carbonyl, 2,4-dichlorobenzyloxycarbonyl, 4-bromobenzyloxycarbonyl, 3-bromobenzyloxy-carbonyl, 4-nitrobenzyloxycarbonyl, 4-cyanobenzyloxycarbonyl, 4-(decyloxy)benzyloxy-carbonyl and the like; the benzoylmethylsulfonyl group, the 2,2,5,7,8-pentamethylchroman-6-sulfonyl group (“PMC”), the dithiasuccinoyl (“Dts”) group, the 2-(nitro)phenyl-sulfenyl group (“Nps”), the diphenylphosphine oxide group, and like amino-protecting groups. The species of amino-protecting group employed is not critical so long as the derivatized amino group is stable to the conditions of the subsequent reaction(s) and can be removed at the appropriate point without disrupting the remainder of the molecule. Preferred amino-protecting groups are Boc, Cbz and Fmoc. Further examples of amino-protecting groups embraced by the above term are well known in organic synthesis and the peptide art and are described by, for example, T. W Greene and P. GM. Wuts, “Protective Groups in Organic Synthesis,” 2nd ed., John Wiley and Sons, New York, N.Y., 1991, Chapter 7, M. Bodanzsky, “Principles of Peptide Synthesis,” 1st and 2nd revised Ed., Springer-Verlag, New York, N.Y., 1984 and 1993, and J. M. Stewart and J. D. Young, “Solid Phase Peptide Synthesis,” 2nd Ed., Pierce Chemical Co., Rockford, Ill., 1984, E. Atherton and R. C. Shephard, “Solid Phase Peptide Synthesis—A Practical Approach” IRL Press, Oxford, England (1989), each of which is incorporated herein by reference. The related term “protected amino” defines an amino group substituted with an amino-protecting group discussed above.

The terms “natural and unnatural amino acid” refers to both the naturally occurring amino acids and other non-proteinogenic α-amino acids commonly utilized by those in the peptide chemistry arts when preparing synthetic analogues of naturally occurring peptides, including D and L forms. The naturally occurring amino acids are glycine, alanine, valine, leucine, isoleucine, serine, methionine, threonine, phenylalanine, tyrosine, tryptophan, cysteine, proline, histidine, aspartic acid, asparagine, glutamic acid, glutamine, γ-carboxyglutamic acid, arginine, ornithine and lysine. Examples of unnatural alpha-amino acids include hydroxylysine, citrulline, kynurenine, (4-aminophenyl)alanine, 3-(2′-naphthyl)alanine, 3-(1′-naphthyl)alanine, methionine sulfone, (t-butyl)alanine, (t-butyl)glycine, 4-hydroxyphenyl-glycine, aminoalanine, phenylglycine, vinylalanine, propargyl-gylcine, 1,2,4-triazolo-3-alanine, thyronine, 6-hydroxytryptophan, 5-hydroxytryptophan, 3-hydroxy-kynurenine, 3-aminotyrosine, trifluoromethylalanine, 2-thienylalanine, (2-(4-pyridyl)ethyl)cysteine, 3,4-dimethoxy-phenylalanine, 3-(2′-thiazolyl)alanine, ibotenic acid, 1-amino-1-cyclopentane-carboxylic acid, 1-amino-1-cyclohexanecarboxylic acid, quisqualic acid, 3-(trifluoromethylphenyl)alanine, (cyclohexyl)glycine, thiohistidine, 3-methoxytyrosine, norleucine, norvaline, alloisoleucine, hom*oarginine, thioproline, dehydro-proline, hydroxyproline, hom*oproline, indoline-2-carboxylic acid, 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, 1,2,3,4-tetrahydroquinoline-2-carboxylic acid, α-amino-n-butyric acid, cyclohexylalanine, 2-amino-3-phenylbutyric acid, phenylalanine substituted at the ortho, meta, or para position of the phenyl moiety with one or two of the following groups: a (C1 to C4)alkyl, a (C, to C4)alkoxy, a halogen or a nitro group, or substituted once with a methylenedioxy group; β2- and 3-thienylalanine; β-2- and 3-furanylalanine; β-2-, 3- and 4-pyridylalanine; β-(benzothienyl-2- and 3-yl)alanine; β-(1- and 2-naphthyl)alanine; O-alkylated derivatives of serine, threonine or tyrosine; S-alkylated cysteine, S-alkylated hom*ocysteine, the O-sulfate, O-phosphate and O-carboxylate esters of tyrosine; 3-(sulfo)tyrosine, 3-(carboxy)tyrosine, 3-(phospho)tyrosine, the 4-methane-sulfonic acid ester of tyrosine, 4-methanephosphonic acid ester of tyrosine, 3,5-diiodotyrosine, 3-nitrotyrosine, ε-alkyllysine, and delta-alkyl ornithine. Any of these α-amino acids may be substituted with a methyl group at the alpha position, a halogen at any position of the aromatic residue on the α-amino side chain, or an appropriate protective group at the O, N, or S atoms of the side chain residues. Appropriate protective groups are discussed above.

Depending on the choice of solvent and other conditions known to the practitioner skilled in the art, compounds of this invention may also take the ketal or acetal form, which forms are included in the instant invention. In particular, when R2 is hydrogen compounds of Formula Ia may exist in the cyclic ketal or acetal form Formula Ia′ shown below:
Similarly, when R2 of Formula I is a moiety other than hydrogen, and depending upon the choice of solvents as noted above (e.g., R2OH), the compounds of the cyclic ketal or acetal form include compounds having Formula Ia″ as shown below.

In addition, it should be understood that the equilibrium forms of the compounds of this invention may include tautomeric forms. All such forms of these compounds are expressly included in the present invention.

The compounds of this invention may be modified by appropriate functionalities to enhance selective biological properties. Such modifications are known in the art and include those which increase biological penetration into a given biological system (e.g., blood, lymphatic system, central nervous system), increase oral availability, increase solubility to allow administration by injection, alter metabolism and alter rate of exertion. In addition, the compounds may be altered to pro-drug form such that the desired compound is created in the body of the patient as the result of the action of metabolic or other biochemical processes on the pro-drug. Some examples of pro-drug forms include ketal, acetal, oxime, and hydrazone forms of compounds which contain ketone or aldehyde groups, especially where they occur in the group donated as “A” in Formula I or the modified aspartic acid residue attached to the group denoted as “A”.

Compounds of this invention with respect to the group “R1” in Formula I, include those wherein:

    • R1 is phenyl, substituted phenyl, phenylalkyl, substituted phenylalkyl, naphthyl, substituted naphthyl, (1 or 2 naphthyl)alkyl, heteroaryl, or (heteroaryl)alkyl.

More typically, the compounds of this invention with respect to the group “R1” include those wherein:

    • R1 is phenyl, substituted phenyl, phenylalkyl, substituted phenylalkyl, naphthyl, substituted naphthyl, or (1 or 2 naphthyl)alkyl.

Compounds of this invention with respect to the group “R1 “include those wherein:

    • R1′ is hydrogen, lower alkyl and aryl.

Compounds of this invention with respect to the group “A” in Formula I, include those of Formula IIa wherein:

R3 is lower alkyl, cycloalkyl, phenyl, substituted phenyl, (CH2)nNH2, (CH2)mOR10, (CH2)mSR11, (CH2)ncycloalkyl,(CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(1 or 2-naphthyl);

    • R3a is hydrogen;
    • R10 is hydrogen, lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(1 or 2-naphthyl);
    • R11 is lower alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(1 or 2-naphthyl); and
    • n=1-4 and m=1 or 2.

Compounds of this invention with respect to the group “A” in Formula I, also include those of Formula IIb wherein:

    • R4 is phenyl, substituted phenyl, (CH2)mphenyl, (CH2)m(substituted phenyl), cycloalkyl, or 2-indanyl; and
    • m=1 or 2.

Another group of compounds with respect to the group “A” in Formula I, include those of Formula IId wherein:

    • R6 is hydrogen, fluorine, cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), (CH2)n(l or 2-naphthyl), OR10, or SR11;
    • R10 and R11 are independently cycloalkyl, phenyl, substituted phenyl, naphthyl, (CH2)ncycloalkyl, (CH2)nphenyl, (CH2)n(substituted phenyl), or (CH2)n(l or 2-naphthyl); and
    • n=1-4.

A fourth group of compounds with respect to the group “A” in Formula I, include those of Formula IIe wherein:

    • R7 is hydrogen, oxo, cycloalkyl, phenyl, substituted phenyl, or naphthyl; and
    • X=CH2, (CH2)2, (CH2)3, or S.

Another group of compounds with respect to the group “A” in Formula I, include those of Formula IIh wherein:

    • a=0 and b=1 or 2.

Compounds of this invention with respect to the group “B” in Formula I, include those wherein:

    • B is hydrogen, 2-benzoxazolyl, substituted 2-oxazolyl, CH2ZR15, CH2OCO(aryl), or CH2OPO(R16)R17, where Z is an oxygen or a sulfur atom;
    • R15 is phenyl, substituted phenyl, naphthyl, substituted naphthyl, heteroaryl, (CH2)nphenyl, (CH2)n(substituted phenyl), (CH2)n(1 or 2-naphthyl), or (CH2)n(heteroaryl);
    • R16 and R17 are independently alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, phenylalkyl, substituted phenylalkyl, or (cycloalkyl)alkyl.

Another group of compounds with respect to the group “B” in Formula I, include those of Formula IIIa-c wherein:

Y1 is O or NR23;

    • Y2 is CH2, O, or NR23;
    • R18 and R19 are independently hydrogen, alkyl, or phenyl, or R18 and R19 taken together are —(CH═CH)2—;
    • R20 is hydrogen, alkyl, phenyl, substituted phenyl, (CH2)nphenyl, or (CH2)n(substituted phenyl);
    • R21, R22 and R23 are independently hydrogen or alkyl.

The compounds of Formula I may be synthesized using conventional techniques as discussed below. Advantageously, these compounds are conveniently synthesized from readily available starting materials.

One synthetic route for synthesizing the instant compounds is set forth in the following Scheme 1:

In the above Scheme 1, Formula (V), that is H2N—C, is a modified aspartic acid residue of Formulas Va through Vd:

In the above Scheme 1, “PG” stands for an amino protecting group and “A”stands for a natural or unnatural amino acid of formula IIa through IIi, as discussed above. In Formula Va through Vd, R2′ is a carboxyl protecting group as described above or an R2 moiety as set forth in the definition of R2 in Formula I, with the exception that R2′ cannot be a hydrogen atom.

The modified aspartic acids of Formula Va-d can be prepared by methods well known in the art. See, for example, European Patent Application 519,748; PCT Patent Application No. PCT/EP92/02472; PCT Patent Application No. PCT/US91/06595; PCT Patent Application No. PCT/US91/02339; European Patent Application No. 623,592; World Patent Application No. WO 93/09135; PCT Patent Application No. PCT/US94/08868; European Patent Application No. 623,606; European Patent Application No. 618,223; European Patent Application No. 533,226; European Patent Application No. 528,487; European Patent Application No. 618,233; PCT Patent Application No. PCT/EP92/02472; World Patent Application No. WO 93/09135; PCT Patent Application No. PCT/US93/03589; and PCT Patent Application No. PCT/US93/00481, all of which are herein incorporated by reference.

The coupling reactions carried out under Step A are performed in the presence of a standard peptide coupling agent such as the combination of the combination of dicyclohexylcarbodiimide(DCC) and 1-hydroxy-benzotriazole(HOBt), as well as the BOP (benzotriazolyloxy-tris-(dimethylamino)phosphonium hexafluorophosphate) reagent, pyBOP (benzotriazolyloxy-tris(N-pyrolidinyl)phosphoniumhexafluorophosphate), HBTU (O-benzotriazolyly-tetramethylisouronium-hexafluorophosphate), and EEDQ (1-ethyloxycarbonyl-2-ethyloxy-1,2-dihydroquinoline) reagents, the combination of 1-ethyl(3,3′-dimethyl-1′-aminopropyl)carbodiimide (EDAC) and HOBt, and the like, as discussed in J. Jones, “Amino Acid and Peptide Synthesis,” Steven G. Davis ed., Oxford University Press, Oxford, pp. 25-41 (1992); M. Bodanzky, “Principles of Peptide Synthesis,” Hafner et al. ed., Springer-Verlag, Berlin Heidelberg, pp. 9-52 and pp. 202-251 (1984); M. Bodanzky, “Peptide Chemistry, A Practical Textbook,” Springer-Verlag, Berlin Heidelberg, pp. 55-73 and pp. 129-180; and Stewart and Young, “Solid Phase Peptide Synthesis,” Pierce Chemical Company, (1984), all of which are herein incorporated by reference. The amino protecting group is then removed and the resulting amine is coupled to the (N-substituted)oxamic acid of Formula VII (Step B). Again, this coupling reaction uses the standard peptide coupling reactions mentioned above.

Alternatively, the (N-substituted)oxamic acid of Formula VII can be coupled to an amino ester of Formula IX (Step D). Again, this coupling reaction uses the standard peptide coupling reactions mentioned above. In Formula IX, the group R is a carboxyl protecting group such as methyl, allyl, benzyl or tert-butyl. After removal of the carboxyl protecting group under standard conditions well known in the art, the resulting carboxylic acid is coupled to amine V using the standard peptide coupling methods described above (Step E).

In the case where the coupling reaction depicted by either Step A or Step E was carried out with the amino alcohol of Formula Vc, the alcohol moiety must be oxidized to the corresponding carbonyl compound prior to removal of the protecting groups. Preferred methods for the oxidation reaction include Swern oxidation (oxalyl chloride-dimethyl sulfoxide, methylene chloride at −78° C. followed by triethylamine); and Dess-Martin oxidation (Dess-Martin periodinane, t-butanol, and methylene chloride.) The protecting groups contained in substructures of the Formula Va-d and A (if present) are removed by methods well known in the art. These reactions and removal of some or all of the protecting groups are involved in Step C in the above Scheme 1.

An alternative synthetic route for synthesizing the instant compounds is set forth in the following Scheme 2:

In the above Scheme 2, “PG” stands for an amino protecting group and “A” stands for a natural or unnatural amino acid of formula IIa through IIi, as discussed above. The group R is a carboxyl protecting group such as trimethylsilyl, methyl, allyl, benzyl or tert-butyl.

The coupling reactions carried out under Step F and Step G are performed in the presence of a standard peptide coupling agent as discussed above. In Step G, the amino protecting group must be removed prior to the coupling step. In Step H the alpha-carboxy protecting group R of the compound of Formula XIII is selectively removed and the resulting mono-carboxylic acid treated sequentially with diazomethane and hydrobromic acid to give the alpha-bromoketone of Formula XIV.

In Step I, the bromoketone of Formula XIV is treated with either R15Z-H, (aryl)-CO2H, (heteroaryl)-CO2H, or R16(R7)PO2H in the presence of an inorganic base such as potassium carbonate or potassium fluoride in an inert solvent such as dimethyl formamide to give the corresponding compound of Formula I in which B is CH2ZR15, CH2OCO(aryl), CH2OCO(heteroaryl), or CH2OPO(R16)R17, respectively. Compounds of Formula I in which B is a fragment of Formula III may also be prepared in a similar fashion. The protecting groups contained in substructures of the Formula XI and A are removed by methods well known in the art. These reactions and removal of some or all of the protecting groups are involved in Step I in the above Scheme 2.

An alternative method for the preparation of compounds of the instant invention of Formula I in which R2 and B are both hydrogen (i.e., Formula Ib) is set forth below in Scheme 3:

In Scheme 3, Fmoc is the amino protecting group 9-fluorenylmethoxycarbonyl and the shaded circle labeled “PS” represents polystryene resin.

The coupling of the acid of Formula XV to a primary amine on solid support, preferably aminomethyl polystyrene, is carried out using standard peptide coupling agents, preferably using benzotriazolyloxy-tris(N-pyrolidinyl)phosphoniumhexafluorophosphate (pyBOP) in a inert solvent such as dimethylformamide or N-methylpyrrolidone (Step J). After removal of the Fmoc protecting group of XVI by treatment with pyrrolidine-dimethylformamide, the resulting amine is coupled to Fmoc-amino acid of Formula IVa using standard peptide coupling conditions as discussed above (Step K).

In Step L the Fmoc protecting group of the compound of Formula XVII is removed again by treatment with pyrrolidine-dimethylformamide and the resulting amine coupled to the (N-substituted)oxamic acid of Formula VII again using standard peptide coupling conditions as discussed above. The tert-butyl ester of the compound of Formula XVIII is removed by treatment with trifluoroacetic acid-methylene chloride in the presence of a trapping agent such as anisole and the resulting acid cleaved from the solid support by treatment with 37% aqueous formaldehyde/acetic acid/tetrahydrofuran/trifluoroacetic acid, preferably in a ratio of 1/1/5/0.025, to give the aspartyl aldehyde of Formula Ib (Step M).

Pharmaceutical compositions of this invention comprise any of the compounds of the present invention, and pharmaceutically acceptable salts thereof, with any pharmaceutically acceptable carrier, adjuvant or vehicle (hereinafter collectively referred to as “pharmaceutically-acceptable carriers”). Pharmaceutically acceptable carriers, adjuvants and vehicles that may be used in the pharmaceutical compositions of this invention include, but are not limited to, ion exchange, alumina, aluminum stearate, lecithin, serum proteins, such as human serum albumin; buffer substances such as the various phosphates, glycine, sorbic acid, potassium sorbate, partial glyceride mixtures of saturated vegetable fatty acids; water, salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, and zinc salts; colloidal silica, magnesium trisilicate, polyvinyl pyrrolidone, cellulose-based substances, polyethylene glycol, sodium carboxymethylcellulose, polyarylates, waxes, polyethylene-polyoxypropylene-block polymers, polyethylene glycol and wool fat, and the like.

The pharmaceutical compositions of this invention may be administered orally, parenterally, by inhalation spray, topically, rectally, nasally, buccally, vagin*lly or by an implanted reservoir. Oral and parenteral administration are preferred. The term “parenteral” as used herein includes subcutaneous, intracutaneous, intravenous, intramuscular, intra-articular, intrasynovial, intrasternal, intrathecal, intralesional and intracranial injection or infusion techniques.

The pharmaceutical compositions may be in the form of a sterile injectable preparation, for example, as a sterile injectable aqueous or oleaginous suspension. This suspension may be formulated according to techniques known in the art using suitable dispersing or wetting agents (such as, for example, Tween 80) and suspending agents. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally-acceptable diluent or solvent, for example, as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are mannitol, water, Ringer's solution and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose, any bland fixed oil may be employed including synthetic mono- or diglycerides. Fatty acids, such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically-acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions. These oil solutions or suspensions may also contain a long-chain alcohol diluent or dispersant.

The pharmaceutical compositions of this invention may be orally administered in any orally acceptable dosage form including, but not limited to, capsules, tablets, and aqueous suspensions and solutions. In the case of tablets for oral use, carrier which are commonly used include lactose and corn starch. Lubricating agents, such as magnesium stearate, are also typically added. For oral administration in capsule form useful diluents include lactose and dried corn starch. When aqueous suspensions are administered orally, the active ingredient is combined with emulsifying and suspending agents. If desired, certain sweetening and/or flavoring and/or coloring agents may be added.

The pharmaceutical compositions of this invention may also be administered in the form of suppositories for rectal administration. These compositions can be prepared by mixing a compound of this invention with a suitable nonirritating excipient which is solid at room temperature but liquid at the rectal temperature. Such materials include, but are not limited to, cocoa butter, beeswax and polyethylene glycols.

Topical administration of the pharmaceutical compositions of this invention is especially useful when the desired treatment involves areas or organs readily accessible to topical application. For application topically to the skin, the pharmaceutical composition should be formulated with a suitable ointment containing the active components suspended or dissolved in a carrier. Carriers for topical administration of the compounds of this invention include, but are not limited to, mineral oil, liquid petroleum, white petroleum, propylene glycol, polyoxyethylene, polyoxypropylene compound, emulsifying wax and water. Alternatively, the pharmaceutical composition can be formulated with a suitable lotion or cream containing the active compound suspended or dissolved in a carrier. Suitable carriers include, but are not limited to, mineral oil, sorbitan monostearate, polysorbate 60, cetyl esters wax, cetearyl alcohol, 2-octyldodecanol, benzyl alcohol and water. The pharmaceutical compositions of this invention may also be topically applied to the lower intestinal tract by rectal suppository formulation or in a suitable enema formulation. Topically-applied transdermal patches are also included in this invention.

The pharmaceutical compositions of this invention may be administered by nasal aerosol or inhalation. Such compositions are prepared according to techniques well-known in the art of pharmaceutical formulation and may be prepared as solutions in saline, employing benzyl alcohol or other suitable preservatives, absorption promoters to enhance bioavailability, fluorocarbons, and/or other solubilizing or dispersing agents known in the art.

The compounds of this invention may be used in combination with either conventional anti-inflammatory agents or with matrix metalloprotease inhibitors, lipoxygenase inhibitors and antagonists of cytokines other than IL-1β.

The compounds of this invention can also be administered in combination with immunomodulators (e.g., bropirimine, anti-human alpha interferon antibody, IL-2, GM-CSF, methionine enkephalin, interferon alpha, diethyldithiocarbamate, tumor necrosis factor, naltrexons and rEPO) or with prostaglandins, to prevent or combat IL-1-mediated disease symptoms such as inflammation.

When the compounds of this invention are administered in combination therapies with other agents, they may be administered sequentially or concurrently to the patient. Alternatively, pharmaceutical compositions according to this invention may be comprised of a combination of a compound of Formula I and another therapeutic or prophylactic agent mentioned above.

The disease states which may be treated or prevented by the instant pharmaceutical compositions include, but are not limited to, inflammatory diseases, autoimmune diseases and neurodegenerative diseases, and for inhibiting unwanted apoptosis involved in ischemic injury, such as ischemic injury to the heart (e.g., myocardial infarction), brain (e.g., stroke), and kidney (e.g., ischemic kidney disease). As a consequence of their ability to inhibit apoptosis, the present pharmaceutical compositions are also useful for the repopulation of hematopoietic cells of a patient following chemotherapy. Methods of administering an effective amount of the above-described pharmaceutical compositions to mammals, also referred to herein as patients, in need of such treatment (that is, those suffering from inflammatory diseases, autoimmune diseases, neurodegenerative diseases and for the repopulation of hematopoietic cells in cancer patients who have undergone chemotherapy) are another aspect of the instant invention. Finally, as a further consequence of their ability to inhibit apoptosis, the instant pharmaceutical compositions may be used in a method to prolong the viability of organs to be used in transplantations.

Inflammatory disease which may be treated or prevented include, for example, septic shock, septicemia, and adult respiratory distress syndrome. Target autoimmune diseases include, for example, rheumatoid, arthritis, systemic lupus erythematosus, scleroderma, chronic thyroiditis, Graves' disease, autoimmune gastritis, insulin-dependent diabetes mellitus, autoimmune hemolytic anemia, autoimmune neutropenia, thrombocytopenia, chronic active hepatitis, myasthenia gravis and multiple sclerosis. Target neurodegenerative diseases include, for example, amyotrophic lateral sclerosis, Alzheimer's disease, Parkinson's disease, and primary lateral sclerosis. The pharmaceutical compositions of this invention may also be used to promote wound healing. Target diseases associated with harmful, apoptosis, in other words, those associated with ischemic injury, includes myocardial infarction, stroke, and ischemic kidney disease. The pharmaceutical compositions of this invention may also be used to treat infectious diseases, especially those involved with viral infections.

The term “effective amount” refers to dosage levels of the order of from about 0.05 milligrams to about 140 milligrams per kilogram of body weight per day for use in the treatment of the above-indicated conditions (typically about 2.5 milligrams to about 7 grams per patient per day). For example, inflammation may be effectively treated by the administration of from about 0.01 to 50 milligrams of the compound per kilogram of body weight per day (about 0.5 milligrams to about 3.5 grams per patient per day).

The amount of the compounds of Formula I that may be combined with the carrier materials to produce a single dosage form will vary depending upon the host treated and the particular mode of administration. For example, a formulation intended for the oral administration of humans may contain from 0.5 milligrams to 5 grams of a compound of Formula I combined with an appropriate and convenient amount of a pharmaceutically-acceptable carrier which may vary from about 5 to about 95 percent of the total composition. Dosage unit forms will generally contain between from about 1 milligram to about 500 milligrams of an active compound of Formula I.

It will be understood, however, that the specific “effective amount” for any particular patient will depend upon a variety of factors including the activity of the specific compound employed, the age, body weight, general health, sex, diet, time of administration, route of administration, rate of excretion, drug combination and the severity of the particular disease undergoing prevention or therapy.

Although this invention focuses on the use of the compounds disclosed herein for preventing and treating IL-1-mediated diseases, the compounds of this invention can also be used as inhibitory agents for other cysteine proteases.

The compounds of this invention are also useful as commercial reagents which effectively bind to the ICE/ced-3 family of cysteine protease or other cysteine proteases. As commercial reagents, the compounds of this invention, and their derivatives, may be used to block proteolysis of a target peptide or may be derivatized to bind to a stable resin as a tethered substrate for affinity chromatography applications. These and other uses which characterize commercial cystine protease inhibitors will be evident to those of ordinary skill in the art.

In order that this invention be more fully understood, the following examples are set forth. These examples are for the purpose of illustration only and are not to be construed as limiting the scope of the invention in any way. In the following Examples, proton NMR spectra were obtained at 300 MHz; chemical shifts are quoted downfield from internal tetramethylsilane.

PREPARATION 1

PREPARATION OF (3S)-AMINO-4-OXOBUTANOIC ACID (TERT)-BUTYL ESTER SEMICARBAZONE, P-TOLUENESULFONATE SALT

Part A: N-(Benzyloxycarbonyl)-L-(N′-Methyl-N′-Methoxy)aspartamide β-(tert-Butyl) Ester

To a solution of N-(benzyloxycarbonyl)-L-aspartic acid-β-(tert-butyl)ester (14.65 g, 45.3 mmol, Bachem) in CH2Cl2 (150 mL) at 0° C. (ice bath) under a nitrogen atmosphere was added 1-hydroxybenzotriazole hydrate (7.29 g, 47.6 mmol, Aldrich) followed by 1-ethyl-3-(3′,3‘-dimethyl-l’-aminopropyl)carbodiimide hydrochloride (9.55 g, 49.8 mmol, Sigma). After stirring at 0° C. for 15 min., N,O-dimethylhydroxylamine hydrochloride (5.10 g, 52.3 mmol, Aldrich) and N-methylmorpholine (5.8 mL, 53 mmol, Aldrich) were added. The mixture was allowed to warm to room temperature over 3 hours then stirred at room temperature for 16 hours. The solution was concentrated under vacuum and the residue partitioned between ethyl acetate-5% KHSO4 (200 mL each). The organic phase was washed in turn with 5% KHSO4, saturated sodium bicarbonate and saturated sodium chloride solutions; dried over anhydrous sodium sulfate and evaporated to an oil. The oil was crystallized from hexane to give the title product (16.10 g, 97% yield) as a fluffy white crystalline solid. TLC (ethyl acetate), single spot (UV and PMA): Rf=0.37.

A similar procedure to the one above, starting with 29.3 g of N-(benzyloxycarbonyl)-L-aspartic acid-β-(tert-butyl)ester (2-fold scale up) gave 31.18 g (94% yield) of the title product.

Part B: (3S)-(Benzyloxycarbonyl)Amino-4-Oxobutanoic Acid (tert)-Butyl Ester Semicarbazone.

To a solution of N-(benzyloxycarbonyl)-L-(N′-methyl-N′-methoxy)aspartamide -β-(tert-butyl)ester (15.50 g, 42.3 mmol) in anhydrous ether (400 mL) at 0° C. (ice bath) under a nitrogen atmosphere was added dropwise to a 1.0 M solution of LiAlH4 in ether (22.0 mL, 22.0 mmol, Aldrich) at such a rate as to keep the reaction solution temperature between 0-5° C. (addition time 15-20 min). After the addition of the lithium aluminum hydride reagent was complete, the mixture was stirred at 0-5° C. for 1 hr, then quenched by the dropwise addition of 0.3 N KHSO4 solution (100 mL). The resultant mixture was transferred to a separatory funnel adding sufficient 5% KHSO4 solution (75 mL) to dissolve the solids. The organic phase was separated and the combined aqueous washes back-extracted with ether (100 mL). The combined ether extracts were washed with saturated NaCl solution, dried over anhydrous sodium sulfate and concentrated in vacuo with minimal heating. TLC (ethyl acetate): streaky spot (UV and PMA): Rf=0.48. TLC (methanol/methylene chloride, 1:9) major spot (UV and PMA): Rf=0.75.

The crude aldehyde was immediately taken up in aqueous ethanol (45 mL water/105 mL alcohol), placed in an ice bath and treated with sodium acetate (3.82 g, 46.6 mmol) and semicarbazide hydrochloride (5.20 g, 46.6 mmol, Aldrich). The mixture was stirred at 0° C. (ice bath) under a nitrogen atmosphere for 3 hrs, allowed to warm to room temperature, and stirred overnight (16 hrs). Most of the ethanol was removed under vacuum and the residue partitioned between ethyl acetate and water (100 mL each). The organic phase was washed sequentially with 5% KHSO4, saturated sodium bicarbonate and saturated sodium chloride solutions; dried over anhydrous sodium sulfate and evaporated to dryness. The crude product of this reaction was combined with that of two similar procedures starting with 15.40 g and 4.625 g of N-(benzyloxycarbonyl)-L-(N′-methyl-N′-methoxy)aspartamide-β-(tert-butyl ester) (total: 35.525 g, 97 mmol) and these combined products were purified by flash chromotagraphy on silica gel eluting with acetone/methylene chloride (3:7) then methanol-acetone-methylene chloride (0.5:3:7) to give pure title product (27.73 g, 78.5%) as a colorless foam. TLC (MeOH—CH2Cl2, 1:9): single spot (UV and PMA), Rf=0.5 1.

Part C: (3S)-Amino-4-Oxobutanoic Acid (tert)-Butyl Ester Semicarbazone, p-Toluenesulfonate Salt

To a solution of (3S)-(benzyloxycarbonyl)amino-4-oxobutanoic acid (tert)-butyl ester semicarbazone (13.84 g, 38.0 mmol) in absolute ethanol (250 mL) was added 10% Pd/C (1.50 g, Aldrich) and the resulting mixture stirred under an atmosphere of hydrogen (balloon) until TLC (methanol/methylene chloride, 1:9) indicated complete consumption of the starting material (60 min). Note: It is important to follow this reaction closely since the product can be over-reduced. The mixture was filtered though Celite and evaporated to an oil. The oil was chased with methylene chloride (2×75 mL) then with methylene chloride/toluene (1:1, 75 mL) to give the crude amine as a white crystalline solid. TLC (EtOAc-pyridine-AcOH—H2O; 60:20:5:10) single spot (UV and PMA) Rf=0.24. Note: In this TLC system, any over-reduced product will show up immediately below the desired product, Rf=0.18 (PMA only).

The crude amine was taken up in CH3CN (60 mL) and treated with a solution of p-toluenesulfonic acid monohydrate (7.22 g, 38.0 mmol) in acetonitrile (60 mL). The crystalline precipitate was collected, washed with acetonitrile and ether, and air-dried to give the title compound (13.95 g, 92% yield) as a white, crystalline solid.

The optical purity of this material was checked by conversion to the corresponding Mosher amide [1.05 equiv (R)-(−)-α-methoxy-α-(trifluoromethyl)phenylacetyl chloride, 2.1 equivalents of i-Pr2NEt in CH2Cl2, room temperature, 30 min]. The desired product has a doublet at 7.13 ppm (1H, d, J=2.4 Hz, CH═N) while the corresponding signal for its diastereomer is at 7.07 ppm. The optical purity of the title compound obtained from the above procedure is typically>95:5.

PREPARATION 2

PREPARATION OF (3S)-(9-FLUORENYLMETHOXYCABONYL)AMINO-4-OXOBUTANOIC ACID (TERT)-BUTYL ESTER SEMICARBAZONYL-4-[2′-(4-ETHYL-PHENOXYACEC ACID)]

Part A: 4-[2′-(N-t-Butoxycarbonyl)Aminoethyl]Phenoxyacetic Acid, Methyl Ester

To a suspension 4-hydroxy-phenethylamine (7.00 g, 51.1 mmol, Aldrich) in dry dimethylformamide (50 mL) at room temperature under nitrogen was added di-tert-butyl dicarbonate (11.0 g, 50.5 mmol). After stirring at room temperature for 1 hr, the resulting clear solution was treated with methyl bromoacetate (7.5 mL, 79 mmol) and cesium carbonate (17.5 g, 53.7 mmol). After stirring at room temperature for 16 hrs, TLC (Et2O-toluene; 2:8) shows some unalkylated material remained (Rf=0.43) and a second portion of methyl bromoacetate (2.0 mL, 21 mmol) and cesium carbonate (4.5 g, 14 mmol) were added. After stirring for an additional 24 hrs, the mixture was partitioned between EtOAc-water (250 mL each), organic phase washed successively with water (3×), 5% potassium bisulfate and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. Trituration of the residue with hexane gave 15.87 g of a tan solid. Filtration of the crude product through a pad of silica gel eluting with EtOAc-hexane (2:8) and crystallization from hexane gave the title compound (14.75, 93%) as a white granular, crystalline solid. TLC (Et2O-toluene; 2:8) Rf=0.53.

Part B: 4-(2′-Aminoethyl)Phenoxyacetic Acid, Methyl Ester, Hydrochloride

To a solution 4-[2′-(N-t-butoxycarbonyl)aminoethyl]phenoxyacetic acid, methyl ester (18.31 g, 59.3 mmol) in dioxane (55 mL) at room temperature was added 4.0 N HCl in dioxane (55 mL). After stirring at room temperature for 16 hrs, the mixture was diluted with Et2O, the precipitate collected, washed thoroughly with Et2O and dried in vacuo to give the title compound (14.55 g, 94%) was a fluffy white, crystalline solid.

Part C: 1-tert-Butoxycarbonyl-Semicarbazidyl-4-[2′-(4-Ethyl-Phenoxyacetic Acid)]Methyl Ester.

A solution of t-butyl carbazate (6.60 g, 50 mmol) in dimethylformamide (50 mL) was added dropwise to a solution carbonyldiimidazole (8.10 g, 50 mmol) in dimethylformamide (80 mL) over 40 min at room temperature under nitrogen. After stirring at room temperature for an additional 30 min, 4-(2′-aminoethyl)phenoxyacetic acid, methyl ester, hydrochloride (12.3 g, 50 mmol) was added as a solid in one portion followed by a triethylamine (8.0 mL, 58 mmol) added dropwise over 30 min. After stirring at room temperature for 18 hrs, the mixture was partitioned between EtOAc-water (300 mL each). The organic phase was washed successively with water (3×), 5% potassium bisulfate, saturated sodium bicarbonate, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. Crystallization of the residue from EtOAc-hexane gave the title compound (15.50, 84%) as an off-white crystalline solid. TLC (MeOH—CH2Cl2; 1:9) Rf=0.45.

Part D: 1-tert-Butoxycarbonyl-Semicarbazidyl-4-[2′-(4-Ethyl-Phenoxyacetic Acid)]

A solution of 1-tert-butoxycarbonyl-semicarbazidyl4-[2′-(4-ethyl-phenoxyacetic acid)]methyl ester (14.68 g, 40 mmol) in dioxane (50 mL) at room temperature under nitrogen was added 1.0 N LiOH solution (50 mL). After stirring at room temperature for 1 hr. the mixture was acidified with conc. HCl and extracted with EtOAc (100 mL). The organic phase was washed with saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to a white solid. Recrystallization of the crude product from THF-EtOAc-hexane gave the title compound (13.44, 95%) as a white crystalline solid. TLC (AcOH-MeOH—CH2Cl2; 1:1:8) Rf=0.31.

Part E: Semicarbazidyl-4-[2′-(4-Ethyl-Phenoxyacetic Acid)] Hydrochloride

To a solution of 1-tert-butoxycarbonyl-semicarbazidyl-4-[2′-(4-ethyl-phenoxyacetic acid)] (13.43 g, 38.0 mmol) in dioxane (80 mL)-anisole (15 mL) at room temperature was added 4.0 N HCl in dioxane (35 mL). After stirring at room temperature for 18 hrs, additional 4.0 N HCl in dioxane (15 mL) was added. After an additional 6 hrs, the precipitate was collected, washed thoroughly with dioxane then Et2O and dried in vacuo to give the title compound (11.67 g, 100%) was a white, crystalline solid.

Part F: N-(9-Fluorenylmethoxycarbonyl)-L-(N′-Methyl-N′-Methoxy)aspartamide β-(tert-Butyl) Ester

To a solution of N-(9-fluorenylmethoxycarbonyl)-L-aspartic acid-β-(tert-butyl) ester (16.48 g, 40 mmol) in CH2Cl2 (80 mL)-tetrahydrofuran (20 mL) at 0° C. (ice bath) under a nitrogen atmosphere was added 1-hydroxybenzotriazole hydrate (7.12 g, 46.5 mmol) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)carbodiimide hydrochloride (9.20 g, 48 mmol). After stirring at 0° C. for 15 min., N,O-dimethylhydroxylamine hydrochloride (4.68 g, 48 mmol) and N-methylmorpholine (5.2 mL, 47 mmol) were added. The mixture was allowed to warm to room temperature over 2 hours then stirred at room temperature for 16 hours. The solution was concentrated under vacuum and the residue partitioned between ethyl acetate-5% KHSO4 (200 mL each). The organic phase was washed successively with 5% KHSO4, saturated sodium bicarbonate and saturated sodium chloride solutions; dried over anhydrous sodium sulfate and evaporated to an oil. Purification of the crude product by flash chromatography on silica gel eluting with EtOAc-hexane (30:70 then 35:65) gave the title product (17.75 g, 98% yield) as a colorless foam. TLC (EtOAc-hexane; 1:1) Rf=0.35.

Part G: (3S)-(9-Fluorenylmethoxycabonyl)Amino-4-Oxobutanoic Acid (tert)-Butyl Ester Semicarbazonyl-4-[2′-(4-Ethyl-Phenoxyacetic Acid)]

To a solution of N-(9-fluorenylmethoxycarbonyl)-L-(N′-methyl-N′-methoxy)aspartamide-β-(tert-butyl)ester (13.20 g, 29 mmol) in anhydrous ether (250 mL) at 0° C. (ice bath) under a nitrogen atmosphere was added dropwise to a 1.0 M solution of LiAlH4 in ether (14.5 mL, 14.5 mmol) at such a rate as to keep the reaction solution temperature between 0-5° C. (addition time 15-20 min). After the addition of the lithium aluminum hydride reagent was complete, the mixture was stirred at 0-5° C. for 1 hr. then quenched by the dropwise addition of 0.3 N KHSO4 solution (100 mL). After adding sufficient 0.3 N KHSO4 solution to dissolve most of the inorganic salts, the mixture was transferred to a separatory funnel. The organic phase was separated and the aqueous phase back-extracted with ether (100 mL). The combined ether extracts were washed with saturated NaCl solution, dried over anhydrous sodium sulfate and concentrated in vacuo with minimal heating. TLC (EtOAc-hexane): Rf=0.40.

The crude aldehyde was immediately taken up in ethanol(105 mL)-water(45 mL)-tetrahydrofuran(75 mL), placed in an ice bath and treated with sodium acetate (3.20 g, 39 mmol) and semicarbazidyl-4-[2′-(4-ethyl-phenoxyacetic acid)]hydrochloride (8.65 g, 30 mmol). The mixture was stirred at 0° C. (ice bath) under a nitrogen atmosphere for 3 hrs, allowed to warm to room temperature, and stirred overnight (16 hrs). The mixture was concentrated on a rotovap, diluted with water and resulting precipitate collected by suction. The material was dried in vacuo to give 18.36 g of crude product as a white solid. The crude product of this reaction was combined with that of a smaller scale reaction (6.34 g) starting with 4.55 g (10 mmol) of N-(9-fluorenylmethoxycarbonyl)-L-(N′-methyl-N′-methoxy)aspartamide-β-(tert-butyl ester) and partitioned between ethyl acetate-tetrahydrofuran(1: 1) and 5% KHSO4. The organic phase was washed with 5% KHSO4 and saturated sodium chloride solutions, dried over anhydrous sodium sulfate and evaporated to dryness. The residue was purified by filtration through a pad of silica gel eluting with terahydrofuran/methylene chloride (1:1). The combined product-containing fractions were evaporated to dryness and recrystallized from tetrahydrofuran-Et2O to give pure title product (17.01 g, 69%) as a white solid. TLC (AcOH-MeOH—CH2Cl2, 1:1:40): Rf=0.19.

PREPARATION 3 ASSAY FOR INHIBITION OF ICE/CED-3 PROTEASE FAMILY ACTIVITY

A. Determination of IC50 Values

Fluorescence enzyme assays detecting the activity of the compounds of Formula I utilizing the recombinant ICE and CPP32 enzymes are performed essentially according to Thornberry et al. (Nature, 356:768:774 (1992)) and Nicholson et al. (Nature, 376:37-43 (1995)) respectively, (herein incorporated by reference) in 96 well microtiter plates. The substrate is Acetyl-Tyr-Val-Ala-Asp-amino-4-methylcoumarin (AMC) for the ICE assay and Acetyl-Asp-Glu-Val-Asp-amino-4-methylcoumarin for the CPP32, Mch2, Mch3 and Mch5 assays. Enzyme reactions are run in ICE buffer (25 mM HEPES, 1 mM EDTA, 0.1% CHAPS, 10% sucrose, pH 7.5) containing 2 mM DTT at room temperature in duplicate. The assays are performed by mixing the following components:

    • 50 μL ICE, Mch2, Mch5, CPP32 (18.8, 38, 8.1 and 0.153 nM concentrations, respectively) or Mch3 (1 unit) enzyme in ICE buffer containing either 8.0 (ICE, Mch2, Mch3, CPP32) or 20 (Mch5) mM DTT;
    • 50 μL compound of Formula I or ICE buffer (control); and
    • 100 μL of 20 μM substrate.

The enzyme and the compound of Formula I to be assayed are allowed to preincubate in the microtitre plate wells for 30 minutes at room temperature prior to the addition of substrate to initiate the reaction. Fluorescent AMC product formation is monitored for one hour at room temperature by measuring the fluorescence emission at 460 nm using an excitation wavelength of 360 nm. The fluorescence change in duplicate (control) wells are averaged and the mean values are plotted as a function of inhibitor concentration to determine the inhibitor concentration producing 50% inhibition (IC50).

B. Determination of the dissociation constant Ki and irreversible rate constant k3 for irreversible inhibitors

For the irreversible inhibition of a ICE/ced-3 Family Protease enzyme with a competitive irreversible inhibitor; using the model represented by the following formulas:
The product formation at time t may be expressed as: [ P ] t = [ E ] T ( [ S ] K i [ I ] K s ) ( k s k 3 ) [ 1 - - k 3 t / ( 1 + K i [ I ] ( 1 + [ S ] K s ) ) ] Equation 1
where E, I, EI and E-I denote the active enzyme, inhibitor, non-covalent enzyme-inhibitor complex and covalent enzyme-inhibitor adduct, respectively. The Ki value is the overall dissociation constant of the reversible binding steps, and k3 is the irreversible rate constant. The [S] and Ks values are the substate concentration and dissociation constant of the substrate bound to the enzyme, respectively. [E]T is the total enzyme concentration.

The above equations are used to determine the Ki and k3 values of a given inhibitor bound to a ICE/ced-3 family protease. Thus, a continuous assay is run for sixty minutes at various concentrations of the inhibitor and the substrate. The assay is formulated essentially the same as described above for generating the data in Table 1, except that the reaction is initiated by adding the enzyme to the substrate-inhibitor mixture. The Ki and k3 values are obtained by simulating the product AMC formation as a function of time according to Equation 1.

The following are examples of compounds of the invention.

EXAMPLE 1

(3S)-3-[N—(N′-(1-NAPHTHYL)OXAMYL)LEUCINYL]AMINO-4-OXOBUTANOIC ACID

Part A: N-(1-Naphthyl)Oxamic Acid

To a solution of 1-aminonaphthylene (1.43 g, 10 mmol) and triethylamine (1.5 mL, 10.8 mmol) in CH2Cl2 (10 mL) at OC (ice bath) under nitrogen was added dropwise a solution of methyl oxalyl chloride (1.0 mL, 10.9 mmol) in CH2Cl2 (5 mL). When the addition was complete, the mixture was allowed to come to room temperature and stirred for 1 hr. The mixture was concentrated and the residue partitioned between EtOAc-5% KHSO4. The organic phase was washed with 5% KHSO4 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a pink solid. Recrystallization of the crude product from toluene-hexane gave the N-(1-naphthyl)oxamic acid methyl ester (2.066 g, 90%) as a pink crystalline solid. TLC(EtOAc-hexane) Rf=0.6.

The methyl ester (1.97 g, 8.6 mmol) was taken up in dioxane (10 mL) and treated with 1.0 N LiOH solution (10 mL, 10 mmol) and stirred at room temperature for 1 hr. The mixture was acidified with conc. HCl and extracted with EtOAc. The extract was washed with saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to a pink solid. Recrystallization of the crude product from EtOAc-hexane gave the title compound (1.712 g, 85%) as a pink crystalline solid. TLC(AcOH-MeOH—CH2Cl2; 1:1:20) Rf=0.06.

Part B: (3S)-3-[(N-Benzyloxycarbonyl)Leucinyl]Amino-4-Oxobutanoic Acid (tert)-Butyl Ester Semicarbazone

To a solution of (N-benzyloxycarbonyl)leucine N-hydroxysuccinimde ester (1.81 g, 5.0 mmol) in CH2Cl2 (30 mL) at room temperature under nitrogen was added (3S)-amino-4-oxobutanoic acid (tert)-butyl ester semicarbazone, p-toluenesulfonate salt (2.58 g, 6.4 mmol) followed by diisopropyl ethylamine (1.2 mL, 6.9 mmol). After stirring at room temperature for 16 hrs, the mixture was concentrated and the residue partitioned between EtOAc-5% KHSO4. The organic phase was washed with 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give the title compound (2.798 g) as a pale yellow foam. TLC(MeOH—CH2Cl2; 1:9) Rf=0.52.

Part C: (3S)-3-(Leucinyl)Amino-4-Oxobutanoic Acid (tert)-Butyl Ester Semicarbazone

To a solution of crude (3S)-[(N-benzyloxycarbonyl)leucinyl]amino-4-oxobutanoic acid (tert)-butyl ester semicarbazone (2.798 g, ca. 5.0 mmol) in absolute EtOH (40 mL) was added 10% Pd—C (0.40 g) and resulting mixture stirred under a hydrogen atmosphere (balloon) for 1.5 hrs. The mixture was filtered through Celite washing the filter cake with CH2Cl2 and the combined filtrates evaporated to dryness. The residue was chased with CH2Cl2 (2×20 mL) to give the title product (2.113 g) as a colorless foam. TLC(MeOH—CH2Cl2; 1:9) Rf=0.23.

Part D: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-4-Oxobutanoic Acid (tert)-Butyl Ester Semicarbazone

To a solution of N-(1-naphthyl)oxamic acid (0.095 g, 0.44 mmol) and (3S)-3-(leucinyl)amino-4-oxobutanoic acid (tert)-butyl ester semicarbazone (0.180 g, ca 0.41 mmol) in N-methylpyrrolidone(1.0 mL)-CH2Cl2(1.0 mL) at 0° C. (ice bath) under nitrogen was added hydroxybenzotriazole hydrate (0.100 g) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)carbodiimide hydrochloride (0.100 g, 0.52 mmol). After stirring at 0° C. for 2 hrs and at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a solid. The solid residue was triturated with Et2O to give the title compound (0.231 g, 97%) as an off-white solid. TLC(MeOH—CH2Cl2; 5:95) Rf=0.32.

Part E: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-4-Oxobutanoic Acid Semicarbazone

To a suspension of (3S)-3-[N—(N′-(1-naphthyl)oxamyl)leucinyl]amino-4-oxobutanoic acid (tert)-butyl ester semicarbazone (0.212 g, 0.39 mmol) in CH2Cl2(2.0 mL)-anisole(0.5 mL) at room temperature under nitrogen was added trifluoroacetic acid (2.0 mL). The resulting clear solution was stirred at room temperature for 3 hrs, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O to give the title compound (0.181 g, 95%) as an off-white solid. TLC(AcOH-MeOH—CH2Cl2; 1:1:20) Rf=0.16.

Part F: (3 S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-4-Oxobutanoic Acid

A suspension of (3S)-3-[N—(N′-(1-naphthyl)oxamyl)leucinyl]amino-4-oxobutanoic acid semicarbazone (0.173 g, 0.36 mmol) in 37% aqueous formaldehyde(1.0 mL)-acetic acid(1.0 mL)-methanol(3.0 mL) was stirred at room temperature under nitrogen for 18 hrs. The resulting clear solution was diluted with water and the resulting white precipitate collected by suction and washed with water. The combined aqueous filtrate was extracted with EtOAc. The extract was washed with water and saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to a glass. This was combined with the solid which was filtered from the aqueous mixture, taken up in CH2Cl2, filtered through Celite and evaporated to dryness. The crude product was purified by dissolving the residue in CH2Cl2 and precipitating with Et2O-hexane. The precipitate was collected by suction to give the title compound (0.129 g, 84%) as a white solid. TLC(AcOH-MeOH—CH2Cl2; 1:1:20) Rf=0.22. MS(ES) for C22H25N3O6 (MW 427.46): positive 450(M+Na); negative 426(M−H)

EXAMPLE 2

(3RS)-3-[N—(N′-(1-NAPHTHYL)OXAMYL)LEUCINYL]AMINO-5-FLUORO-4-OXOPENTANOIC ACID

Part A: (3RS, 4RS)-3-[(N-Benzyloxycarbonyl)Leucinyl]Amino-5-Fluoro-4-Hydroxypentanoic Acid, tert-Butyl Ester

To a solution of (3RS, 4RS)-3-amino-5-fluoro-4-hydroxypentanoic acid, tert-butyl ester (0.230 g, 1.1 mmol, prepared as described in Tetrahedron Letters 1994,35, 9693-9696) in CH2Cl2 (2.0 mL) at room temperature under nitrogen was added (N-benzyloxycarbonyl)leucine, N-hydroxysuccinimde ester (0.402 g, 1.1 mmol). After stirring at room temperature for 16 hrs, the mixture was evaporated to dryness and the residue purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:2) to give the title compound (0.332 g, 66%) as a colorless, viscous oil. TLC(EtOAc-hexane; 2:1) Rf =0.51.

Part B: (3RS,4RS)-3-(Leucinyl)Amino-5-Fluoro-4-Hydroxypentanoic Acid, tert-Butyl Ester, p-Toluenesulfonate Salt

To a solution of (3RS, 4RS)-3-[(N-benzyloxycarbonyl)leucinyl]amino-5-fluoro-4-hydroxypentanoic acid, tert-butyl ester (0.332 g, 0.734 mmol) in MeOH (100 mL) was added p-toluenesulsufonic acid hydrate (0.140 g, 0.737 mmol) and 10% Pd—C (0.033 g) and resulting mixture stirred under a hydrogen atmosphere (balloon) for 2 hrs. The mixture was filtered through Celite washing the filter cake with CH2Cl2 and the combined filtrates evaporated to dryness. The residue was chased with CH2Cl2 to give the title product (0.371 g) as a colorless foam.

Part C: (3RS, 4RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-5-Fluoro-4-Hydroxypentanoic Acid, tert-Butyl Ester

To a solution of N-(1-naphthyl)oxamic acid (0.161 g, 0.749 mmol, see Example 1, Part A) in N-methylpyrrolidone(1.5 mL)-CH2Cl2(1.5 mL) at room temperature under nitrogen was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophate (0.313 g, 0.823 mmol). After stirring for 0.5 hrs, the mixture was treated with a solution of (3RS, 4RS)-3-(leucinyl)amino-5-fluoro-4-hydroxypentanoic acid, tert-butyl ester, p-toluenesulfonate salt (0.371 g, 0.749 mmol) and diisopropylethylamine (0.39 mL, 2.25 mmol) in N-methylpyrrolidone(2.0 mL)-CH2Cl2(2.0 mL). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:1) to give the title compound (0.213 g, 55%) as a colorless foam. TLC(Et2O—CH2Cl2-hexane; 2:1:2, 2 developments) Rf=0.12.

Part D: (3RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-5-Fluoro-4-Oxopentanoic Acid, tert-Butyl Ester

To a solution of (3RS, 4RS)-3-[N—(N′-(1-naphthyl)oxamyl)leucinyl]amino-5-fluoro-4-hydroxypentanoic acid, tert-butyl ester (0.163 g, 0.315 mmol) in CH2Cl2 (3.0 mL) at room temperature was added Dess-Martin periodinane (0.160 g, 0.378 mmol). After stirring at room temperature for 0.5 hrs, the mixture was diluted with EtOAc and washed with dilute Na2S2O3, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:3) to give the title compound (0.155 g, 95%) as a white solid. TLC(Et2O—CH2Cl2-hexane; 2:1:2, 2 developments) Rf=0.35. MS(ES) for C27H34FN3O6 (MW 515.57): positive 538(M+Na); negative 514(M−H).

Part E: (3RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-5-Fluoro-4-Oxopentanoic Acid

To a solution of (3RS)-3-[N—(N′-(1-naphthyl)oxamyl)leucinyl]amino-5-fluoro-4-oxopentanoic Acid, tert-butyl ester (0.147 g, 0.285 mmol) in CH2Cl2(1.0 mL)-anisole(0.5 mL) at room temperature under nitrogen was added trifluoroacetic acid (1.0 mL). The resulting clear solution was stirred at room temperature for 1 hr, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O-hexane to give the title compound (0.100 g, 76%) as a white solid. MS(ES) for C23H26FN3O6 (MW 459.47): positive 482(M+Na); negative 458(M−H).

EXAMPLE 3

(3RS)-3-[N—(N′-(1-NAPHTHYL)OXAMYL)VALINYL]AMINO-5-FLUORO-4-OXOPEINTANOIC ACID

Part A: (3RS, 4RS)-3-[(N-Benzyloxycarbonyl)Valinyl]Amino-5-Fluoro-4-Hydroxypentanoic Acid, tert-Butyl Ester

To a solution of (N-benzyloxycarbonyl)valine (0.332 g, 1.32 mmol) in CH2Cl2(7.0 mL) at 0° C. (ice bath) under nitrogen was added hydroxybenzotriazole hydrate (0.219 g) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)carbodiimide hydrochloride (0.317 g, 1.65 mmol). After stirring at 0° C. for 10 min, the mixture was treated with (3RS, 4RS)-3-amino-5-fluoro-4-hydroxypentanoic acid, tert-butyl ester (0.228 g, 1.1 mmol) and the reaction allowed to warm to room temperature. After stirring at room temperature for 24 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography eluting with EtOAc-hexane (1:1) to give the title compound (0.423 g, 87%) as colorless glass. TLC(MeOH—CH2Cl2; 5:95) Rf=0.17.

Part B: (3RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)Valinyl]Amino-5-Fluoro-4-Oxopentanoic Acid

Starting with (3RS, 4RS)-3-[(N-benzyloxycarbonyl)valinyl]amino-5-fluoro-4-hydroxypentanoic acid, tert-butyl ester and following the methods described in Example 2, Parts B through E gave the title compound as a white solid. MS(ES) for C22H24FN3O6 (MW 445.45): positive 468(M+Na), 484(M+K); negative 444(M−H).

EXAMPLE 4

(3S)-3-[N-(′-(1-NAPHTHYL)OXAMYL)VALINYL] AMINO—5-(2′,6′-DICHLOROBENZYLOXY)-4-OXOPENTANOIC ACID

Part A: [(N-Benzyloxycarbonyl)Valinyl]Aspartic Acid, β-tert-Butyl, α-Methyl Ester

To a solution of (N-benzyloxycarbonyl)valine (2.10 g, 8.36 mmol) in CH2Cl2(20 mL) at 0° C. (ice bath) under nitrogen was added hydroxybenzotriazole hydrate (1.74 g) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)carbodiimide hydrochloride (2.40 g, 12.5 mmol). After stirring at 0° C. for 10 min. the mixture was treated with aspartic acid, β-tert-butyl, α-methyl ester hydrochloride (2.00 g, 8.34 mmol) and N-methylmorpholine (1.1 mL, 10 mmol), and the reaction allowed to warm to room temperature. After stirring at room temperature for 2.5 hrs, the mixture was concentrated and the residue partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give the title compound (3.55 g, 97%) as a white solid after tituration with Et2O-hexane. TLC(EtOAc-hexane; 1:1) Rf=0.48.

Part B: (Valinyl)Aspartic Acid, βtert-Butyl, α-Methyl Ester p-Toluenesulfonate Salt

To a solution of [(N-benzyloxycarbonyl)valinyl]aspartic acid, β-tert-butyl, α-methyl ester (3.55 g, 8.12 mmol) in MeOH (300 mL) was added p-toluenesulsufonic acid hydrate (1.55 g, 8.12 mmol) and 10% Pd—C (0.30 g) and resulting mixture stirred under a hydrogen atmosphere (balloon) for 2 hrs. The mixture was filtered through Celite washing the filter cake with CH2Cl2 and the combined filtrates evaporated to dryness. The residue was chased with CH2Cl2 to give the title product (3.85 g, quantitative) as a colorless foam.

Part C: [N—(N′-(1-Naphthyl)Oxamyl)Valinyl]Aspartic Acid, β-tert-Butyl, α-Methyl Ester

To a solution of N-(1-naphthyl)oxamic acid (0.683 g, 3.18 mmol, see Example 1, Part A) in N-methylpyrrolidone(7.0 mL)-CH2Cl2(7.0 mL) at room temperature under nitrogen was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophate (1.329 g, 3.49 mmol). After stirring for 15 min, the mixture was treated with N-(valinyl)aspartic acid, β-tert-butyl, α-methyl ester p-toluenesulfonate salt (1.506 g, 3.18 mmol) and diisopropylethylamine (1.66 mL, 9.53 mmol). After stirring at room temperature for 2 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:1) to give the title compound (1.153 g, 73%) as a white solid. TLC(EtOAc-hexane; 2:1) Rf=0.48.

Part D: [N-(N′-(1-Naphthyl)Oxamyl)Valinyl]Aspartic Acid, β-tert-Butyl Ester

To a solution of [N—(N′-(1-naphthyl)oxamyl)valinyl] aspartic acid, β-tert-butyl, α-methyl ester (0.490 g, 0.98 mmol) in dioxane (2.4 mL) was added 1.0 N LiOH solution (1.0 mL, 1.0 mmol). After stirring at room temperature for 1 hr, the mixture was acidified with 1.0 N HCl and extracted with EtOAc. The extract was washed with saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to give the title compound (0.481 g, quantitative) as a white solid. TLC(MeOH—CH2Cl2; 1:9) Rf=0.15.

Part E: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Valinyl]Amino-5-Diazo-4-Oxopentanoic Acid tert-Butyl Ester

To a solution of [N—(N′-(1-naphthyl)oxamyl)valinyl] aspartic acid, O-tert-butyl ester (0.095 g, 0.20 mmol) and N-methylmorpholine (22 μL, 0.20 mmol) in tetrahydrofuran (2.0 mL) at −10° C. (NaCl/ice bath) under nitrogen was added isobutyl chloroformate (28 μL, 0.22 mmol). After stirring at −10° C. for 0.5 hrs, the resulting mixed anhydride was treated with excess diazomethane/Et2O solution (prepared from 0.072 g, 0.49 mmol of 1-methyl-3-nitro-1-nitrosoguanidine, 1.0 mL 40% KOH/1.0 ml Et2O). After stirring at −10° C. for an additional 1 hr, the mixture was concentrated and the residue purified by flash chromatography on silica gel eluting with CH2Cl2-Et2O-hexane (1:2:2) to give the title compound (0.062 g, 62%) as a white solid. TLC(EtOAc-hexane; 2:1) Rf=0.63.

Part F: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Valinyl]Amino-5-Bromo-4-Oxopentanoic Acid tert-Butyl Ester

To a solution of (3S)-3-[N—(N′-(1-naphthyl)oxamyl)valinyl]amino-5-diazo-4-oxopentanoic acid tert-butyl ester (0.135 g, 0.265 mmol) in tetrahydrofuran (3.0 mL) at 0° C. was added 48% aqueous HBr (30 μL, 0.27 mmol). Gas evolution was observed. After 15 min, the mixture was partitioned between EtOAc-saturated NaHCO3, the organic phase washed with saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to give the title compound (0.147 g, quantitative) as a white solid. TLC(EtOAc-hexane; 2:1) Rf=0.72.

Part G: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Valinyl]Amino-5-(2′?6′-Dichlorobenzoyloxy)-4-Oxopentanoic Acid, tert-Butyl Ester

To a solution of (3S)-3-[N—(N′-(1-naphthyl)oxamyl) valinyl]amino-5-bromo-4-oxopentanoic acid tert-butyl ester (0.100 g, 0.18 mmol) and 2,6-dichlorobenzoic acid (0.037 g, 0.20 mmol) in dimethylformamide (1.0 mL) at room temperature under nitrogen was added potassium fluoride (0.031 g, 0.53 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:1) to give the title compound (0.084 g, 70%) as viscous oil. TLC(EtOAc-hexane; 2:1) Rf=0.71.

Part H: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Valinyl]Amino-5-(2′,6′-Dichlorobenzoyloxy)-4-Oxopentanoic Acid

To a solution of (3S)-3-[N—(N′-(1-naphthyl)oxamyl) valinyl]amino-5-(2′,6′-dichlorobenzoyloxy)-4-oxopentanoic acid, tert-butyl ester (0.084 g, 0.125 mmol) in CH2Cl2(1.0 mL)-anisole(0.5 mL) at room temperature under nitrogen was added trifluoroacetic acid (1.0 mL). The resulting clear solution was stirred at room temperature for 1 hr, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O to give the title compound (0.060 g, 78%) as an off-white solid. MS(ES) for C29H27Cl2N3O8 (MW 616.45): positive 638/640(M+Na); negative 614/616(M-H).

EXAMPLES 5-21

Starting with (3S)-3-[N—(N′-(1-naphthyl)oxamyl)valinyl]amino-5-bromo-4-oxopentanoic acid tert-butyl ester (see Example 4, Part F) and following the methods described in Example 4, Parts G through H, the compounds shown below in Table 3 were also prepared:

TABLE 3 MS(ES) Ex. B Formula MW pos. neg. 5 CH2O(2,6-diF-Ph) C28H27F2N3O7 555.53 578(M+Na) 554(M−H) 6 CH2O(2,4,6-triF-Ph) C28H26F3N3O7 573.52 596(M+Na) 572(M−H) 7 CH2O(2,3,5,6-tetraF-Ph) C28H25F4N3O7 591.51 614(M+Na) 590(M−H) 8 CH2O(6-Me-2-pyron-4-yl) C28H29N3O9 551.55 574(M+Na) 550(M−H) 9 CH2O(2-Ph-5,6- C37H33N3O9 663.68 686(M+Na) 662(M−H) benzopyran-4-on-3-yl) 10 CH2OPO(Me)Ph C29H32N3O8P 581.56 582(M+H) 580(M−H) 604(M+Na) 694(M+TFA) 11 CH2OPOPh2 C34H34N3O8P 643.63 666(M+Na) 642(M−H) 12 CH2O(2-CF3-pyrimidin-4-yl) C27H26F3N5O7 589.53 612(M+Na) 588(M−H) 13 CH2O(5-CO2Me- C27H28N4O10 568.54 591(M+Na) 567(M−H) isoxazol-3-yl) 14 CH2OPO(Me)(1-naphthyl) C33H34N3O8P 631.62 654(M+Na) 630(M−H) 744(M+TFA) 15 CH2O(4-hydroxy-Ph) C28H29N3O8 535.55 537/538(M+Na) 535/536/537 (M−H) 16 CH2O(4-OCOOCHCHCH3- C32H33N3O10 619.63 637(M+NH4) 618(M−H) Ph) 17 CH2O(4-OCHCHCH3-Ph) C31H33N3O8 575.62 576(M+H) 574(M−H) 18 CH2O(1-Naphthyl) C32H31N3O7 569.6128 19 CH2O(4-propyloxyphenyl) C30H35N3O6 533.25 534(M+H) 551 (M+NH4) 20 CF3 C22H22F3N3O6 481.15 482(M+H) 21 NH(CH2)2Ph C29H32N4O6 532.23 533(M+H) 531(M−H)

EXAMPLE 22

N-[1-(2-BENZYLOXY-5OXO-TETRAHYDRO-FURAN-3-YLCARBAMOYL)-ETHYL]-N′-(2-TERT-BUTYL-PHENYL)-OXALAMIDE

Part A: 3-(9H-Fluoren-9-ylmethoxycarbonylamino)-N-methoxy-N-methyl-suecinamic acid tert-butyl ester

To a solution of 2-(9H-Fluoren—9-ylmethoxycarbonylamino)-succinic acid 4-tert-butyl ester (5.00 g, 12.15 mmol) in CH2Cl2(50 mL) at 0° C. under N2 was added 1.2 equiv of 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide HCl (EDAC) (2.79 g, 14.58 mmol) and 1.1 equiv of HOBt.H2O (2.05 g, 13.37 mmol). The mixture was stirred at 0° C. under N2 for 15 min before addition of HCl HN(OMe)Me (1.42 g, 14.58 mmol), followed by 4-Methylmorpholine (NMM) (2.00 mL, 18.23 mmol). After stirring at 0° C. to room temperature for 5 hrs, the mixture was partitioned between EtOAc/water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (20%) to give the title compound (4.62 g, 85%) as a white foam. TLC (40%) Et(Ac/Hexane) Rf=0.44; 1HNMR (CDCl3) δ 7.75 (d, J=7.5 Hz, 2H), 7.50 (t, J=6.9 Hz, 2H), 7.40 (t, J=7.5 Hz, 2H), 7.33-7.28 (dt, J=7.5, 1.2 Hz, 2H), 5.71 (d, J=9.0 Hz, 1H), 5.04 (bq, J=7.8 Hz, 11H), 4.36 (d, J=7.2 Hz, 2H), 4.23 (t J=7.2 Hz, 11H), 3.79 (s, 3H), 3.24 (s, 3H), 2.78-2.71 (dd, J=15.0, 5.4 Hz, 1H), 2.62-254 (15.0, 6.9 Hz, 1H), 1.45 (s, 9H). MS(ES) for C23H25NO6 (MW=454.52): positive 455 (MH+).
Part B: 3-(9H-Fluoren-9-ylmethoxycarbonylamino)-4-oxo-butyric acid tert-butyl ester

To a suspension of 3-(9H-Fluoren-9-ylmethoxycarbonylamino)-N-methoxy-N-methyl-succinamic acid tert-butyl ester (4.57 g, 10.04 mmol) in Ethyl ether (30 mL) at −5° C. was added dropwise 0.5 equiv of 1.0M Lithium aluminum hydride (LAH) in ethyl ether (5.02 mL, 5.02 mmol). After stirring at −5° C. to room temperature for 1 hr, the reaction mixture was treated with 5% KHSO4 (200 mL), stirred for 5 min and then partitioned between EtOAc/water. The organic phase was washed with saturated NaCl solution (200 mL), dried over Na2SO4 and evaporated to dryness. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (20%) to give the title compound (2.18 g, 55%) as a clear oil. TLC (30% EtOAc/Hexane) Rf=0.35; 1HNMR (CDCl3) δ 9.65 (s, 1H), 7.77 (d, J=7.2 Hz, 2H), 7.50 (d, J=7.5 Hz, 2H), 7.41 (t, J=7.5 Hz, 2H), 7.33 (dt, J=7.5, 1.2 Hz, 2H), 5.88 (d, J=7.2 Hz, 11H), 4.50-4.36 (m, 2H), 4.24 (t, J=6.6 Hz, 1H), 3.54-3.45 (m, 11H), 3.00-2.93 (dd, J=17.4, 4.8 Hz, 11H), 2.82-274 (dd, J=17.7, 5.1s Hz, 1H), 1.45 (s, 9H). MS(ES) for C23H25NO5 (MW=395.45): positive 396 (MH+).
Part C: 4,4-Bis-benzyloxy-3-(9H-fluoren-9-ylmethoxycarbonylamino)-butyric acid tert-butyl ester

To a suspension of 3-(9H-Fluoren-9-ylmethoxycarbonylamino)-4-oxo-butyric acid tert-butyl ester (1.24 g, 3.14 mmol) in Dichloromethane (10 mL) at room temperature was added 0.20 equiv TsOH.H2O (0.12 g, 0.63 mmol) and followed by dropwise 5.0 equiv of Benzyl alcohol (1.62 mL, 15.68 mmol). After stirring room temperature for 18 hrs, the reaction mixture was filtered through celite and the filtrate was concentrated in vacuo to obtain a crude title compound. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (10-40%) to give the title compound (0.75 g, 40%) as clear oil. TLC (40% EtOAc/Hexane) Rf=0.68; 1HNMR (CDCl3) δ 7.76 (d, J=7.2 Hz, 2H), 7.59 (d, J=7.5 Hz, 2H), 7.39 (t, J=7.5 Hz, 21H), 7.35-7.27 (m, 12H), 5.37 (d, J=9.6 Hz, 1H), 4.73-4.52 (1,5H), 4.35 (d, J=6.6 Hz, 2H), 4.24-4.16 (q, J=6.6 Hz, 2H), 2.55-2.50 (m, 2H), 1.39 (s, 9H). MS(ES) for C37H39NO9 (MW=593.71): positive 611 (M+NH4+).
Part D: 4,4-Bis-benzyloxy-3-{2-[(2-tert-butyl-phenylaminooxalyl)-amino]-propionylamino}-butyric acid tert-butyl ester

4,4-Bix-benzyloxy-3-(9H-fluoren-9-ylmethoxycarbonylamino)-butyric acid tert-butyl ester (0.63 g, 1.06 mmol) was stirredin 5% Piperidine/DMF (3 mL) at room temperature. After stirring at room temperature for 15 min, the reaction mixture was treated with Water (20 mL), stirred for 5 min and then partitioned between EtOAc/water. The organic phase was washed with Water (3×20 mL), saturated NaCl solution (3×20 mL), dried over Na2SO4 and evaporated to dryness to afford crude 3-Amino-4,4-bis-benzyloxy-butyric acid tertbutyl ester (1). The crude residue 1 was ready to be used for coupling reaction as a crude product.

To a solution of (2S)-2-[(2-tert-butyl-phenylaminooxalyl)-amino]-propanoic acid (0.37 g, 1.27 mmol) in CH2Cl2/NMP (1:1, 3 mL) at room temperature under N2 was added 1.5 equiv HBTU (0.61 g, 1.59 mmol). The mixture solution was stirred at room temperature under N2 for 45 min before addition of 1, followed by Et3 N (0.44 mL, 3.18 mmol). After stirring at room temperature for 18 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was purified by flask column chromatography on silica gel eluding with EtOAc/Hexane (20%) to give the title compound (0.29 g, 42%) as a yellow foam. TLC (30% EtOAc/Hexane) Rf=0.59; 1HNMR (CDCl3) δ 9.53 (s, 1H), 8.06 (dd, J=8.1, 3.6 Hz, 1H), 8.01 (dt, J=8.1, 1.2 Hz, 11H), 7.42 (d, J=7.5 Hz, 1H), 7.37-7.25 (m, 111H), 7.17 (tt, J=7.5, 1.2 Hz, 1H), 6.62-6.53 (dd, J=16.2, 9.0 Hz, 1H), 4.72-4.35 (m, 7H), 2.66 (d, J=6.0 Hz, 2H), 1.45 (s, 9H), 1.38 (d, J=4.2 Hz, 3H); MS(ES) for C37H47N3O7 (MW-645.79): negative 654 ([M−H]−).
Part E: N-[1-(2-Benzyloxy-5-oxo-tetrahydro-furan-3-ylcarbamoyl)-ethyl]-N′-(2-tert-butyl-phenyl)-oxalamide

4,4-Bis-benzyloxy-3-{2-[(2-tert-butyl-phenylaminooxalyl)-amino]-propionylamino}-butyric acid tert-butyl ester (0.16 g, 0.25 mmol) was stirred in 205% TFA/CH2Cl2 (2 mL) at room temperature. After stirring at room temperature for 15 min., the reaction mixture was concentrated to dryness to afford crude tittle compounds. The residue was purified by flask column chromatography on silica gel eluding with EtOAc/Hexane (20-40%) to give the title compounds (0.09 g, 74%) as white foam.

Major diastereomer: TLC (40% EtOAc/Hexane) Rf=0.29; 1HNMR (CDCl3) δ 9.53 (d, J=7.2 Hz, 1H), 8.09 (t, J=7.8 Hz, 1H), 7.93 (m) 1H), 7.42 (d, J=9.0 Hz, 1H), 7.35-7.15 (m, 7H), 6.70 (d, J=8.1 Hz, 1H), 5.45 (d, J=5.1 Hz, 1H), 4.90-4.41 (m, 4H), 3.06-2.83 (m, 1H), 2.53-2.35 (m, 1H), 1.47 (d, J=7.2 Hz, 3H), 1.44 (s, 9H); MS(ES) for C26H31N3O6 (MW=481.54): positive 482 (MH+).

Minor diastereomer: TLC (40% EtOAc/Hexane) Rf=0.22; 1HNMR (CDCl3) δ 9.52 (s, 1H), 8.02-7.93 (m, 2H), 7.44 (dd, J=8.1, 1.5 Hz, 1H), 7.36-8.28 (m, 6H), 7.19 (dt, J=9.30, 1.5 Hz, 1H)6.67 (d, J=7.8 Hz, 1H), 5.54 (d, J=5.4 Hz, 1H), 4.92-4.44 (m, 4H), 2.95-2.85 (m, 1H), 2.55-2.44 (m, li), 1.49 (d, J=7.2 Hz, 3H), 1.44 (s, 9H); MS(ES) for C26H31N3O6 (MW=481.54): positive 482 (MH+).

EXAMPLE 23

(3S)-3-[N—(N′-(1-NAPHTHYL)OXAMYL)LEUCINYL]AMINO-5-(DIPHENYLPHOSPHINYLOXY)-4-OXOPENTANOIC ACID

Part A: [(N-Benzyloxycarbonyl)Leucinyl]Aspartic Acid, O-tert-Butyl, α-Methyl Ester

To a solution of (N-benzyloxycarbonyl)leucine, N-hydroxysuccinimide ester (4.54 g, 12.5 mmol) and aspartic acid, β-tert-butyl, α-methyl ester hydrochloride (3.00 g, 12.5 mmol) in CH2Cl2 (20 mL) at room temperature under nitrogen was added N-methylmorpholine (1.65 mL, 15 mmol). After stirring at room temperature for 18 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give the title compound (5.56 g, 99%) as viscous oil. TLC(EtOAc-hexane; 1:1) Rf=0.48.

Part B: (3S)-3-[—(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-5-Bromo-4-Oxopentanoic Acid tert-Butyl Ester

Starting with [(N-benzyloxycarbonyl)leucinyl]aspartic acid, β-tert-butyl, α—methyl ester and following the methods described in Example 4, Parts B through F; gave the title compound as a white solid. TLC(CH2Cl2-Et2O-hexane; 1:2:2) Rf=0.32.

Part C: (3S)-3-[N-(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-5-(Diphenylphopshinyloxy)-4-Oxopentanoic Acid, tert-Butyl Ester

To a solution of (3S)-3-[N—(N′-(1-naphthyl)oxamyl) leucinyl]amino-5-bromo-4-oxopentanoic acid tert-butyl ester (0.108 g, 0.187 mmol) and diphenylphosphinic acid (0.046 g, 0.21 mmol) in dimethylformamide (1.0 mL) at room temperature under nitrogen was added potassium fluoride (0.033 g, 0.58 mmol). After stirring at room temperature for 48 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography on silica gel eluting with CH2Cl2-Et2O-hexane (1:2:2) to give the title compound (0.114 g, 85%) as a white solid. TLC(EtOAc-hexane; 2:1) Rf=0.26.

Part D: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Leucinyl]Amino-5-(Diphenylphosphinyloxy)-4-Oxopentanoic Acid

To a solution of (3S)-3-[N—(N′-(1-naphthyl)oxamyl) leucinyl]amino-5-(diphenylphosphinyloxy)-4-oxopentanoic acid, tert-butyl ester (0.114 g, 0.16 mmol) in CH2Cl2(1.0 mL)-anisole(0.5 mL) at room temperature under nitrogen was added trifluoroacetic acid (1.0 mL). The resulting clear solution was stirred at room temperature for 1 hr, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O-hexane to give the title compound (0.062 g, 59%) as an off-white solid. MS(ES) for C34H34N3O8P (MW 657.66): positive 680(M+Na); negative 656(M−H).

EXAMPLES 24-27

Starting with (3S)-3-[N—(N′-(1-naphthyl)oxamyl)leucinyl]amino-5-bromo-4-oxopentanoic acid tert-butyl ester (see Example 23, Part B) and following the methods described in Example 23, Parts C through D, the compounds shown below in Table 4 were also prepared:

TABLE 4 MS(ES) Ex. B Formula MW pos. neg. 24 CH2OCO(2,6-diCl-Ph) C30H29Cl2N3O8 630.48 652/654 (M+Na) 628/630 (M−H) 25 CH2O(2,4,6-triF-Ph) C29H28F3N3O7 587.55 610(M+Na) 586(M−H) 26 CH2O(2,3,5,6-tetraF-Ph) C29H27F4N3O7 605.54 628(M+Na) 604(M−H) 27 CH2OPO(Me)Ph C30H34N3O8P 595.59 596(M+H) 594(M−H) 618(M+Na) 708(M+TFA)

EXAMPLES 28-77

Following the general methods described in Example 4, Parts A through H substituting (N-benzyloxycarbonyl)alanine for (N-benzyloxycarbonyl)valine in Part A, the appropriate oxamic acid for N-(1-naphthyl)oxamic acid in Part C, and the appropriate acid or phenol for 2,6-dichlorobenzoic acid in Part G, the compounds shown below in Table 5 were also prepared:

TABLE 5 MS(ES) Ex. R1 B Formula MW Pos. neg. 28 (2-Ph)Ph CH2O(2-F-Ph) C28H26FN3O7 535.53 558(M+Na) 534(M−H) 29 (2-Ph)Ph CH2OCO(2,6- C29H25Cl2N3O8 614.44 652/654 612/614(M−H) di-Cl-Ph) (M+K) 30 (2-Ph)Ph CH2OPOPh2 C34H32N3O8P 641.61 664(M+Na) 640(M−H) 680(M+K) 31 (2-t-Bu)Ph CH2O(2-F-Ph) C26H30FN3O7 515.54 516(M+H) 514(M−H) 538(M+Na) 554(M+K) 32 (2-t-Bu)Ph CH2OPOPh2 C32H36N3O8P 621.63 644(M+Na) 620(M−H) 666(M+K) 33 1-naphthyl-CH2 CH2O(2,3,5,6- C27H23F4N3O7 577.48 600(M+Na) 576(M−H) tetra-F-Ph) 616(M+K) 34 1-naphthyl-CH2 CH2OCO(2,6- C28H25Cl2N3O8 602.42 624/626(M+Na) 600/602(M−H) di-Cl-Ph) 640/642(M+K) 714/716 (M+TFA) 35 1-naphthyl-CH2 CH2OPOPh2 C33H32N3O8P 629.60 652(M+Na) 628(M−H) 668(M+K) 36 (2-tBu)Ph CH2O(2,3,5,6- C26H26BrF4N3O7 648.40 646(M−H) tetra-F-4- Br)Ph) 37 (2-tBu)Ph CH2OCO(2,6- C27H29Cl2N3O8 594.45 616/618(M+Na) 492/594(M−H) di-Cl-Ph) 38 (2-1)Ph CH2OCO(2,6- C23H20Cl2IN3O8 664.24 di-Cl-Ph) 39 (2-1)Ph CH2OCO(2,6- C23H20Cl2FN3O8 556.33 di-Cl-Ph) 40 (2,5-di-tBu)Ph CH2O(2,3,5,6- C30H35F4N3O7 625.62 626(M+H) 624(M−H) tetra-F-Ph) 648(M+Na) 41 (2-Cl)Ph CH2OPOPh2 C28H27CIN3O8P 599.96 598(M−H) 42 (2-Cl)Ph CH2OCO(2,6- C23H20Cl3N3O8 572.79 572/574/576 570/572/574 di-Cl-Ph) (M+H) (M−H) 43 (4-F)Ph CH3OPOPh2 C28H27FN3O8P 583.51 606(M+H) 582(M−H) 44 (4-F)Ph CH2OCO(2,6- C23H20Cl2FN3O8 556.33 578/480(M+Na) 554/556(M−H) di-Cl-Ph) 45 (2-morpholin-4- CH2OPOPh2 C35H35F6N4O11P 832.65 741(M+Na) 717(M−H) yl-5- trifluoromethyl) Ph 46 (2-pyrrolidin-1- CH2OPOPh2 C35H35F6N4O10P 816.65 725(M+Na) 701(M″H) yl-5- trifluoromethyl) Ph 47 (2-tBu)Ph CH2OPOPh2 C32H36N3O8P 621.63 644(M+Na) 620(M−H) 48 5,6,7,8- CH2OPOPh2 C32H34N3O8P 619.61 620(M+H) 618(M−H) tetrahydro-1- 642(M+Na) naphthyl 49 5,6,7,8- CH2OCO(2,6- C27H27Cl2N3O8 592.43 614/616(M+Na) 590/592(M−H) tetrahydro-1- di-Cl-Ph) naphthyl 50 5,6,7,8- CH2O(2,3,5,6- C26H25F4N3O7 567.49 590(M+Na) 566(M−H) tetrahydro-1- tetra-F-ph) naphthyl 51 PhCH2 CH2O(2,3,5,6- C23H23Cl2N3O8 552.37 550/552(M−H) tetra-F-Ph) 52 PhCH2 CH2OCO(2,6- C24H23Cl2N3O8 552.37 550/552(M−H) di-Cl-Ph) 53 1-adamantanyl CH2OPOPh2 C32H38N3O8P 623.64 646(M+Na) 622(M−H) 54 1-adamantanyl CH2OCO(2,6- C27H31Cl2N3O8 596.46 594/596(M−H) di-Cl-Ph) 55 cyclo-hexyl CH2OCO(2,6- C23H27Cl2N3O8 544.39 566(M+Na) di-Cl-Ph) 56 cyclo-hexyl CH2OPOPh2 C28H34N3O8P 571.57 594(M+Na) 570(M−H) 610(M+K) 57 (2-Cl)Ph CH2OPOPh2 C28H27CIN3O8P 5999.96 622/624(M+Na) 598/600(M−H) 58 (2-Cl)Ph CH2OCO(2,6- C23H20Cl3N3O8 572.79 594(M+Na) di-Cl-Ph) 59 (2,5-di-6Bu)Ph CH2OPOPh2 C36H44N3O8P 677.73 700(M+Na) 676(M−H) 60 (2,5-di-6Bu)Ph CH2OCO(2,6- C31H37Cl2N3O8 650.55 650/652(M+H) 648/650(M−H) di-Cl-Ph) 672/674(M+Na) 61 1,2,3,4- CH2OPOPh2 C32H34N3O8P 619.61 620(M+H) 618(M−H) tetrahydro-1- 642(M+Na) naphthyl 62 1,2,3,4- CH2OCO(2,6- C27H27Cl2N3O8 592.43 614/616(M+Na) 590/592(M−H) tetrahydro-1- di-Cl-Ph) naphthyl 63 1-adamantanyl CH2O(2,3,5,6- C30H23F4N3O7 613.52 636(M+Na) 612(M−H) tetra-F-Ph) 64 1-adamantanyl CH2OPOPh2 C36H32N3O8 665.64 688(M+Na) 664(M−H) 65 1-adamantanyl CH2OCO(2,6- C31H25Cl2N3O8 638.46 660/662(M+Na) 636/638(M−H) di-Cl-Ph) 66 (2-F)Ph CH2O(2,3,5,6- C22H18F5N3O7 531.39 554(M+Na) 530(M−H) tetra-F-Ph) 67 (2-F)Ph CH2OPOPh2 C28H27FN3O8P 583.51 606(M+Na) 582(M−H) 68 (2-F)Ph CH2OCO(2,6- C23H20Cl2FN3O8 556.33 578/580(M+Na) 554/556(M−H) di-Cl-Ph) 69 (4-n-heptyl)Ph CH2OPOPh2 C35H42N3O8P 663.71 686(M+Na) 662(M−H) 70 (4-n-heptyl)Ph CH2OCO(2,6- C30H35Cl2N3O8 636.53 658/660(M+Na) 634/636(M−H) di-Cl-Ph) 71 Ph(CH2)2 CH2O(2,3,5,6- C24H23F4N3O7 541.46 542(M+H) 540(M−H) tetra-F-Ph) 564(M+Na) 72 Ph(CH2)2 CH2OPOPh2 C30H32N3O8P 593.57 594(M+H) 592(M−H) 616(M+Na) 566/568(M+H) 73 Ph(CH2)2 CH2OCO(2,6- C25H25Cl2N3O8 566.39 566/568(M+H) 564/566(M−H) di-Cl-Ph) 588/590(M+Na) 714(M+Na) 74 (2-1)Ph CH2OPOPh2 C28H27IN3O8P 691.41 714(M+Na) 690(M−H) 75 (2-1)Ph CH2OCO(2,6- C23H20Cl2IN3O8 664.24 686/688(M+Na) 662/664(M−H) di-Cl-Ph) 776(M+TFA) 76 (2-tBu)Ph CH2OCO(2,6- C27H29Cl2N3O8 594.45 616/618(M+Na) 592/594(M−H) di-Cl-Ph) 77 (2-PhCH2)Ph CH2O(2,3,5,6- C29H30N3O8P 579.57 578(M−H) tetra-F-Ph)

EXAMPLE 78

(3S)-3-[N—(N′-(1-NAPHTHYLNETHYL)OXAMYL)VALNYL] AMINO-5-(2′,3′,5′,6′-TETRAFLUOROPHENOXY)-4-OXOPENTANOIC ACID

Part A: [(N-Benzyloxycarbonyl)Valinyl]Aspartic Acid, β-tert-Butyl Ester

To a suspension of aspartic acid β-tert-butyl ester (3.784 g, 20 mmol) in acetonitrile (200 mL) at room temperture under nitrogen was added bis(trimethylsilyl)acetamide (9.9 mL, 40 mmol). After stirring at room temperature for 30 min, the resulting clear solution was treated with (N-benzyloxycarbonyl)valine N-hydroxysuccinimide ester (6.97 g, 20 mmol). After stirring at room temperature for an additional 18 hrs, the mixture was treated with water (20 mL), concentrated on a rotovap and then partitioned between EtOAc/water. The organic phase was washed with water, 5% KHSO4 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. Trituration with Et2O-hexane gave the title compound (8.37 g, 99%) as a white solid. TLC(EtOAc-hexane; 1:1) Rf=0.06.

Part B: (3S)-3-[(N-Benzyloxycarbonyl)Valinyl]Amino-5-Bromo-4-Oxopentanoic Acid tert-Butyl Ester

A solution of [(N-benzyloxycarbonyl)valinyl]aspartic acid, β-tert-butyl ester (8.37 g, 19.9 mmol) and N-methylmorpholine (3.50 mL, 32 mmol) in tetrahydrofuran (100 mL) at −10° C. (NaCl/ice bath) under nitrogen was treated dropwise with isobutyl chloroformate (3.87 mL, 29.8 mmol). After stirring at −10° C. for 20 min, the mixture was filtered (sinctered glass) into a pre-cooled receiver (ice bath) washing the filter cake with additional tetrahydrofuran (approx. 30 mL). The combined filtrate was treated with excess diazomethane/Et2O solution (prepared from 7.32 g, 50 mmol of 1-methyl-3-nitro-1-nitrosoguanidine, 40 mL 40% KOH/65 ml Et2O) at 0° C. (ice bath) under nitrogen. After stirring at 0° C. for 15 min and at room temperature for 30 min, the reaction mixture was again cooled to 0° C. and treated with 48% HBr(10 mL, 60 mmol)/acetic acid(10 mL). After stirring at 0° C. for 15 min and at room temperature for 30 min, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, saturated NaHCO3, and saturated NaCl solutions dried over anhydrous Na2SO4 and evaporated to a dryness. Trituration with hexane gave the crude title compound (9.71 g, 98%) as a white solid. TLC(EtOAc-hexane; 1:1) Rf=0.63.

Part C: (3S)-3-[K-Benzyloxycarbonyl)Valinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxopentanoic Acid tert-Butyl Ester

To a solution of (3S)-3-[(N-benzyloxycarbonyl)valinyl]amino-5-bromo-4-oxopentanoic acid tert-butyl ester (9.71 g, 19.4 mmol) and 2,3,5,6-tetrafluorophenol (3.65 g, 22 mmol) in tetrahydrofuran (20 mL) at room temperature under nitrogen was added potassium fluoride (2.91 g, 50 mmol). After stirring at room temperature for 4 hrs, the mixture was diluted with EtOAc (approx. 100 mL), washed with saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:3) to give the title compound (9.19 g, 79%) as a white solid after trituration with Et2O-hexane. TLC(EtOAc-hexane; 1:1) Rf=0.70.

Part D: (3S, 4RS)-3-[(N-Benzyloxycarbonyl)Valinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of (3S)-3-[(N-benzyloxycarbonyl)valinyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-oxopentanoic acid tert-butyl ester (9.19 g, 15.7 mmol) in MeOH(200 mL)/tetrahydrofuran(200 mL) at 0° C. under nitrogen was added sodium borohydride (0.594 g, 15.7 mmol). After stirring at 0° C. for 1 hr, the mixture was concentrated and the residue partitioned between EtOAc-half saturated NH4Cl solution. The organic phase was washed with saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:3) to give the title compound (7.99 g, 87%) as a white solid. TLC(EtOAc-hexane; 1:1) Rf=0.54.

Part E: (3S, 4RS)-3-(Valinyl)Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of (3S, 4RS)-3-[(N-benzyloxycarbonyl)valinyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (7.99 g, 13.6 mmol) in MeOH (130 mL) was added 10% Pd—C (0.80 g) and resulting mixture stirred under a hydrogen atmosphere (balloon) for 2 hrs. The mixture was filtered through Celite washing the filter cake with CH2Cl2 and the combined filtrates evaporated to dryness. The residue purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:3) then methanol to give the title compound (5.13 g, 83%) as a viscous oil. TLC(EtOAc-hexane; 1:1) Rf=0.07.

Part F: (3S, 4RS)-3-[N—(N′-(1-Naphthylmethyl)Oxamyl) Valinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of N-(1-naphthylmethyl)oxamic acid (0.051 g, 0.22 mmol, prepared from 1-naphthylmethylamine by the method described in Example 1, Part A) in N-methylpyrrolidone(1.0 mL)-CH2Cl2(1.0 mL) at room temperature under nitrogen was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophate (0.092 g, 0.24 mmol). After stirring for 15 min, the mixture was treated with (3S,4RS)-3-(valinyl)amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.100 g, 0.22 mmol) and diisopropylethylamine (115 μL, 0.66 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give the crude title compound (0.157 g, 100%) as a viscous oil. TLC(EtOAc-hexane; 1:1) Rf=0.44.

Part G: (3S)-3-[N—(N′-(1-Naphthylmethyl)Oxamyl)Valinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxopentanoic Acid tert-Butyl Ester

To a solution of (3S,4RS)-3-[N—(N′-(1-naphthylmethyl)oxamyl)valinyl]-amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.157 g, ca 0.22 mmol) in dimethylsulfoxide (5 mL) at room temperature under nitrogen was added Dess-Martin Periodinane (0.600 g, 1.42 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue (0.175 g) was purified by flash chromatography on silica gel eluting with EtOAc-hexane (3:7) to give the title compound (0.111 g, 77%) as a white solid. TLC(EtOAc-hexane; 1:1) Rf=0.58.

Part H: (3S)-3-[N—(N′-(1-Naphthylmethyl)Oxamyl)Valinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxopentanoic Acid

To a solution of (3S)-3-[N—(N′-(1-naphthylmethyl)oxamyl)valinyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-oxopentanoic acid, tert-butyl ester (0.108 g, 0.16 mmol) in CH2Cl2(2.0 mL)-anisole(0.1 mL)-water(0.05 mL) at room temperature under nitrogen was added trifluoroacetic acid (2.0 mL). The resulting clear solution was stirred at room temperature for 2 hr, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O to give the title compound (0.098 g, 100%) as a white solid. MS(ES) for C29H27F4N3O7 (MW 605.54): positive 628(M+Na); negative 604(M−H).

EXAMPLES 79-125

Starting with (3S,4RS)-3-(valinyl)amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (see Example 78, Part E) and following the methods described in Example 78, Parts F through H, the compounds shown below in Table 6 were also prepared:

TABLE 6 MS(ES) Ex. R1 Formula MW pos. neg. 79 PhCH2 C25H25F4N3O7 555.48 556(M+H) 554(M−H) 578(M+Na) 80 Ph(CH2)2 C26H27F4N3O7 569.51 592(M+Na) 568(M−H) 81 Ph2CH C31H29F4N3O7 631.58 654(M+Na) 630(M−H) 82 Ph C24H23F4N3O7 541.46 564(M+Na) 540(M−H) 83 (2-Ph)Ph C30H27F4N3O7 617.55 640(M+Na) 616(M−H) 730(M+TFA) 84 (2-PhCH2)Ph C31H29F4N3O7 631.58 654(M+Na) 630(M−H) 85 (3-PhO)Ph C30H27F4N3O8 633.55 634(M+H) 632(M−H) 656(M+Na) 86 4-Cl-1-naphthyl C28H24ClF4N3O7 625.96 648/650(M+Na) 624/626(M−H) 87 2-anthryl C32H27F4N3O7 641.57 642(M+H) 640(M−H) 88 2-benzimidazolyl C25H23F4N5O7 581.48 582(M+H) 580(M−H) 604(M+Na) 89 1-adamantanyl C28H33F4N3O7 599.58 600(M+H) 598(M−H) 90 (2-F)Ph C24H22F5N3O7 559.45 582(M+Na) 558(M−H) 672(M+TFA) 91 (4-F)Ph C24H22F5N3O7 559.45 582(M+Na) 558(M−H) 672(M+TFA) 92 (2-CF3)Ph C25H22F7N3O7 609.45 632(M+Na) 608(M−H) 722(M+TFA) 93 (2-t-Bu)Ph C28H31F4N3O7 597.56 620(M+Na) 596(M−H) 710(M+TFA) 94 (4-n-heptyl)Ph C31H37F4N3O7 639.64 662(M+Na) 638(M−H) 95 (2-CH3O)Ph C25H25F4N3O8 571.48 594(M+Na) 570(M−H) 96 (2-PhO)Ph C30H27F4N3O8 633.55 656(M+Na) 632(M−H) 746(M+TFA) 97 2-naphthyl C28H25F4N3O7 591.51 614(M+Na) 590(M−H) 98 5,6,7,8-tetrahydro- C28H29F4N3O7 595.55 618(M+Na) 594(M−H) 1-naphthyl 99 1-anthryl C32H27F4N3O7 641.57 664(M+Na) 640(M−H) 100 2-pyridinyl C23H22F4N4O7 542.44 543(M+H) 541(M−H) 101 4-pyridinyl C23H22F4N4O7 542.44 543(M+H) 541(M−H) 102 2,3,5,6-tetrafluoro- C23H18F8N4O7 614.40 615(M+H) 613(M−H) 4-pyridinyl 103 2-pyrazinyl C22H21F4N5O7 543.43 544(M+H) 542(M−H) 104 1,2,3,4-tetrahydro- C28H29F4N3O7 595.55 596(M+H) 594(M−H) 1-naphthyl 618(M+Na) 708(M+TFA) 634(M+K) 105 (2-Cl)Ph C24H22ClF4N3O7 575.90 598/600(M+Na) 574/576(M−H) 106 (2-Br)Ph C24H22BrF4N3O7 620.35 644/642(M+Na) 620/618(M−H) 734/732(M+TFA) 107 (2-I)Ph C24H22F4IN3O7 667.35 690(M+Ma) 666(M−H) 706(M+K) 780(M+TFA) 108 (2,6-di-F)Ph C24H22F6N3O7 577.44 600(M+Na) 576(M−H) 690(M+TFA) 109 (2,5-di-t-Bu)Ph C32H39F4N3O7 653.67 654(M+H) 652(M−H) 676(M+Na) 688(M+Cl) 692(M+K) 766(M+TFA) 110 5-indanyl C27H27F4N3O7 581.52 604(M+Na) 580(M−H) 620(M+K) 694(M+TFA) 111 (3,4,5-tri- C28H31F4N3O10 645.56 646(M+H) 644(M−H) MeO)PhCH2 668(M+Na) 684(M+K) 112 methyl C19H21F4N3O7 479.38 502(M+Na) 478(M−H) 592(M+TFA) 113 n-heptyl C25H33F4N3O7 563.55 586(M+Na) 562(M−H) 602(M+K) 676(M+TFA) 114 t-octyl C26H35F4N3O7 577.57 600(M+Na) 576(M−H) 115 cyclo-hexyl C24H29F4N3O7 547.50 548(M+H) 546(M−H) 570(M+Na) 660(M+TFA) 586(M+K) 116 5-Ph-3-pyrazolyl C27H25F4N5O7 607.52 630(M+Na) 606(M−H) 646(M+K) 117 (2-F-4-I)Ph C24H21F5IN3O7 685.34 686(M+H) 684(M−H) 708(M+Na) 720(M+Cl) 724(M+K) 118 (2,3,4,5- C24H19F8N3O7 613.41 614(M+H) 612(M−H) tetra-F)Ph 636(M+Na) 726(M+TFA) 652(M+K) 119 (2,3,4,6- C24H19F8N3O7 613.41 614(M+H) 612(M−H) tetra-F)Ph 636(M+Na) 726(M+TFA) 652(M+K) 120 (2,3,5,6- C24H19Cl4F4N3O7 679.23 700/702/704(M+Na) 676/678/680(M−H) tetra-Cl)Ph 716/718/720(M+K) 790/792/794 (M+TFA) 121 (2,3,4,5,6-penta- C24H18F9N3O7 631.40 654(M+Na) 630(M−H) F)Ph 670(M+K) 666(M+Cl) 122 Ph2N C30H28F4N4O7 632.57 633(M+H) 631(M−H) 655(M+Na) 745(M+TFA) 123 PHCH2(Ph)N C31H30F4N4O7 646.59 647(M+H) 645(M−H) 669(M+Na) 681(M+Cl) 685(M+K) 124 PhCH2O C25H25F4N3O7 571.48 594(M+Na) 570(M−H) 684(M+TFA) 125 5-quinolinyl C29H25F7N4O9 706.53 593(M+H) 591(M−H)

EXAMPLE 126

(3S)-3-[N—(N′-(2-TERT-BUTYLPHENYL)OXAMYL)ALANINYL] AMINO-5-(2′,3′,5′,6′-TETRAFLUOROPHENOXY)-4-OXOPENTANOIC ACID

Part A: [(N-Benzyloxycarbonyl)Alaninyl]Aspartic Acid, β-tert-Butyl Ester

To a suspension of aspartic acid β-tert-butyl ester (3.784 g, 20 mmol) in dimethylformamide (150 mL) at room temperture under nitrogen was added bis(trimethylsilyl)-trifluoroacetamide (10.6 mL, 40 mmol). After stirring at room temperature for 30 min, the resulting clear solution was treated with (N-benzyloxycarbonyl)alanine N-hydroxysuccinimide ester (6.406 g, 20 mmol). After stirring at room temperature for an additional 48 hrs, the mixture was treated with water (20 mL), stirred for 15 min and then partitioned between EtOAc/water. The organic phase was washed with water, 5% KHSO4 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was dissolved in Et2O and extracted with saturated NaHCO3. The aqueous extract was acidified (pH 2.0) with concentrated HCl and extracted with EtOAc. The EtOAc extract was washed with saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to a give the title compound (6.463 g, 82%) as a white foam. TLC(EtOAc-hexane-AcOH; 70:30:2) Rf=0.50.

Part B: (3S,4RS)-3-(Alaninyl)Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

Starting with [(N-benzyloxycarbonyl)alaninyl]aspartic acid, β-tert-butyl ester and following the methods described in Example 28, Parts B through E gave the title compound as a colorless, viscous oil. TLC(EtOAc-hexane; 1:1) Rf=0.06.

Part C: (3S,4RS)-3-[N—(N′-(2-tert-Butylphenyl)Oxamyl) Alaninyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of N-(2-tert-butylphenyl)oxamic acid (0.041 g, 0.19 mmol, prepared from 2-tert-butylaniline by the method described in Example 1, Part A) in CH2Cl2(6.0 mL) at 0° C. under nitrogen was added hydroxybenzotriazole hydrate (0.030 g) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)-carbodiimide hydrochloride (0.050 g, 0.26 mmol). After stirring at 0° C. for 10 min, the mixture was treated with (3S,4RS)-3-(alaninyl)amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.079 g, 0.19 mmol) and N-methylmorpholine (22 μL, 0.20 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give the crude title compound (0.090 g, 77%) as a viscous oil. TLC(EtOAc-hexane; 1:1) Rf=0.70.

Part D: (3S)-3-[N-(N′-(2-tert-Butylphenyl)Oxamyl)Alaninyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxopentanoic Acid tert-Butyl Ester

To a solution of (3S,4RS)-3-[N—(N′-(2-tert-butylphenyl)oxamyl)alaninyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.0.092 g, ca 0.15 mmol) in CH2Cl2 (6.5 mL) at room temperature under nitrogen was added iodobenzene diacetate (0.188 g, 0.58 mmol) followed by a catalytic amount of 2,2,6,6-tetramethyl-1-piperidinyloxy free radical (TEMPO, 0.0046 g, 0.03 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue (0.096 g) was purified by preparative layer chromatography on silica gel eluting with EtOAc-hexane (3:7) to give the title compound (0.071 g, 77%) as a colorless glass. TLC(EtOAc-hexane; 2:3) Rf=0.60.

Part E: (3S)-3-[N—(N′-(2-tert-Butylphenyl)Oxamyl)Alaninyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxopentanoic Acid

To a solution of (3S)-3-[N—(N′-(2-tert-butylphenyl)oxamyl)alaninyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-oxopentanoic acid, tert-butyl ester (0.071 g, 0.11 mmol) in CH2Cl2(2.5 mL)-anisole(0.05 mL) at room temperature under nitrogen was added trifluoroacetic acid (1.5 mL). The resulting clear solution was stirred at room temperature for 1 hr, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue (0.061 g) was purified by preparative layer chromatography on silica gel eluting with MeOH—CH2Cl2 (1:9) to give the title compound (0.044 g, 69%) as a colorless glass. MS(ES) for C26H27F4N3O7 (MW 569.51): positive 570(M+H); negative 568(M−H).

EXAMPLES 127-178

Starting with (3S,4RS)-3-(alaninyl)amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (see Example 79, Part B) and following the methods described in Example 79, Parts C through E, the compounds shown below in Table 7 were also prepared:

TABLE 7 MS(ES) Ex. R1 Formula MW pos. neg. 127 (2-CF3)Ph C23H18F7N3O7 581.40 604(M+Na) 580(M−H) 128 (2-Ph)Ph C28H23F4N3O7 589.50 612(M+Na) 588(M−H) 129 (2-PhCH2)Ph C29H25F4N3O7 603.53 604(M+H) 602(M−H) 130 (2-PhO)Ph C28H23F4N3O8 605.50 628(M+Na) 604(M−H) 131 (3-PhO)Ph C28H23F4N3O8 605.50 628(M+Na) 604(M−H) 132 5,6,7,8-tetrahydro-1-naphthyl C26H25F4N3O7 567.49 590(M+Na) 566(M−H) 133 1-naphthyl C26H21F4N3O7 563.46 586(M+Na) 562(M−H) 608(M+K) 134 Ph C22H19F4N3O7 513.40 552(M+K) 512(M−H) 135 (2,6-di-F)Ph C22H17F6N3O7 549.38 572(M+Na) 548(M−H) 662(M+TFA) 136 (4-Ph)Ph C28H23F4N3O7 589.50 588(M−H) 137 (4-MeO)Ph C23H21F4N3O8 543.43 582(M+K) 542(M−H) 138 Ph2CH C29H25F4N3O7 603.53 642(M+K) 602(M−H) 139 4-pyridinyl C22H20F4N4O9 560.42 515(M+H) 513(M+H) 140 2-pyridinyl C21H18F4N4O7 514.39 515(M+H) 141 (2-Cl)Ph C22H18ClF4N3O7 547.85 142 (2,3,4,5-tetra-Cl)Ph C22H15F8N3O7 585.36 584(M−H) 143 5-indanyl C25H23F4N3O7 553.47 552(M−H) 144 (2-Br)Ph C22H18BrF4N3O7 592.30 590/592(M−H) 145 (2,3,5,6-tetra-F)Ph C22H15ClF4F4N3O7 651.18 648/650/652 (M−H) 146 1-anthryl C30H23F4N4O7 613.52 636(M+Na) 612(M−H) 147 PhCH2 C23H21F4N3O7 527.43 148 Ph(CH2)2 C24H23F4N3O7 541.46 542(M+H) 540(M−H) 564(M+Na) 149 (2-F)Ph C22H18F5N3O7 531.39 554(M+Na) 530(M−H) 150 (4-F)Ph C22H18F5N3O7 531.39 554(M+Na) 530(M−H) 151 (2-pyrrolidin-1-yl)Ph C28H27F7N4O9 696.53 583(M+H) 581(M−H) 695(M+TFA) 152 (2-morpholin-4-yl)Ph C28H27F7N4O10 712.53 599(M+H) 597(M−H) 711(M+TFA) 153 (2-morpholin-4-yl-5- C29H26F10N4O10 780.53 689(M+Na) 664(M−H) trifluoromethyl)Ph 154 (2-pyrrolidin-1-yl-5- C29H26F10N4O9 764.53 651(M+H) 649(M−H) trifluoromethyl)Ph 673(M+Na) 155 PhCH2 C23H21F4N3O7 527.43 594(M+Na) 590(M−H) 156 Adamantan-1-yl C26H29F4N3O7 571.52 594(M+Na) 570(M−H) 157 cyclo-hexyl C22H25F4N3O7 519.45 558(M+K) 518(M−H) 158 (2-Cl)Ph C22H18ICF4N3O7 547.85 570/572 546/548(M−H) (M+Na) 159 (2,5,di-t-Bu)Ph C30H35F4N3O7 625.61 160 1,2,3,4-tetrahydro-naphthalen- C26H25F4N3O7 567.49 590(M+Na) 566(M−H) 1-yl 161 (4-n-heptyl)Ph C29H33F4N3O7 611.49 634(M+Na) 610(M−H) 162 (2-1)Ph C22H18F4IN3O7 639.30 662(M+Na) 638(M−H) 163 napththalen-1yl-methyl C27H23F4N3O7 577.49 600(M+Na) 576(M−H) 164 pyrrolidin-1-yl C20H22F4N4O7 506.14 507.22 (M+H) 165 1-pyrrolidine C20H21F4N3O7 491.13 509(M+NH4) 492(M+H) 166 1-piperidine C21H23F4N3O7 505.15 504(M+H) 167 piperidin-1-yl C23H28F4N4O9 580.18 519(M−H) 168 (2-tBu-5-AcNH)Ph C28H30F4N4O8 626.2 625(M−H) 169 (2-tBu-5- C45H45F4N5O10 891.31 890(M−H) NH(CO(CH2)3NHGmoc)Ph 170 (2,3,5,6-tetra-F)Ph C21H16F8N4O6 572.09 573(M+H) 171 (2-(3-CH3O-Ph))Ph C29H25F4N3O8 619.16 642(M+Na) 618(M−H) 172 (2-(4-CH3O-Ph))Ph C29H25F4N3O8 619.16 620(M+H) 618(M−H) 173 (2-(2-CH3O-Ph))Ph C29H25F4N3O8 619.16 620(M+H) 618(M−H) 174 (2-(1-naphthyl))Ph C32H25F4N3O7 639.55 662(M+Na) 638(M−H) 175 [2-{(3-CH3)Ph}]Ph C29H25F4N3O7 603.19 626(M+Na) 602(M−H) 176 [2-{(4-CH3)Ph}]Ph C29H25F4N3O7 603.19 626(M+Na) 602(M−H) 177 [2-{(2-CH3)Ph}]Ph C29H25F4N3O7 603.19 626(M+Na) 602(M−H)

EXAMPLE 178

(3S)-3-[N—(N′-(2′-PHENOXYPHENYL)OXAMYL)CYCLOBEXYLALANINYL]AMINO-5-(2′,3′,5′,6′-TETRAFLUOROPHENOXY)-4-OXOPENTANOIC ACID

Part A: (3S)-3-(N-Benzyloxycarbonyl)Amino-5-Bromo-4-Oxopentanoic Acid tert-Butyl Ester

A solution of (N-benzyloxycarbonyl)aspartic acid, β-tert-butyl ester (2.28 g, 7.06 mmol) and N-methylmorpholine (0.85 mL, 7.7 mmol) in tetrahydrofuran (40 mL) at −10° C. (NaCl/ice bath) under nitrogen was treated dropwise via syringe with isobutyl chloroformate (1.11 mL, 8.5 mmol). After stirring at −10° C. for 20 min, the mixture was filtered (sinctered glass) into a pre-cooled receiver (ice bath) washing the filter cake with additional tetrahydrofuran (approx. 10 mL). The combined filtrate was treated with excess diazomethane/Et2O solution (prepared from 3.10 g, 21 mmol of 1-methyl-3-nitro-1-nitrosoguanidine, 20 mL 40% KOH/10 ml Et2O) at 0° C. (ice bath) under nitrogen. After stirring at 0° C. for 15 min and at room temperature for 30 min, the reaction mixture was again cooled to 0° C. and treated with 48% HBr(2.0 mL, 12 mmol)/acetic acid(2.0 mL). After stirring at 0° C. for 15 min and at room temperature for 15 min, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, saturated NaHCO3, and saturated NaCl solutions dried over anhydrous Na2SO4 and evaporated to a dryness. Trituration with hexane gave the crude title compound (3.32 g) as a yellow oil. TLC(EtOAc-hexane; 1:1) Rf=0.60 (intermediate diazoketone Rf=0.52).

Part B: (3S,4RS)-3-W-Benzyloxycarbonyl)Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of (3S)-3-(N-benzyloxycarbonyl)amino-5-bromo-4-oxopentanoic acid tert-butyl ester (0.857 g, 2.14 mmol) and 2,3,5,6-tetrafluorophenol (0.410 g, 2.45 mmol) in dimethylformamide (5.0 mL) at room temperature under nitrogen was added potassium fluoride (0.40 g, 6.9 mmol). After stirring at room temperature for 16 hrs, the mixture was diluted with EtOAc, washed with saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a to give the crude tetrafluorophenoxymethyl ketone (1.08 g, 98%) as a yellow, viscous oil. TLC(EtOAc-hexane; 1:1) Rf=0.57.

To a solution of the above crude ketone (1.08 g, ca 2.14 mmol) in ethanol (10 mL) at 0° C. under nitrogen was added sodium borohydride (0.057 g, 1.5 mmol). After stirring at 0° C. for 1 hr, the excess reducing agent was discharged by treatment with acetone (1.0 mL), the mixture concentrated and the residue partitioned between EtOAc-half saturated NH4Cl solution. The organic phase was washed with saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:3) to give the title compound (1.012 g, 94%) as a colorless oil. TLC(EtOAc-hexane; 1:1) Rf=0.48.

Part C: (3S,4RS)-3-[IN-9-Fluorenylmethoxycarbonyl)Cyclohexylalaninyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of (3S,4RS)-3-(N-benzyloxycarbonyl)amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (1.012 g, 2.08 mmol) in MeOH (25 mL) was added 10% Pd—C (0.30 g) and resulting mixture stirred under a hydrogen atmosphere (balloon) for 4 hrs. The mixture was filtered through Celite washing the filter cake with CH2Cl2 and the combined filtrates evaporated to give the crude amine (0.682 g, 93%) as a viscous oil. TLC(MeOH—CH2Cl2; 5:95) Rf=0.21.

To a solution of (N-9-fluorenylmethoxycarbonyl)cyclohexylalanine (0.763 g, 1.94 mmol) in CH2Cl2(10 mL) at 0° C. (ice bath) under nitrogen was added hydroxybenzotriazole hydrate (0.282 g) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)carbodiimide hydrochloride (0.447 g, 2.33 mmol). After stirring at 0° C. for 10 min, the mixture was treated with the above crude amine (0.682 g, ca 1.93 mmol) and the reaction allowed to warm to room temperature. After stirring at room temperature for 3 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography eluting with EtOAc-hexane (1:2) to give the title compound (1.028 g, 73%) as yellow foam. TLC(EtOAc-hexane; 1:2) Rf=0.20.

Part D: (3S,4RS)-3-[Cyclohexylalaninyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

A mixture of (3S,4RS)-3-[(N-9-fluorenylmethoxycarbonyl)cyclohexylalaninyl]amino-5-(2′,3′, 5′,6′-tetrafluorophenoxy)4-hydroxypentanoic acid tert-butyl ester (1.028 g, 1.4 mmol) and 10% piperidine/dimethylformamide (3.0 mL) was stirred at room temperature under nitrogen for 2 hrs. The mixture was diluted with CH2Cl2, washed with water and saturated NaHCO3 solution, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography eluting with isopropanol-CH2Cl2 (7:93) to give the title compound (0.561 g, 78%) as a white solid. TLC(MeOH—CH2Cl2; 5:95) Rf=0.43.

Part E: (3S,4RS)-3 [—(N′-(2′-Phenoxyphenyl)Oxamyl)Cyclohexylalaninyl]-Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of N-(2-phenoxyphenyl)oxamic acid (0.064 g, 0.25 mmol, prepared from 2-phenoxyaniline by the method described in Example 1, Part A) and (3S,4RS)-3-[cyclohexylalaninyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic Acid tert-butyl ester (0.124 g, 0.245 mmol) in CH2Cl2(5.0 mL) at 0° C. (ice bath) under nitrogen was added hydroxybenzotriazole hydrate (0.051 g) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)carbodiimide hydrochloride (0.061 g, 0.32 mmol). After stirring at 0° C. for 10 min and at room temperature for 18 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give the crude title compound (0.194 g) as yellow foam. TLC(EtOAc-hexane; 1:2) Rf=0.40.

Part F: (3S)-3-[N—(N′-(2′-Phenoxyphenyl)Oxamyl)Cyclohexylalaninyl]-Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxoxypentanoic Acid tert-Butyl Ester

To a solution of crude (3S,4RS)-3-[N—(N′-(2′-phenoxyphenyl)oxamyl) cyclohexylalaninyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.194 g, ca 0.245 mmol) in CH2Cl2 (5 mL) at room temperature under nitrogen was added Dess-Martin Periodinane (0.150 g, 0.35 mmol). After stirring at room temperature for 2 hrs, the mixture was diluted with EtOAc, washed with 1.0 M Na2S2O3, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:3) to give the title compound (0.142 g, 80%) as a colorless, viscous oil. TLC(EtOAc-hexane; 1:2) Rf=0.50.

Part G: (3S)-3-[N—(N′-(2′-Phenoxyphenyl)Oxamyl)Cyclohexylalaninyl]-Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxoxypentanoic Acid

To a solution of (3S)-3-[N—(N′-(2′-phenoxyphenyl)oxamyl)cyclohexylalaninyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-oxopentanoic acid, tert-butyl ester (0.142 g, 0.19 mmol) in CH2Cl2(2.0 mL) at room temperature under nitrogen was added trifluoroacetic acid (1.0 mL). The resulting clear solution was stirred at room temperature for 0.5 hr, evaporated to dryness and chased with toluene-CH2Cl2 (1:1) to give the title compound (0.123 g, 93%) as a white foam. MS(ES) for C34H33F4N3O8 (MW 687.64): positive 688(M+H), 710(M+Na), 726(M+K); negative 686(4-H), 800(M+TFA).

EXAMPLES 179-181

Starting with (3S,4RS)-3-[cyclohexylalaninyl]amino-5-(2′,3′,5′,6′-tetrafluoro-phenoxy)-4-hydroxypentanoic acid tert-butyl ester (see Example 178, Part D) and following the methods described in Example 178, Parts E through G the compounds shown below in Table 8 were also prepared:

TABLE 8 MS(ES) Ex. R1 Formula MW pos. neg. 179 (2-Ph)Ph C34H33F4N3O7 671.64 672(M+H) 670(M−H) 694(M+Na) 784 (M+TFA) 180 (2-PhCH2)Ph C35H35F4N3O7 685.67 708(M+Na) 684(M−H) 798 (M+TFA) 181 1-naphthyl C32H31F4N3O7 645.61 668(M+Na) 644(M−H) 758 (M+TFA)

EXAMPLE 182

(3S)-3-[N—(N′-(5,6,7,8-TETRAHYDRO-1-NAPHTHYL)OXAMYL)-CYCLOHEXYLALANINYL]AMINO-5-(2′,6′-DICHLOROBENZOYLOXY)-4-OXOPENTANOIC ACID

Part A: Aspartic Acid. β-tert-Butyl, α-Methyl Ester p-Toluenesulfonate Salt

To a solution of N-(benzyloxycarbonyl)-L-aspartic acid, β-tert-butyl ester (10.57 g, 32.7 mmol) in methanol(20 mL)-CH2Cl2(30 mL) at 0° C. (ice bath) was added portionwise a 2.0 M solution of (trimethylsilyl)diazomethane in hexanes (20 mL, 40 mmol). After stirring at 0° C. for 45 min, the excess reagent was quenced with formic acid (1.0 mL). The mixture was washed with saturated NaHCO3 solution, dried over anhydrous Na2SO4 and evaporated to a pale yellow oil (11.34 g).

The crude product (11.34 g, ca 32.7 mmol) was taken up in methanol (100 mL), treated with p-toluenesulfonic acid mono hydrate (6.20 g, 32.6 mmol) and 10% Pd—C (0.5 g) and stirred under a hydrogen atmosphere (balloon) for 3 hrs. The mixture was filtered through Celite and concentrated to give the title compound as a white solid (12.68 g).

Part B: [(N-Benzyloxycarbonyl)Cyclohexylalaninyl]Aspartic Acid, β-tert-Butyl, α-Methyl Ester

To a solution of (N-benzyloxycarbonyl)-cyclohexylalanine dicyclohexylamine salt (0.866 g, 1.77 mmol) in CH2Cl2(10 mL) at 0° C. (ice bath) under nitrogen was added hydroxybenzotriazole hydrate (0.100 g) followed by 1-ethyl-3-(3′,3‘-dimethyl-1 ’-aminopropyl)carbodiimide hydrochloride (0.41 g, 2.14 mmol). After stirring at 0° C. for 10 min, the mixture was treated with aspartic acid, β-tert-butyl, α-methyl ester p-toluenesulfonate salt (0.665 g, 1.77 mmol) and N-methylmorpholine (0.2 mL, 1.8 mmol), and the reaction allowed to warm to room temperature. After stirring at room temperature for 2.5 hrs, the mixture was concentrated and the residue partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to an oil. Purification by flash chromatography on silica gel eluting with EtOAc-hexane (1:3) gave the title compound (0.764 g, 88%) as a viscous oil. TLC(EtOAc-hexane; 1:2) Rf=0.46.

Part C: (3S)-3-[N—(N′-(5,6,7,8-Tetrahydro-1-Naphthyl)Oxamyl)-Cyclohexylalaninyl]Amino-5-(2′,6′Dichlorobenzoyloxy)-4-Oxopentanoic Acid

Starting with [(N-benzyloxycarbonyl)cyclohexyl-alaninyl]aspartic acid, β-tert-butyl, α-methyl ester and following the general methods described in Example 4, Parts B through H, gave the title compound as a white solid. MS(ES) for C33H37Cl2N3O8 (MW 674.58): positive 696/698(M+Na); negative 672/674(M−H), 786/788(M+TFA).

EXAMPLES 183-189

Starting with [(N-benzyloxycarbonyl)cyclohexyl-alaninyl]aspartic acid, β-tert-butyl, α-methyl ester (see Example 182, Part B), and following the general methods described in Example 4, Parts B through H, the compounds shown below in Table 9 were also prepared:

TABLE 9 MS(ES) Ex. R1 B Formula MW pos. neg. 183 5,6,7,8- CH2O(2,3,5,6- C32H35F4N3O7 649.64 672(M+Na) 648(M−H) tetrahydro-1- tetra-F-Ph) naphthyl 184 5,6,7,8- CH2OPO(Me) C33H42N3O8P 639.68 662(M+Na) 638(M−H) tetrahydro-1- Ph 752(M+TFA) naphthyl 185 5,6,7,8- CH2OPOPh2 C38H44N3O8P 701.75 724(M+Na) 700(M+H) tetrahydro-1- 740(M+K) naphthyl 186 (2-PhCH2)Ph CH2OPO(Me) C36H42N3O8P 675.72 698(M+Na) 674(M−H) Ph 714(M+K) 788(M+TFA) 187 (2-PhCH2)Ph CH2OPOPh2 C41H44N3O8P 737.79 760(M+Na) 736(M−H) 776(M+K) 850(M+TFA) 188 (2-Ph)Ph CH2OPO(Me) C40H42N3O8P 661.68 684(M+Na) 660(M−H) Ph 700(M+K) 774(M+TFA) 189 (2-Ph)Ph CH2OPOPh2 C35H40N3O8P 723.75 746(M+Na) 722(M−H) 762(M+K) 836(M+TFA)

EXAMPLE 190

(3S)-3-[N—(N′-(1-NAPHTHYL)OXAMYL)HOMOPROLINYL]AMINO-5-(2′,3′, 5′, 6′-TETRAFLUOROPHENOXY)-4-OXOPENTANOIC ACID

Part A: [N-(1-Naphthyl)Oxamyl]hom*oproline

To a solution of N-(1-naphthyl)oxamic acid (0.108 g, 0.50 mmol, see Example 1, Part A) in N-methylpyrrolidone(1.0 mL)-CH2Cl2(1.0 mL) at room temperature under nitrogen was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophate (0.209 g, 0.55 mmol). After stirring for 20 min, the mixture was treated with hom*oproline methyl ester (0.072 g, 0.50 mmol) and diisopropylethylamine (0.26 mL, 1.5 mmol). After stirring at room temperature for 4 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude [N-(1-naphthyl)oxamyl]hom*oproline (0.156 g, 92%) as a colorless glass. TLC (EtOAc-hexane; 1:1) Rf=0.70.

To a solution of the crude methyl ester (0.156 g, ca 0.46 mmol) in dioxane(0.75 mL)-water(0.25 mL) was added 1.0 N LiOH solution (0.5 mL, 0.5 mmol). After stirring at room temperature for 1 hr. the mixture was acidified with 1.0 N HCl and extracted with EtOAc. The extract was washed with saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to give the title compound (0.105 g, 70%) as a white solid after trituration with Et2O.

Part B: (3S,4RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)hom*oprolinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of [N-(1-naphthyl)oxamyl]hom*oproline (0.483 g, 1.48 mmol) in N-methylpyrrolidone(0.5 mL)-CH2Cl2(14 mL) at 0° C. under nitrogen was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophate (0.676 g, 1.78 mmol). After stirring for 20 min, the mixture was treated with a solution of (3S,4RS)-3-amino-5-(2′,3′,5′,6′-tetraflurophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.540 g, 1.54 mmol, see Example 49, Part C) in CH2Cl2 (4.0 mL) followed by diisopropylethylamine (0.50 mL, 2.9 mmol). After stirring at 0° C. for 3 hrs and at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. Purification by flash chromatography on silica gel eluting with EtOAc-hexane (1:2) gave the title compound (0.268 g, 27%) as a tan foam. TLC (EtOAc-hexane; 1:1) Rf=0.39.

Part C: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)hom*oprolinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxoypentanoic Acid tert-Butyl Ester

To a solution of (3S,4RS)-3-[N—(N′-(1-naphthyl)oxamyl)hom*oprolinyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.251 g, 0.38 mmol) in CH2Cl2 (4 mL) at room temperature under nitrogen was added Dess-Martin Periodinane (0.201 g, 0.475 mmol). After stirring at room temperature for 30 min, the mixture was diluted with EtOAc, washed with 1.0 M Na2S2O3, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was purified by flash chromatography on silica gel eluting with CH2Cl2-Et2O-hexane (1:2:2) then EtOAc-hexane (1:2) to give the title compound (0.160 g, 64%) as a white foam. TLC(EtOAc-hexane; 1:1) Rf=0.57.

Part D: (3S,4RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)hom*oprolinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxoypentanoic Acid

To a solution of (3S)-3-[N—(N′-(1-naphthyl)oxamyl)hom*oprolinyl]amino-5-(2′, 3′,5′,6′-tetrafluorophenoxy)-4-oxopentanoic acid tert-butyl ester (0.152 g, 0.23 mmol) in CH2Cl2(1.0 mL)-anisole(0.4 mL) at room temperature under nitrogen was added trifluoroacetic acid (1.0 mL). The resulting clear solution was stirred at room temperature for 1 hr. evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with hexane to give the title compound (0.103 g, 74%) as an off-white solid. TLC(MeOH—CH2Cl2; 1:9) Rf=0.33. MS(ES) for C29H25F4N3O7 (MW 603.53): positive 626(M+Na); negative 602(M−H).

EXAMPLE 191

(3S)-3-[N-(1-NAPHTHYL)OXAMYL)INDOLINE-2-CARBONYL]AMINO-5-(2′,3′,5′,6′-TETRAFLUOROPHENOXY)-4-OXOPENTANOIC ACID

Part A: [N-(1-Naphthyl)Oxamyl]Indoline-2-Carboxylic Acid Ethyl Ester

To a solution of N-(1-naphthyl)oxamic acid (2.37 g, 11 mmol, see Example 1, Part A) in N-methylpyrrolidone(7.0 mL)-CH2Cl2(40 mL) at 0° C. (ice bath) under nitrogen was added 1,1′-carbonyldiimidazole (1.96 g, 12.1 mmol). After stirring at 0° C. for 1.5 hrs and at room temperature for 0.5 hrs, (S)-indoline-2-carboxylic acid ethyl ester hydrochloride (1.25 g, 5.5 mmol) and diisopropylethylamine (1.1 mL, 6.4 mmol) was added. After stirring at room temperature for 18 hrs, the mixture was diluted with EtOAc, washed successively with 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The crude product was purified by flash chromatography on silica gel eluting with CH2Cl2-Et2O-hexane (1:1:3) to give the title compound (0.472 g, 22%) as a pale yellow oil. TLC(CH2Cl2-Et2O-hexane; 1:1:3) Rf=0.48.

Part B: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Indoline-2-Carbonyl]Amino-5-(2′,3′,5′, 6′-Tetrafluorophenoxy)-4-Oxopentanoic Acid

Starting from [N-(1-naphthyl)oxamyl]indoline-2-carboxylic Acid ethyl ester, and following the methods described in Example 104, Parts A through D, the title compound was also prepared. MS(ES) for C32H23F4N3O7 (MW 637.54): positive 660(M+Na),676(M+K); negative 636(M−H),672(M+Cl), 750(M+TFA).

EXAMPLE 192

(3S)-3-[N—(N′-(1-NAPHTHYL)OXAMYL)CYCLOHEXYLGLYCINYL]AMINO-5-(2′,3′,5′,6′-TETRAFLUOROPHENOXY)-4-OXOPENTANOIC ACID

Part A: (3S,4RS)-3-[(N-9-Fluorenylmethoxycarbonyl)Cyclohexylglycinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of (N-9-fluorenylmethoxycarbonyl)cyclohexylglycine (0.514 g, 1.35 mmol) and (3S,4RS)-3-amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.479 g, 1.36 mmol, see Example 92, Part C) in CH2Cl2(10 mL) at 0° C. (ice bath) under nitrogen was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophate (0.619 g, 1.62 mmol) and diisopropylethylamine (0.47 mL, 2.7 mmol). After stirring at 0° C. for 3 hrs, the reaction was allowed to warm to room temperature. After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography eluting with EtOAc-hexane (1:2) to give the title compound (0.481 g, 50%) as a white solid. TLC(EtOAc-hexane; 1:2) Rf=0.42.

Part B: (3S,4RS)-3-[Cyclohexylglycinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

A solution of (3S,4RS)-3-[(N-9-fluorenylmethoxycarbonyl)cyclohexylglycinyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.478 g, 0.67 mmol) in piperidine(0.1 mL)/dimethylformamide(2.0 mL) was stirred at room temperature under nitrogen for 1 hr. The mixture was diluted with EtOAc, washed with water and saturated NaCl solution, dried over anhydrous anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography eluting with EtOAc-hexane (1:2) to give the title compound (0.121 g, 45%) as a white solid. TLC(MeOH—CH2Cl2; 5:95) Rf=0.38.

Part C: (3S,4RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)Cyclohexylglycinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

To a solution of N-(1-naphthyl)oxamic acid (0.088 g, 0.41 mmol, see Example 1, Part A) and (3S,4RS)-3-(cyclohexylglycinyl)amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.110 g, 0.27 mmol) in N-methylpyrrolidone(0.5 mL)-CH2Cl2(3.0 mL) at 0° C. under nitrogen was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophate (0.125 g, 0.32 mmol) and diisopropylethylamine (90 μL, 0.54 mmol). After stirring at 0° C. for 3 hrs and at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:2) to give the title compound (0.094 g, 50%) as a white foam. TLC(EtOAc-hexane; 1:1) Rf=0.50.

Part D: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Cyclohexylglycinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxoypentanoic Acid tert-Butyl Ester

To a solution of (3S,4RS)-3-[N—(N′-(1-naphthyl)oxamyl)cyclohexylglycinyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.082 g, 0.12 mmol) in CH2Cl2(1 mL)-CH3CN(2 mL)-DMSO(0.2 mL) at room temperature under nitrogen was added Dess-Martin Periodinane (0.145 g, 0.34 mmol). After stirring at room temperature for 1 hr, the mixture was diluted with EtOAc, washed with 1.0 M Na2S2O3, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:2 then 1:1) to give the title compound (0.068 g, 83%) as a tan foam. TLC(EtOAc-hexane; 1:1) Rf=0.63.

Part E: (3 S,4RS)-3-[N—(N′-(1-Naphthyl)Oxamyl) Cyclohexylglycinyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxoypentanoic Acid

To a solution of (3S)-3-[N—(N′-(]-naphthyl)oxamyl)cyclohexylglycinyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-oxopentanoic acid tert-butyl ester (0.065 g, 0.23 mmol) in CH2Cl2(1.0 mL)-anisole(0.2 mL) at room temperature under nitrogen was added trifluoroacetic acid (1.0 mL). The resulting clear solution was stirred at room temperature for 30 min, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O to give the title compound (0.034 g, 56%) as an off-white solid. TLC(MeOH—AcOH—CH2Cl2; 1:1:32) Rf=0.45. MS(ES) for C31H29F4N3O7 (MW 631.58): positive 654(M+Na); negative 630(M−H).

EXAMPLES 193-200

Starting from (3S,4RS)-3-amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxy-pentanoic acid tert-butyl ester (see Example 178, Part C) and following the general methods described in Example 192, Parts A through E, the compounds shown below in Table 10 were also prepared:

TABLE 10 MS(ES) Ex. A Formula MW pos. neg. 193 norleucine C29H27F4N3O7 605.54 628(M+Na) 604(M−H) 644(M+K) 640(M+Cl) 718(M+TFA) 194 (t-butyl)glycine C29H27F4N3O7 605.54 606(M+H) 604(M−H) 628(M+Na) 640(M+Cl) 644(M+K) 718(M+TFA) 195 (t-butyl)alanine C20H29F4N3O7 619.57 620(M+H) 618(M−H) 642(M+Na) 732(M+TFA) 658(M+K) 196 phenylglycine C31H23F4N3O7 625.53 626(M+H) 624(M−H) 648(M+Na) 660(M+Cl) 664(M+K) 738(M+TFA) 197 phenylalanine C32H25F4N3O7 639.56 640(M+H) 638(M−H) 662(M+Na) 674(M+Cl) 678(M+K) 712(M+TFA) 198 hom*ophenylalanine C33H27F4N3O7 653.59 654(M+H) 652(M−H) 676(M+Na) 688(M+Cl) 692(M+K) 766(M+TFA) 199 1-aminocyclopentane C29H25F4N3O7 603.53 626(M+Na) 602(M−H) carboxylic acid 642(M+K) 200 histidine C29H23F4N5O7 629.15 630(M+H) 28(M−H)

EXAMPLE 201

(3S)-3-[N-(1-NAPHTHYL)OXAMYL)METHIONINYL(SULFOXIDE)]AMINO-5-(2′,3′,5′,6′-TETRAFLUOROPHENOXY)-4-OXOPENTANOIC ACID

Part A: (3S,4RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)Methioninyl]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Hydroxypentanoic Acid tert-Butyl Ester

Starting from (N-9-fluorenylmethoxycarbonyl)methionine and following the methods described in Example 106, Parts A through C, the title compound was also prepared. TLC(EtOAc-hexane; 1:2) Rf=0.39.

Part B: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)Methioninyl(Sulfoxide)]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxoypentanoic Acid tert-Butyl Ester

To a solution of (3S,4RS)-3-[N—(N′-(1-naphthyl)oxamyl)methioninyl]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-hydroxypentanoic acid tert-butyl ester (0.251 g, 0.37 mmol) in CH2Cl2(4.0 mL) at room temperature under nitrogen was added Dess-Martin Periodinane (0.203 g, 0.48 mmol). After stirring at room temperature for 1 hr, the mixture was diluted with EtOAc, washed with 1.0 M Na2S2O3, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was purified by flash chromatography on silica gel eluting with EtOAc-hexane (1:2 then 1:1) followed by MeOH—CH2Cl2 (5:95 then 1:9) to give a mixture of two isomeric sulfoxides (0.225 g); TLC(MeOH—CH2Cl2; 1:9) Rfs 0.48 and 0.43. The mixture was re-chromatographed on silica gel eluting with isopropanol-CH2Cl2 (2.5% to 5% to 10%) to give sulfoxide isomer A (less polar, 0.051 g), sulfoxide isomer B (more polar, 0.086 g) and a mixture of isomers A and B (0.040 g). Both isomers have virtually identical mass spectra. MS(ES) for C32H33F4N3O8S (MW 695.68): positive 718(M+Na); negative 694(N−H).

Part C: (3S,4RS)-3-[N—(N′-(1-Naphthyl)Oxamyl)Methioninyl(Sulfoxide)]Amino-5-(2′,3′,5′,6′-Tetrafluorophenoxy)-4-Oxoypentanoic Acid

To a solution of (3S)-3-[N—(N′-(1-naphthyl)oxamyl)methioninyl(sulfoxide)]amino-5-(2′,3′,5′,6′-tetrafluorophenoxy)-4-oxopentanoic acid tert-butyl ester (isomer A, 0.046 g, 0.07 mmol) in CH2Cl2(2.0 mL)-anisole(0.1 mL) at room temperature under nitrogen was added trifluoroacetic acid (1.0 mL). The resulting clear solution was stirred at room temperature for 30 min, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O-hexane to give the title compound, isomer A (0.034 g, 81%) as an off-white solid. TLC(MeOH-AcOH—CH2Cl2; 1:1:32) Rf=0.20. MS(ES) for C28H25F4N3O8S (MW 639.57): positive 640(M+H),662(M+Na),678(M+K); negative 638(M−H), 752(M+TFA). Under the same conditions sulfoxide isomer B (0.081 g, 0.12 mmol) gave the title compound, isomer B (0.055 g, 74%). MS(ES) for C28H25F4N3O8S (MW 639.57): positive 640(M+H),662(M+Na),678(M+K); negative 638(M-H),674(M+Cl), 752(M+TFA).

EXAMPLE 202

(3S)-3-[N—(N′-(1-NAPHTHYL)OXAMYL)HOMOPROLINYL]AMINO-4-OXOBUTANOIC ACID

Part A: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)hom*oprolinyl]Amino-4-Oxobutanoic Acid (tert)-Butyl Ester Semicarbazone

To a solution of [N-(1-naphthyl)oxamyl]hom*oproline (0.103 g, 0.32 mmol, see Example 104, Part A) in CH2Cl2 (3.0 mL) at 0° C. under nitrogen was added was added hydroxybenzotriazole hydrate (0.058 g) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)carbodiimide hydrochloride (0.91 g, 0.47 mmol). After stirring at 0° C. for 10 min, the mixture was treated with (3S)-amino-4-oxobutanoic acid (tert)-butyl ester semicarbazone, p-toluenesulfonate salt (0.127 g, 0.32 mmol) and N-methylmorpholine (42 μL, 0.38 mmol). After stirring at 0° C. for 2 hrs, the mixture was concentrated and the residue partitioned between EtOAc-5% KHSO4. The organic phase was washed with 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give the crude title compound (0.119 g, 70%) as a colorless glass.

Part B: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)hom*oprolinyl]Amino-4-Oxobutanoic Acid Semicarbazone

To a solution of (3S)-3-[N—(N′-(1-naphthyl)oxamyl)hom*oprolinyl]amino-4-oxobutanoic acid semicarbazone tert-butyl ester (0.119 g, 0.21 mmol) in CH2Cl2(2.0 mL)-anisole(0.05 mL)-water(0.05 mL) at room temperature under nitrogen was added trifluoroacetic acid (0.32 mL). The resulting clear solution was stirred at room temperature for 18 hrs, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O to give the title compound (0.079 g, 74%) as a white solid.

Part C: (3S)-3-[N—(N′-(1-Naphthyl)Oxamyl)hom*oprolinyl]Amino-4-Oxobutanoic Acid

A suspension of (3S)-3-[N—(N′-(1-naphthyl)oxamyl)hom*oprolinyl]amino-4-oxobutanoic acid semicarbazone (0.079 g, 0.16 mmol) in 37% aqueous formaldehyde(0.6 mL)-acetic acid(0.6 mL)-methanol(1.8 mL) was stirred at room temperature under nitrogen for 18 hrs. The resulting clear solution was diluted with water and mixture concentrated on a rotovap. The aqueous solution was then frozen and lyophilized. The residue was taken up in methanol, filtered through Celite and filtrate evaporated to dryness. Trituration of the residue with Et2O gave the title compound (0.037 g, 53%) as a white solid. MS(ES) for C22H23N3O6 (MW 425.44): positive 448(M+Na); negative 424(M−H).

EXAMPLE 203

(3S)-3-[N—(N′-(2-(1H-TETRAZOL-5-YL)PHENYL)OXAMYL)VALINYL]AMINO-4-OXOBUTANOIC ACID

Part A: 2-(1′-Phenylmethyl-5′-Tetrazolyl)Aniline Hydrochloride

A solution of 2-cyano-acetanilide (0.801 g, 5.0 mmol) and tri-n-butyltin azide (2.05 mL, 7.5 mmol) in anhydrous toluene (10 mL) was heated at reflux for 48 hrs. The mixture was allowed to cool to room temperature and treated with 2.0 N HCl in Et2O (5.0 mL). The resulting precipate was collected by suction, washed with hexane and dried in vacuo to give 2-(1H-tetrazol-5-yl)acetanilide (0.917 g, 90%) as a white solid.

To a suspension of 2-(1H-tetrazol-5-yl)acetanilide (0.203 g, 1.0 mmol) in tetrahydrofuran (2.0 mL) at 0° C. under nitrogen was added triethylamine (0.170 mL, 1.2 mmol) and benzyl bromide (0.125 mL, 1.05 mmol). After stirring at 0° C. for 3 hrs and at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness. The residue was triturated with hexane to give 2-(1′-phenylmethyl-5′-tetrazolyl)acetanilide (0.218 g, 74%) as a white solid. 1H-NMR indicates that the product is a single regioisomer. Assignment of regiochemistry should be considered tentative. 1H-NM(CDCl3): δ 2.22 ppm (3H,s), 5.84 (2H,s), 7.16 (1H, dt, J=7.8, 1.5 Hz), 7.40 (6H, m), 8.19 (1H, dd, J=7.8, 1.5 Hz), 8.63 (1H, d, J=8.4 Hz). 10.58 (1H, bs).

A mixture of 2-(1′-phenylmethyl-5′-tetrazolyl)acetanilide (0.216 g, 0.74 mmol) and 10% aqueous HCl (3.0 mL) was refluxed for 18 hrs. The mixture was evaporated to dryness and the residue triturated with Et2O to give the title compound (0.187 g, 88%) as a white solid.

Part B: N-[2-(1′-Phenylmethyl-5′-Tetrazolyl)Phenyl]Oxamic Acid

To a solution of 2-(1′-phenylmethyl-5′-tetrazolyl)aniline hydrochloride (0.177 g, 0.615 mmol), 4-dimethylaminopyridine (0.008 g, 0.065 mmol) and triethylamine (0.19 mL, 1.4 mmol) in CH2Cl2 (1.0 mL) at 0° C. (ice bath) under nitrogen was added methyl oxalyl chloride (62 μL, 0.67 mmol). After stirring at 0° C. for 2 hrs, the mixture was allowed to come to room temperature, stirred for 18 hrs and then partitioned between EtOAc-5% KHSO4. The organic phase was washed with saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to dryness.

The crude methyl ester (0.207 g, ca 0.615 mmol) was taken up in dioxane (2.0 mL) and treated with 1.0 N LiOH solution (0.68 mL, 0.68 mmol) and stirred at room temperature for 1 hr. The mixture was acidified with 1.0 N HCl and extracted with EtOAc. The extract was washed with saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to dryness. Trituration of the crude product with hexane gave the title compound (0.121 g, 61%) as a white solid.

Part C: (3S)-3-[N—(N′-(2-(1′-Phenylmethyl-5′-Tetrazolyl)Phenyl)Oxamyl)Valinyl]Amino-4-Oxobutanoic Acid Semicarbazone tert-Butyl Ester

To a solution of N-[2-(1′-phenylmethyl-5′-tetrazolyl)phenyl]oxamic acid (0.065 g, 0.20 mmol) in CH2Cl2(2.0 mL) at 0° C. under nitrogen was added hydroxybenzotriazole hydrate (0.037 g) followed by 1-ethyl-3-(3′,3′-dimethyl-1′-aminopropyl)-carbodiimide hydrochloride (0.058 g, 0.30 mmol). After stirring at 0° C. for 10 min, the mixture was treated with (3S)-3-(valinyl)amino-4-oxobutanoic acid (tert)-butyl ester semicarbazone (0.066 g, 0.20 mmol, prepared by the method described for the corresponding leucine analogue in Example 1, Parts B and C) and N-methylmorpholine (26 μL, 0.24 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3 and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give the crude title compound (0.090 g, 62%) as a colorless glass.

Part D: (3S)-3-[N—(N′-(2-(1′H-5′-Tetrazolyl)Phenyl)Oxamyl)Valinyl]Amino-4-Oxobutanoic Acid Semicarbazone tert-Butyl Ester

To a solution of crude (3S)-3-[N—(N′-(2-(1′-phenylmethyl-5′-tetrazolyl)phenyl)oxamyl)valinyl]amino-4-oxobutanoic acid semicarbazone tert-butyl ester (0.089 g, ca. 0.14 mmol) in MeOH (1.0 mL) was added 10% Pd—C (0.009 g) and resulting mixture stirred under a hydrogen atmosphere (balloon) for 48 hrs. The mixture was filtered through Celite washing the filter cake with CH2Cl2 and the combined filtrates evaporated to dryness. The residue was triturated with Et2O to give the title product (0.060 g, 79%) as a white solid.

Part E: (3S)-3-[N—(N′-(2-(1′H-5′-Tetrazolyl)Phenyl)Oxamyl)Valinyl]Amino-4-Oxobutanoic Acid Semicarbazone

To a solution of (3S)-3-[N—(N′-(2-(1′H-5′-tetrazolyl)phenyl)oxamyl)valinyl]amino-4-oxobutanoic acid tert-butyl ester (0.058, 0.11 mmol) in CH2Cl2(1.0 mL)-anisole(0.05 mL) at room temperature under nitrogen was added 6.0 M HCl/AcOH (1.0 mL). The resulting solution was stirred at room temperature for 18 hrs, evaporated to dryness and chased with toluene-CH2Cl2 (1:1). The residue was triturated with Et2O to give the title compound (0.048 g, 92%) as a white solid.

Part F: (3S)-3-[N—(N′-(2-(1′H-5′-Tetrazolyl)Phenyl)Oxamyl)Valinyl]Amino-4-Oxobutanoic Acid

A solution of (3S)-3-[N—(N′-(2-(1′H-5′-tetrazolyl)phenyl)oxamyl)valinyl]amino-4-oxobutanoic acid semicarbazone (0.048 g, 0.10 mmol) in 37% aqueous formaldehyde(0.4 mL)-acetic acid(0.4 mL)-methanol(1.2 mL) was stirred at room temperature under nitrogen for 18 hrs. The resulting clear solution was diluted with water and mixture concentrated on a rototvap. The aqueous solution was then frozen and lyophilized. The residue was taken up in methanol, filtered through Celite and filtrate evaporated to dryness. Trituration of the residue with Et2O gave the title compound (0.025 g, 59%) as a white solid. MS(ES) for C18H21N7O6 (MW 431.41): positive 454(M+Na); negative 430(M−H).

EXAMPLE 204

(3S)-3-[N—(N 1-ADAMANTANYL)OXAMYL)VALINYL]AMINO-4-OXOBUTANOIC ACID

Part A: (3S)-3-[N-(9-Fluorenylmethoxycabonyl)Valinyl]Amino-4-Oxobutanoic Acid (tert-Butyl) Ester Semicarbazonyl-4-[2′-(4-Ethyl-Phenoxyacetyl)]Aminomethylpolystrene

Aminomethylpolystryene resin (10.0 g, 100-200 mesh, 0.71 meq/g) was placed in a 200 mL filter tube equipped with a vacuum stopco*ck and glass frit and washed successively with CH2Cl2(50 mL)/dimethylformamide(50 mL), diisopropylethylamine(5 mL)/dimethylformamide(30 mL), dimethylformamide (2×50 mL) and tetrahydrofuran (30 mL). The resin was suspended in tetrahydrofuran(20 mL)/N-methylpyrolidinone(20 mL) with nitrogen agitation through the bottom of the frit and treated with diiospropylethylamine (1.9 mL, 10.9 mmol) and (3S)-3-(9-fluorenylmethoxycabonyl)amino-4-oxobutanoic acid (tert-butyl)ester semicarbazonyl-4-[2′-(4-ethyl-phenoxyacetic acid)] (2.24 g, 3.56 mmol). After all of the solid had dissolved (approx. 10 min), the mixture was treated with pyBOP [benzotriazolyloxy-tris(N-pyrolidinyl)phosphonium hexafluorophosphate, 2.78 g, 5.34 mmol) in one portion. After mixing by nitrogen agitation for 3 hrs, the supernatant was removed by suction and the resin washed successively with tetrahydrofuran (2×50 mL), dimethylformamide (3×50 mL) and CH2Cl2 (2×50 mL). Unreacted amine groups were capped by treatment with a mixture of acetic anhydride(10 mL)/dimethylformamide(30 mL)/diisopropylethylamine(1.0 mL). After mixing by nitrogen agitation for 1 hr, the supernatant was removed by suction and the resin washed with dimethylformamide(4×50 mL).

The resin was treated with piperidine(10 mL)/dimethylformamide(40 mL) and mixed by nitrogen agitation for 1 hr. The supernatant was removed by suction and the resin washed with dimethylformamide(4×50 mL) and tetrahydrofuran (50 mL).

The resin was suspended in tetrahydrofuran(20 mL)/N-methylpyrolidinone(20 mL), treated with N-(9-fluorenylmethoxycabonyl)valine (3.63 g, 10.7 mmol), diisopropylethylamine (5.7 mL, 32.7 mmol) and pyBOP (8.34 g, 16.0 mmol) and mixed by nitrogen agitation for 2.5 hrs. The supernatant was removed by suction and the resin washed successively with dimethylformamide (3×40 mL) and CH2Cl2 (3×40 mL), methanol (2×40 mL) and Et2O (2×40 mL). The resin was dried in vacuo to give the title product (12.69 g, quantitative). Based on the starting semicarbazone-acid, the resin loading was calculated as approximately 0.28 meq/g.

Part B: (3S)-3-[N—(N′-(1-Adamantanyl)Oxamyl)Valinyl]Amino-4-Oxobutanoic Acid

An aliquot of the Part A resin (0.125 g, ca 0.035 mmol) was placed in a 6 mL Supelco™ filtration tube equipped with a 20 μm polyethylene frit, treated with piperidine-dimethylformamide (1.0 mL, 1:4 v/v) and mixed on an orbital shaker for 1 hr. The supernatant was removed by suction and the resin washed with dimethylformamide (4×1.0 mL) and CH2Cl2 (3×1.0 mL). The resin was treated with 0.5M iPr2NEt in N-methylpyrolidinone (0.40 mL, 0.20 mmol), (1-adamantanyl)oxamic acid (0.0246 g, 0.11 mmol) and 0.25M O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophate in N-methylpyrolidinone (0.40 mL, 0.10 mmol). The mixture was mixed on an orbital shaker under an nitrogen atmosphere for 16 hrs. The supernatant was removed by suction and the resin washed successively with dimethylformamide (3×1.0 mL) and CH2Cl2 (3×1.0 mL), methanol (2×1.0 mL) and Et2O (2×1.0 mL).

The resin was treated with 1.0 mL of CH2Cl2 and allowed to re-swell for 15 min. The solvent was removed by suction and the resin treated with trifluoroacetic acid-CH2Cl2-anisole (1.0 mL, 4:3:1 v/v/v). After mixing on an orbital shaker under nitrogen for 5.5 hrs, the supernatant was removed by suction and the resin washed with CH2Cl2 (4×1.0 mL). The resin was treated with 37% aqueous formaldehyde-acetic acid-tetrahydrofuran-trifluoroacetic acid (1.0 mL, 1:1:5:0.025 v/v/v/v) and mixed on an orbital shaker under nitrogen for 4.5 hrs. The supernatant was collected by suction, the resin washed with tetrahydrofuran (3×0.5 mL). The combined filtrates were blown down under nitrogen. The residue was taken up in methanol (0.5 mL), filtered and applied directly to a 3 mL Supelco™ LC-18 reverse phase extraction tube which had been pre-conditioned with water, and eluted successively with 3 mL each of 10% MeOH-water, 30% MeOH-water, 60% MeOH-water and 90% MeOH-water. The product-containing fractions (TLC) were combined and evaporated to dryness to give the title compound (0.0114 g, 77%) as a colorless glass. TLC(AcOH-MeOH—CH2Cl2; 1:1:20) Rf=0.23. MS(ES) for C21H31N3O6 (MW 421.49): positive 444(M+Na), 460(M+K); negative 420(M−H), 534(M+TFA).

EXAMPLES 205-219

Starting with (3S)-3-[N-(9-fluorenylmethoxycabonyl)valinyl]amino-4-oxobutanoic acid (tert-butyl)ester semicarbazonyl-4-[2′-(4-ethyl-phenoxyacetyl)]aminomethylpolystrene (see Example 204, Part A) and following the methods described in Example 204, Part B, the compounds shown below in Table 11 were also prepared:

TABLE 11 MS(ES) Ex. R1 Formula MW pos. neg. 205 Ph C17H21N3O6 363.37 386(M+Na) 362(M−H) 402(M+K) 206 PhCH2 C18H23N3O6 377.40 400(M+Na) 376(M−H) 207 Ph(CH2)2 C19H25N3O6 391.42 414(M+Na) 390(M−H) 430(M+K) 504(M+TFA) 208 (2-CF3)Ph C18H20F3N3O6 431.37 454(M+Na) 430(M−H) 209 (2-t-Bu)Ph C21H29N3O6 419.48 442(M+Na) 418(M−H) 458(M+K) 532(M+TFA) 210 (2-Ph)Ph C23H25N3O6 439.47 462(M+Na) 438(M−H) 478(M+K) 552(M+TFA) 211 (2-PhCH2)Ph C24H27N3O6 453.49 476(M+Na) 452(M−H) 492(M+K) 566(M+TFA) 212 (2-PhO)Ph C23H25N3O7 455.47 478(M+Na) 454(M−H) 494(M+K) 568(M+TFA) 213 2-naphthyl C21H23N3O6 413.43 436(M+Na) 412(M−H) 452(M+K) 526(M+TFA) 214 1-naphthyl C21H23N3O6 413.43 436(M+Na) 412(M−H) 452(M+K) 526(M+TFA) 215 4-Cl-1-naphthyl C21H22ClN3O6 447.87 470/472(M+Na) 446/448(M−H) 486/488(M+K) 216 5,6,7,8-tetrahydro-1- C21H27N3O6 417.46 440(M+Na) 416(M−H) naphthyl 456(M+K) 530(M+TFA) 217 1,2,3,4-tetrahydro-1- C21H27N3O6 417.46 440(M+Na) 416(M−H) naphthyl 456(M+K) 530(M+TFA) 218 (1-naphthyl)CH2 C22H25N3O6 427.46 450(M+Na) 426(M−H) 466(M+K) 540(M+TFA) 219 2-benzimidazoyl C18H21N5O6 403.39

EXAMPLE 220

N-(5-ACETYLAMINO-2-TERT-BUTYL-PHENYL)-N′-[1-(2-HYDROXY-5-OXO-TETRAHYDRO-FURAN-3-YLCARBAMOYL)-ETHYL]-OXALAMIDE

Part A: 2-tert-Butyl-5-nitro-phenylamine

To H2SO4 (50.0 g, 509.79 mmol) was slowly added 2-tert-Butylaniline (5.0 g, 33.50 mmol). The mixture was stirred at room temperature until it became hom*ogeneous, then was cooled to −10° C. before slow addition of KNO3 in small portions (5.00 g, 49.45 mmol) via a powder addition funnel. After stirring at −10° C. for an hour, the reaction mixture was poured over a small portion of ice in a 250 mL beaker, allowed to stand for 10 min, then filtered and discarded white precipitate. The aqueous solution was neutralized with NH4OH until pH 8-9 (Litmus pH paper) and partitioned between EtOAc/water. The organic phase was washed with water, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to a dryness (brown oil). The brown residue was recrystallized from methanol/water to give the desired compound (4.1 g, 63%) as dark brown crystals. TLC (20% EtOAc/Hexane) Rf=0.66; 1HNMR (CDCl3) δ 7.55 (dd, J=8.4, 2.4 Hz, 1H), 7.46 (d, J=2.7 Hz, 1H), 7.35-7.33 (d, J=8.7 Hz), 4.16 (br.s, 2H), 1.44 (s, 9H).
Part B: N-(2-tert-Butyl-5-nitro-phenyl)-oxalamic acid methyl ester

To a suspension of 2-tert-Butyl-5-nitro-phenylamine (4.04 g, 20.80 mmol) in CH2Cl2 (20 mL) at 0° C. was added 1.1 equiv of Methyl chlorooxoacetate (2.10 mL, 22.88 mmol) and followed by dropwise addition of 1.1 equiv of Et3N (3.19 mL, 22.88 mmol). After stirring at 0° C. and allowing to warm up to room temperature over 4 hrs, the reaction mixture was treated with water (20 mL), stirred for 10 min and then partitioned between EtOAc/water. The organic phase was washed with 0.5N HCl (2×25 mL), and saturated NaCl solution (50 mL), dried over Na2SO4 and evaporated to dryness. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (5-25%) to give the title compound (3.25 g, 56%) as light yellow crystals. TLC (30% EtOAc/Hexane) Rf=0.39; 1HNMR (CDCl3) δ 9.36 (br.s, 11H), 8.97 (d, J=2.4 Hz, 1H), 8.02 (dd, J=9.0, 2.4 Hz, 1H), 7.60 (d, J=9.0 Hz, 1H), 4.03 (s, 3H), 1.52 (s, 9H).
Part C: N-(5-Amino-2-tert-butyl-phenyl)-oxalamic acid methyl ester

To a suspension of N2-tert-Butyl-5-nitro-phenyl)-oxalamic acid methyl ester (1.50 g, 5.32 mmol) in MeOH (100 mL) was added Pd/C 10 mol % (0.10 g). The reaction flask was purged with H2 (1 atm)/vacuum three times, then stirred under H2 (1 atm) at room temperature. After stirring for 45 min, the reaction was filtered through celite and evaporated to dryness. The residue was triturated with hexane to give the title compound (1.12 g, 84%) as a gray solid. TLC (40% EtOAc/Hexane) Rf=0.21; 1HNMR(CDCl3) δ 9.21 (br.s, 1H), 7.47 (d, J=2.4 Hz, 1H), 7.18 (d, J=8.7 Hz, 1H), 6.50 (dd, J=8.4, 2.7 Hz, 1H), 4.00 (s, 3H), 1.42 (s, 9H); MS(ES) for C13H18N2O5 (MW=250.29) positive 251 (MH+).
Part D: N-(5-Acetylamino-2-tert-butyl-phenyl)-oxalamic acid methyl ester

To a suspension of N-(5-Amino-2-tert-butyl-phenyl)-oxalamic acid methyl ester (1.10 g, 4.39 mmol) in pyridine (5 mL) at room temperature was added 1.1 equiv of Acetic anhydride (0.45 mL, 4.83 mmol). After stirring at room temperature for 30 min, the reaction mixture was treated with 0.5N CuSO4 (50 mL), stirred for 5 min and then partitioned between EtOAc/water. The organic phase was washed with 0.5N HCl (2×25 mL), and saturated NaCl solution (50 mL), dried over Na2SO4 and evaporated to dryness to give the tittle compound as a white foam (1.28 g, >98%). TLC (70% EtOAc/Hexane) Rf=0.43; 1HNMR (CDCl3) δ 9.26 (br.s, 1H), 7.90 (d, J=2.4 Hz, 1H), 7.65-7.61 (dd, J=8.7, 2.4 Hz, 1H), 7.47 (br.s, 1H), 7.35 (d, J=8.7 Hz, 1H), 4.10 (s, 3H), 2.16 (s, 3H), 1.44 (s, 9H); MS(ES) for C15H20N2O4 (MW=292.33): positive 293 (MH+).
Part E: N-(5-Amino-2-tert-butyl-phenyl)-oxalamic acid

To a suspension of N-(5-Acetylamino-2-tert-butyl-phenyl)-oxalamic acid methyl ester (1.28 g, 4.38 mmol) in 1,4-Dioxane (5 mL) at room temperature was added 1.05 equiv of 1.0N LiOH (4.60 mL, 4.60 mmol). After stirring at room temperature for 30 min, the reaction mixture was treated with 0.5N HCl (20 mL), stirred for 5 min and then partitioned between EtOAc/water. The organic phase was washed with saturated NaCl solution (50 mL), dried over Na2SO4 and evaporated to dryness. The oily residue was recrystallized from CH2Cl2/Hexane to give the title compound as a white fine crystal (1.74 g, 96%). 1HNMR (DMSO-d6) δ 10.05 (s, 1H), 9.96 (s, 1H), 7.50 (d, J=2.1 Hz, 1H), 7.42 (dd, J=9.0, 2.1 Hz, 1H), 7.33 (d, J=8.7 Hz, 1H), 2.02 (s, 3H), 1.30 (s, 9H); MS(ES) for C14H18N2O4 (MW=278.30): negative 277 ([M−H]).
Part F: (2S)-2-[(5-Acetylamino-2-tert-butyl-phenylaminooxalyl)-amino]-propaneperoxoic acid methyl ester

To a solution of N-(5-Amino-2-tert-butyl-phenyl)-oxalamic acid (0.35 g, 1.36 mmol) in CH2Cl2/1-methyl-2-pyrolidinone (NMP) (1:1) (3 mL) at room temperature under N2 was added 1.5 equiv O-(7-Azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HATU) (0.72 g, 1.89 mmol). The mixture solution was stirred at room temperature under N2 for 45 min before addition of HCl.H-Ala-OMe (0.16 g, 1.51 mmol), followed by Et3N (0.53 mL, 3.78 mmol). After stirring at room temperature for 2 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (20-60%) to give the tittle compound (0.34 g, 74%) as a white solid. TLC (80% EtOAc/Hexane) Rf=0.51; 1HNMR (CDCl3) δ 9.63 (br.s, 1H), 8.11 (d, J=7.8 Hz, 1H), 8.01 (d, J=2,4 Hz, i), 7.60 (dd, J=8.4, 2.1 Hz, 1H), 7.50 (s, 1H), 7.35 (d, J=98.7 Hz, 1H), 4.714.61 (dq, J=15, 7.5 Hz, 1H), 3.80 (s, 3H), 2.15 (s, 3H), 1.55 (d, J=7.2 Hz, 3H), 1.44 (s, 9H). MS(ES) for C18H25N3O6 (MW=363.41): positive 381 ([M+NH4]+).
Part G: (2S)-2-[(5-Acetylamino-2-tert-butyl-phenylaminooxalyl)-amino]-propionic acid

To a suspension of (2S)-2-[(5-Acetylamino-2-tert-butyl-phenylaminooxalyl)-amino]-propionic acid methyl ester (0.32 g, 0.88 mmol) in 1,4-Dioxane (2 mL) at room temperature was added 1.05 equiv of 1.0N LiOH (0.92 mL, 0.92 mmol). After stirring at room temperature for 30 min, the reaction mixture was treated with 0.5N HCl (10 mL), stirred for 5 min and then partitioned between EtOAc/water. The organic phase was washed with saturated NaCl solution (50 mL), dried over Na2SO4 and evaporated to dryness. The oil residue was recrystallized from EtOAc/Hexane to give the title compound as a white fine powder (0.31 g, 99%). 1HNMR (CDCl3) δ 9.66 (s, M1), 8.42 (d, J=8.4 Hz, 11), 8.14 (s, 1H), 7.91 (s, 1H), 7.55-7.52 (dd, J=8.4, 1.8 Hz, 1H), 7.33 (d, J=9.0 Hz, 1H), 4.72-4.63 (q, J=7.5 Hz, 11), 4.20-3.90 (bs, 1H), 2.13 (s, 3H), 1.53 (d, J=7.2 Hz, 3H), 1.41 (s, 3H); MS(ES) for C14H18N2O4 (MW=349.38): negative 348 ([M−H]).
Part H: 3-Benzyloxycarbonylamino-N-methoxy-N-methyl-succinamic acid tert-butyl ester

To a solution of 2-Benzyloxycarbonylamino-succinic acid 4-tert-butyl ester (15.00 g, 46.39 mmol) in CH2Cl2 (150 mL) at 0° C. under N2 was added 1.2 equiv of 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide.HCl (EDAC) (10.67 g, 55.67 mmol) and 1.1 equiv of HOBt.H2O (7.81 g, 51.03 mmol). The mixture was stirred at 0° C. under N2 for 15 min before addition of HCl.HN(OMe)Me (5.88 g, 60.31 mmol), followed by 4-Methylmorpholine (N) (7.65 mL, 69.59 mmol). After stirring at 0° C. to room temperature for 18 hrs, the mixture was partitioned between EtOAc/water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was recrystallized from Et2O/n-Hexane to give the tittle compound (14.61 g, 86%) as a white solid. TLC (50% EtOAc/Hexane) Rf=0.58; 1HNMR (CDCl3) δ 7.34 (m, 5H), 5.64 (d, J=9.3 Hz, 1H), 5.15-5.05 (dd, J=18.3, 12.3 Hz, 2H), 5.05-5.00 (m, 1H), 3.78 (s,

    • 311), 3.22 (s, 1H), 2.74-2.68 (dd, J=15.0, 5.4 Hz, 1H), 2.58-2.51 (dd, J=15.6, 7.2 Hz, 1H, 1.42 (s, 9H). MS(ES) for C18H26N2O6 (MW=366.4): positive 367 (MH+).
      Part I: 3-Benzyloxycarbonylamino-4-oxo-butyric acid tert-butyl ester

To a suspension of 3-Benzyloxycarbonylamino-N-methoxy-N-methyl-succinamic acid tert-butyl ester (10.00 g, 27.29 mmol) in Ethyl ether (200 mL) at −5° C. was added dropwise 0.5 equiv of 1.0M Lithium aluminum hydride (LAH) in ethyl ether (13.65 mL, 13.65 mmol). After stirring at −5° C. to room temperature for 1 hr. the reaction mixture was treated with 5% KHSO4 (200 mL), stirred for 5 min and then partitioned between EtOAc/water. The organic phase was washed with saturated NaCl solution (200 mL), dried over Na2SO4 and evaporated to dryness. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (20-80%) to give the tittle compound (6.00 g, 71%) as a clear oil. TLC (40% EtOAc/Hexane) Rf=0.38; 1HNMR (CDCl3) δ 9.62 (s, 1H), 7.39 (s, 5H), 5.88 (d, J=7.8 Hz, 1H), 5.15 (s, 2H), 4.43-4.37 (dt, J=9.3, 4.5 Hz, 1H), 3.01-2.94 (dd, J=17.4, 4.8 Hz, 1H), 2.80-2.73 (dd, J=17.4, 4.8 Hz, 1H), 1.42 (s, 9H). MS(ES) for C16H21NO5 (MW=307.14): positive 308 (MH+).
Part J: 3-Benzyloxycarbonylamino-4,4-diethoxy-butyric acid tert-butyl ester

To a suspension of 3-Benzyloxycarbonylamino-4-oxo-butyric acid tert-butyl ester (4.46 g, 14.53 mmol) in Ethanol (40 mL) at 0° C. was added 0.20 equiv TsOH.H2O (0.55 g, 2.91 mmol) and followed by dropwise 8.0 equiv of CH(OEt)3 (19.34 mL, 116.25 mmol). After stirring at 0° C. to room temperature for 16 hrs, the reaction mixture was treated with saturated NaHCO3 (100 mL), stirred for 5 min and then partitioned between EtOAc/water. The organic phase was washed with saturated NaCl solution (200 mL), dried over Na2SO4 and evaporated to dryness. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (20%) to give the tittle compound (4.88 g, 88%) as a clear oil. TLC (30% EtOAc/Hexane) Rf=0.33; 1HNMR (CDCl3) δ 7.38 (m, 5H), 5.28 (d, J=9.9 Hz, 1H), 5.15-5.05 (dd, J=18.0, 12.3 Hz, 2H), 4.48 (d, J=3.6 Hz, 1H), 4.21-4.16 (m, 1H), 3.75-3.65 (m, 2H), 3.59-3.47 (m, 2H), 2.59-2.46 (dd, J=15.6, 5.7 Hz, 2H), 1.42 (s, 9H), 1.21-1.16 (t, J=6.9 Hz, 3H).
Part K: 3-Amino-4,4-diethoxy-butyric acid tert-butyl ester

To a suspension of 3-Benzyloxycarbonylamino-4,4-diethoxy-butyric acid tert-butyl ester (0.50 g, 1.31 mmol) in Ethyl acetate (50 mL) at room temperature was added 10 mol % Pd/C (0.05 g). The reaction flask was purged between H2 (1 atm) and vacuum three times before stirring under H2 (1 atm) at room temperature. After stirring at room temperature for 3 hrs, the reaction mixture was filtered through celite and then evaporated to dryness to give the title compound (0.32 g, 98%) as a clear oil. 1HNMR (CDCl3) δ 4.29 (d, J=5.4 Hz, 1H), 3.79-3.67 (m, 2H), 3.61-3.49 (m, 2H), 3.29-3.21 (m, 1H), 2.60-2.53 (dd, J=16.2, 4.2 Hz, 1H), 2.30-2.21 (dd, J=16.2, 9.0 Hz, 1H), 1.46 (s, 9H), 1.25-1.19 (m, 3H).
Part L: (3S)-3-{(2S)-2-[(5-Acetylamino-2-tert-butyl-phenylaminooxalyl)-amino]-propionylamino}-4,4-diethoxy-butyric acid tert-butyl ester

To a solution of (2S)-2-[(5-Acetylamino-2-tert-butyl-phenylaminooxalyl)-amino]-propanepanoic acid (0.16 g, 0.46 mmol) in CH2Cl2/NMP (1:1, 3 mL) at room temperature under N2 was added 1.5 equiv HATU (0.26 g, 0.69 mmol). The mixture was stirred at room temperature under N2 for 45 min before addition of 3-Amino-4,4-diethoxy-butyric acid tert-butyl ester (0.13 g, 0.51 mmol), followed by Et3N (0.19 mL, 1.38 mmol). After stirring at room temperature for 3 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (30-70%) to give the title compound (0.26 g, 99%) as a white foam. TLC (70% EtOAc/Hexane) Rf=0.31; 1HNMR (CDCl3) δ 9.80 (bs, 1H), 8.81 (d, J=8.1 Hz, 1H), 8.54 (s, 1H), 8.00 (d, J=2.1 Hz, 1H), 7.86-7.83 (dd, J=8.7, 2.1 Hz, 1H), 7.37-7.34 (d, J=8.7 Hz, 1H), 6.85 (d, J=8.7 Hz, 1H), 4.61-4.33 (m, 3H), 3.77-3.39 (m, 4H), 2.50-2.46 (dd, J=6.3, 2.4 Hz, 2H), 2.18 (s, 3H). 1.50 (d, J=6.9 Hz, 3H), 1.46 (s, 9H); MS(ES) for C29H46N4O8 (MW=578.70): positive 596 ([M+NH4]+).
Part M: N-(5-Acetylamino-2-tert-butyl-phenyl)-N′-[1-(2-hydroxy-5-oxo-tetrahydro-furan-3-ylcarbamoyl)-ethyl]-oxalamide

The starting material, (3S)-3-{(2S)-2-[(5-Acetylamino-2-tert-butyl-phenylaminooxalyl)-amino]-propionylamino}-4,4-diethoxy-butyric acid tert-butyl ester (0.24 g, 0.42 mmol) was stirred in Water/TFA/CH2Cl2 (1:1:2, 4 mL) at room temperature. After stirring for 2 hrs, the reaction solution was concentrated in vacuo to dryness yielding the crude title compound. The residue was purified by preparative HPLC (C18 column eluding with 10-90% of 0.1% aqueous formic acid/ACN over 60 min) to give the title compound (0.09 g, 46%) as a white solid. MS(ES) for C21H28N4O7 (MW=448.47): positive 449 ([MH+]).

EXAMPLE 221

N-(5-ACETYLAMINO-2-TERT-BUTYL-PHENYL)-N′-[1-(2-ETHOXY-5-OXO-TETRAHYDRO-FURAN-3-YLCARBAMOYL)-ETHYL]-OXALAMIDE

Part A: (2-Ethoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid benzyl ester

To a suspension of 3-Benzyloxycarbonylamino-4,4-diethoxy-butyric acid tert-butyl ester (4.61 g, 12.09 mmol) in 20% anhydrous TFA/CH2Cl2 (20 mL) at room temperature was added Anisole (0.4 mL). After stirring at room temperature for 1 hr. the reaction mixture was evaporated to dryness to give the crude title compounds as a clear oil. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (10-30%) to give:

(2S, 3 S)-2-Ethoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid benzyl ester (1.54 g, 46%) as a clear oil. TLC (30% EtOAc/Hexane) Rf=0.52; 1HNMR (CDCl3) δ 7.38 (m, 5H), 5.40 (br.s, 1H), 5.11 (br.s, 2H), 5.00 (br.s, 2H), 4.21 (t, J=6.6 Hz, 1H), 3.90-3.80 (dd, J=7.2, 2.4 Hz, 1H), 3.66-3.61 (d, J=8.1 Hz, 1H), 2.90-2.81 (dd, J=17.1, 8.4 Hz, 1H), 2.51-2.41 (dd, J=17.4, 10.5 Hz, 1H), 1.24 (t, J=6.9 Hz, 3H). MS (ES) for C14H17NO5 (MW=279.29): positive 278 ([MH+]).

(2R, 3 S)-(2-Ethoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid benzyl ester (0.89 g, 26%) as a clear oil. TLC (30% EtOAc/Hexane) Rf=0.42 1HNMR (CDCl3) δ 7.37 (m, 5H), 5.43 (d, J=5.1 Hz, 1H), 5.11 (br.s, 2H), 5.34 (d, J=9.3 Hz, 1H), 4.61-4.50 (m, 1H), 3.95-3.85 (dq, J=9.3, 6.9 Hz, 1H), 3.68-3.58 (dq, J=9.3, 6.9 Hz, 1H), 2.90-2.81 (dd, J=17.1, 8.4 Hz, 11H), 2.51-2.41 (dd, J=17.4, 10.5 Hz, 11H), 1.24 (t, J=6.9 Hz, 3H). MS(ES) for C14H17NO5 (MW=279.29): positive 278 ([MH+]).
Part B: (4S, 5S)-4-Amino-5-ethoxy-dihydro-furan-2-one

To a suspension of (2S, 3S)-(2-Ethoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid benzyl ester (0.43 g, 1.54 mmol) in Ethyl acetate (50 mL) at room temperature was added 10 mol % Pd/C (0.05 g). The reaction flask was purged between H2 (1 atm) and vacuum three times before stirring under H2 (1 atm) at room temperature. After stirring at room temperature for 3 hrs, the reaction mixture was filtered through celite and then evaporated to dryness to give the title compound (0.21 g, 94%) as a clear oil. 1HNMR (CDCl3) δ 5.17 (d, J=1.2 Hz, 1H), 3.93-3.82 (dq, J=9.6, 7.2 Hz, 1H), 3.67-3.57 (dq, J=9.3, 6.9 Hz, 1H), 2.95-287 (dd, J=17.7, 6.9 Hz, 1H), 2.56-2.19 (dd, J=17.4, 2.7 Hz, 1H), 1.26-1.21 (t, J=7.2 Hz, 3H). MS(ES) for C6H11NO3 (MW=145.16): positive 146 ([MH+]).
Part C: (4S. 5R)-4-Amino-5-ethoxy-dihydro-furan-2-one

To a suspension of (2R, 3S)-(2-Ethoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid benzyl ester (0.22 g, 0.86 mmol) in Ethyl acetate (25 mL) at room temperature was added 10 mol % Pd/C (0.03 g). The reaction flask was purged between H2 (1 atm) and vacuum three times before stirring under H2 (1 atm) at room temperature. After stirring at room temperature for 3 hrs, the reaction mixture was filtered through celite and then evaporated to dryness to give the title compound (0.12 g, 97%) as a clear oil.

1HNMR (CDCl3) δ 5.31 (d, J=5.1 Hz, 1H), 3.98-3.87 (dq, J=9.6, 7.2 Hz, 1H), 3.76-3.59 (m, 2H), 3.52-3.45 (q, J=7.2 Hz, 1H), 2.72-2.64 (dd, J=17.4, 8.1 Hz, 1H), 2.45-2.36 (dd, J=17.1, 10.2 Hz, 11), 1.29-1.24 (t, J=6.9 Hz, 3H). MS(ES) for C6H11NO3 (MW=145.16): positive 146 ([MH+]).
Part D: N-(5-Acetylamino-2-tert-butyl-phenyl)-N′-[1-(2-ethoxy-5-oxo-tetrahydro-furan-3-ylcarbamoyl)ethyl]-oxalamide

To a solution of (2S)-2-[(5-Acetylamino-2-tert-butyl-phenylaminooxalyl)-amino]-propanoic acid (0.24 g, 0.68 mmol) in CH2Cl2/NMP (1:1, 3 mL) at room temperature under N2 was added 1.5 equiv O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HBTU) (0.26 g, 0.69 mmol). The mixture was stirred at room temperature under N2 for 45 min before added (4S, 5S)-4-Amino-5-ethoxy-dihydro-furan-2-one (0.12 g, 0.82 mmol) and followed by Et3N (0.24 mL, 1.70 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was purified by flask column chromatography on silica gel eluding with EtOAc/Hexane (60-80%) to give the title compound (0.14 g, 43%) as a white solid. TLC (100% EtOAc) Rf=0.51; 1HNMR (CDCl3) δ 9.82 (t, J=10.5 Hz, 1H), 8.85-8.44 (m, 2H), 8.00-7.94 (m, 1H), 7.80-7.68 (m, 1H), 7.38-7.34 (m, 1H), 5.41-5.33 (dd, J=22.2, 4.8 Hz, 1H), 4.74-4.63 (m, 1H), 4.59-4.35 (m, 1H), 3.88-3.77 (dq, J=9.6, 7.2 Hz, 1H), 3.70-3.56 (m, 1H), 3.39-3.22 (m, 1H). 3.03-2.88 (ddd, J=18.3, 7.8, 2.4 Hz, 1H), 2.56-2.35 (m, 1H), v 2.19 (s, 3H), 1.57-1.52 (dd, J=7.2, 3.0 Hz, 3H), 1.45 (s, 9H); MS(ES) for C23H32N4O7 (MW=476.52): positive 477 ([MH+]).

EXAMPLE 222

N-(5-ACETYLAMINO-2-TERT-BUTYL-PHENYL)-N′-[1-(2-ETHOXY-5-OXO-TETRAHYDRO-FURAN-3-YLCARBAMOYL)-ETHYL]-OXALAMIDE

To a solution of (2S)-2-[(5-Acetylamino-2-tert-butyl-phenylaminooxalyl)-amino]-propanoic acid (0.08 g, 0.23 mmol) in CH2Cl21NMP (1:1, 1.5 mL) at room temperature under N2 was added 1.5 equiv HBTU (0.13 g, 0.35 mmol). Mixture solution was stirred at room temperature under N2 for 45 nm before added (4S, 5R)-4-Amino-5-ethoxy-dihydro-furan-2-one (0.05 g, 0.35 mmol) and followed by Et3N (0.10 mL, 0.69 mmol). After stirring at room temperature for 18 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (60-90%) to give the title compound (0.10 g, 91%) as a white solid. TLC (100% EtOAc) Rf=0.52; 1HNMR (CDCl3) δ 9.77 (s, 1H), 8.70-8.65 (t, J=8.1 Hz, 1H), 8.48 (s, 1H), 8.00 (s, 1H), 7.82 (d, J=11.4 Hz, 1H), 7.39-7.36 (d, J=8.7 Hz, 1H), 7.06 (d, J=7.5 Hz, 1H), 1H), 4.49 (d, J=5.1 Hz, 1H), 4.78-4.57 (m, 2H), 3.98-3.86 (m, 1H), 3.72-3.57 (m, 1H), 2.49-2.35 (m, 1H), 2.17 (s, 3H), 2.08-1.97 (m, 1H), 1.55 (d, J=7.2 Hz, 3H) 1.46 (s, 9H), 1.28-1.22 (t, J=14.1 Hz, 3H). MS(ES) for C23H32N4O7 (MW=476.52): positive 477([MH+]), 499 ([M+Na]+).

EXAMPLE 223

N-(2-TERT-BUTYL-PHENYL)-N′-[1-(2-ETHOXY-5-OXO-TETRAHYDRO-FURAN-3-YLCARBAMOYL)-ETHYL]-OXALAMIDE

Part A: Methyl 2-(2-tert-Butylphenylamino)-2-oxoacetate

A 3-L, 3-necked round-bottomed flask, equipped with a mechanic stirrer and a thermal probe (under nitrogen) was charged with 2-tert-Butylaniline (109 g, 114 mL, 732 mmoles), triethylamine (81.4 g, 112 mL, 804 mmoles, 1.1 equiv.) and toluene (600 mL). The resulting mixture was stirred at a moderate speed at −30° C. An additon funnel was charged with Methyl chlorooxoacetate (100 g, 816 mmoles, 1.11 equiv.) with toluene (200 mL), and the mixture added to the reaction mixture at such a rate that the internal batch temperature is less than −20° C. After addition, the reaction was warmed to room temperature for an hour, quenched with water, then partitioned between EtOAc/water. The aqueous phase was extracted with EtOAc (200 mL), and the combined organic layers were washed successively with KHSO4 (200 mL), NaHCO3 (sat'd) (200 mL) and brine (200 mL), then dried the organic over MgSO4. The organic phase was concentrated by rotary evaporation, yielding the title compound as a pale yellow solid [Methyl 2-(2-tert-Butylphenylamino)-2-oxoacetate, 160 g, 93.1%]. MP 61.7-63.6° C. IR (KBr) 3409, 2954, 1736, 1724, 1530, 1299, 1166, 766 cm−1; 1H NMR (300 MHz, CDCl3): δ(ppm): 9.20 (br, 1H), 7.97 (dd, J=7.8 Hz, J′=1.8 Hz, 1H), 7.43 (dd, J=7.8 Hz, J′=1.8 Hz, 1H), 7.31-7.16 (m, 2H), 4.00 (s, 3H), 1.47(s, 9H). The product thus obtained can be used directly for the subsequent reaction.
Part B: 2-(2-tert-Butyl phenylamino)-2-oxoacetic acid

A 3-L, 3-necked round-bottomed flask, equipped with a mechanic stirrer and a thermal probe (under nitrogen) was charged with Methyl 2-(2-tert-Butylphenylamino)-2-oxoacetate (154 g, 655 mmoles) and MeOH (1000 mL). The resulting mixture was stirred at a moderate speed at room temperature. A solution of 1N NaOH/MeOH (800 mL) was added dropwise to the reaction mixture via addition funnel. After 1 hour, agitation was stopped, and the suspension transferred to a filtration funnel and filtered to afford a white solid. This solid was then taken up in water (1200 mL) and the pH adjusted to 1.5-2 with addition of conc. HCl with stirring. After mixing for 1 hour, filtration and drying yielded the title compound as a white crystalline mass (127 g, 574 mmoles, 87.6%). TLC (silica F254, 3/1 v/v dichloromethane/MeOH, detection 254 nm) showed one spot and HPLC confirmed that. MP 110.9-112.6° C.; IR (KBr) 3405, 2973, 1688, 1548, 1300, 757 cm−1; 1H NMR (300 MHz, CDCl3): 6 (ppm): 9.37 (br, 1H), 7.91 (dd, J=7.8 Hz, J′=1.8 Hz, 1H), 7.44 (dd, J=7.8 Hz, J′=1.8 Hz, 1H), 7.25 (m, 2H), 1.46 (s, 9H); 13C (300 MHz, CDCl3): δ(ppm): 160.87, 155.24, 141.18, 133.19, 126.92, 126.69, 126.63, 124.24, 34.21, 30.49.
Part C: Methyl(2S)-2({N-[2-(tert-butyl)phenyl]carbamoyl}carbonylamino)propanoate

A 3-L, 3-necked round-bottomed flask, equipped with a mechanic stirrer and a thermal probe (under nitrogen) was charged with the following solids: 2-(2-tert-Butylphenylamino)-2-oxoacetate (70.008 g, 316.402 mmol), alanine methyl ester hydrochloride (44.368 g, 317.862 mmol), hydroxybenzotriazole hydrate (HOBT) (47.324 g, 350.210 mmol), and 1-[3-(Dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (EDAC.HCl) (121.668 g, 635.4 mmol). N,N′-dimethylformamide (DMF) (1250 mL) was added via graduated cylinder, and the reaction mixture stirred to partially dissolve and suspend the solid reagents. N-methylmorpholine (108 mL, 99.36 g, 982 mmol) was then added in one portion via graduated cylinder. After stirring at room temperature for 18 hours, the reaction mixture was partitioned between EtOAc (ca. 600 mL) and 1N HCl (ca. 500 mL). The aqueous phase was washed two times with EtOAc (ca. 300 mL), and the combined organic layers were washed successively with 1N HCl (ca. 300 mL), H2O (ca 300 mL), saturated NaHCO3 (ca. 300 mL), and brine (ca. 300 mL). The resulting pale yellow organic solution was dried over MgSO4, then concentrated to yield a pale yellow crystalline mass (95 g, 97%). TLC: (silica, 1:1 hexanes/EtOAc) Rf: 0.54. MP: 60.1-62.1° C.; IR (KBr) 3284, 1747, 1662, 1503, 1216, 755 cm−1; 1H NMR: (CDCl3, TMS) δ 9.55 (br, 1H), 8.01 (dd, J=7.8 Hz, J′=1.8 Hz, 1H), 7.42 (dd, J=7.8 Hz, J′=2.6 Hz, 1H), 7.15-7.31 (m, 2H), 4.64 (p, J=7.5 Hz, 1H), 3.80 (s, 3H), 1.54 (d, J=7.5 Hz, 3H), 1.46 (s, 9H) ppm.
Part D: (2S)-2-({N-[2-(tert-butyl)phenyl]carbamoyl}carbonylamino)propanoic acid

A 3-L, 3-necked round-bottomed flask, equipped with a mechanic stirrer and a thermal probe (under nitrogen) was charged with methyl(2S)-2-({N-[2-(tert-butyl)phenyl]-carbamoyl}carbonylamino)propanoate (85.0 g, 276.5 mmol), dissolved in dioxane (664 mL) and the resulting solution cooled in an ice water bath to 8° C. as monitored by an internal temperature probe. To this was added 1N LiOH (332 mL) in three approximately equal portions such that the temperature did not exceed 10° C. with stirring. The bath was removed and stirring continued over 2.5 hours (as the reaction comes to room temperature) at which point TLC analysis (silica gel, 1:1 EtOAc/hexanes) of the reaction mixture showed that the starting material had been consumed. The reaction mixture was partitioned between 1N HCl (300 mL) and EtOAc (500 mL) in a 2 L separatory funnel and separated. The aqueous phase tested to pH 1-2 by test strip. The resulting aqueous fraction was washed with three (3) additional portions of EtOAc (3×200 mL), then the organic fractions were combined and washed consecutively with 10% citric acid solution (200 mL) and brine (200 mL). The organic phase was then concentrated to a mobile gold oil and further dried under high vacuum 20 h to yield a crude yellow solid mass (about 90 g, very moist). The solid mass was recrystallized from EtOAc/Hexanes, and dried to afford a highly crystalline white solid (58.545 g, 200 mmol, 72.4%). TLC: (silica, 19:1 CH2Cl2/MeOH) Rf: 0.18; MP: 164.4-166.1° C.; IR (KBr) 3323, 1719, 1677, 1517, 1448, 1248, 762 cm−1; 1H NMR: (300 MHz, CDCl3) δ 9.57 (br, 1H), 8.10 (d, J=7.8 Hz, 1H), 7.97 (dd, J=7.8 Hz, J′=1.8 Hz, 1H), 7.43 (dd, J=7.8 Hz, J′=1.8 Hz, 1H), 7.25-7.30 (m, 1H), 7.15-7.21 (m, 1H), 4.67 (p, J=7.5 Hz, 1H), 1.60 (d, J=7.2 Hz, 3H), 1.46 (s, 9H) ppm; 13C NMR: (300 MHz, CDCl3) δ 175.71, 159.97, 156.33, 140.92, 133.77, 126.79, 126.47, 126.01, 124.01, 48.31, 34.21, 30.42, 17.50; Elemental Analysis: Calcd for C15H20N2O4: C, 61.63; H, 6.90; N, 9.58. Found: C, 61.80; H, 6.95; N, 9.50.
Part E: (3S)-3-{(2S)-2-[(2-tert-Butyl-phenylaminooxalyl)-amino]propionylamino}-4,4-diethoxy-butyric acid tert-butyl ester

To a solution of (2S)-2-[(2-tert-butyl-phenylaminooxalyl)-amino]-propanoic acid (1.20 g, 4.10 mmol) in CH2Cl2/NMP (1:1, 10 mL) at room temperature under N2 was added 1.5 equiv HATU (0.26 g, 6.15 mmol). The mixture solution was stirred at room temperature under N2 for 45 min before addition of 3-Amino-4,4-diethoxy-butyric acid tert-butyl ester (1.01 g, 4.10 mmol), followed by Et3N (1.71 mL, 12.30 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, 5% KHSO4, saturated NaHCO3, and saturated NaCl solutions, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was purified by flask column chromatography on silica gel eluding with EtOAc/Hexane (20%) to give the tittle compound (1.93 g, 90%) as a white foam. TLC (40% EtOAc/Hexane) Rf=0.60; 1HNMR (CDCl3) δ 9.54 (s, 1H), 8.09 (d, J=7.5 Hz, 1H), 8.00 (dd, J=8.1, 1.5 Hz, 11H), 7.42 (dd, J=9.6, 1.5 Hz, 1H), 7.27 (dt, J=7.2, 0.9 Hz, 1H), 7.17 (dd, J=7.8, 1.5 Hz, 1H), 6.52 (d, J=9.0 Hz, 1H), 4.53 (d, J=3.9, 1H), 4.50-4.37 (m, 2H), 3.77-3.64 (m, 2H), 3.60-3.46 (m, 2H). 2.52 (d, J=6.9 Hz, 2H), 1.51-1.42 (m, 12H), 1.29-1.16 (m, 6H); MS(ES) for C27H13N3O7 (MW=521.66): negative 521([M−H]).
Part F: (2-tert-Butyl-phenyl)-N′-[1-(2-hydroxy-5-oxo-tetrahydro-furan-3-ylcarbamoyl)-ethyl]-oxalamide

(3S)-3-{(2S)-2-[(2-tert-Butyl-phenylaminooxalyl)-amino]-propionylamino}-4,4-diethoxy-butyric acid tert-butyl ester (1.39 g, 2.66 mmol) was stirred in Water/TFA/CH2Cl2 (30 mL, 1:1:2) at room temperature. After stirring for 2 hrs, the reaction solution was concentrated in vacuo until dryness to give crude title compound. The residue was purified by preparative HPLC (C18 column eluding with 30-90% of 0.1% aqueous formic acid/ACN over 60 min) to give the title compound (0.91 g, 87%) as a white solid. LCMS for C19H25N3O6 (MW=391.42): negative 390.32 ([MH]). Purity assay using reverse phase Zorbax C8 4.6×150 mm Rx column over 30 min., with retention time t=10.75 min.

EXAMPLE 225

N-(2-TERT-BUTYL-PHENYL)-N′-[1-(2-ETHOXY-5-OXO-TETRAHYDRO-FURAN-3-YLCARBAMOYL)-ETHYL]-OXALAMIDE

To a solution of (2S)-2-[(2-tert-Butyl-phenylaminooxalyl)-amino]-propanoic acid (1.00 g, mmol) in CH2Cl12/NMP (1:1, 3 mL) at room temperature under N2 was added 1.5 equiv HBTU (0.26 g, 3.42 mmol). Mixture solution was stirred at room temperature under N2 for 45 min before added (4S, 5S)-4-Amino-5-ethoxy-dihydro-furan-2-one (0.42 g, 2.86 mmol) and followed by Et3N (1.20 mL, 8.58 mmol). After stirring at room temperature for 16 hrs, the mixture was partitioned between EtOAc-water. The organic phase was washed with water, then brine, dried over anhydrous Na2SO4 and evaporated to give crude title compound. The residue was purified by flask column chromatography on silica gel eluting with EtOAc/Hexane (10-40%) to give the title compound (0.53 g, 44%) as a white solid. TLC (50% EtOAc/Hexane) Rf=0.45; 1HNMR (CDCl3) δ 9.52 (s, 1H), 7.95 (m, 2H), 7.43 (dd, J=7.8, 1.5 Hz, 1H), 7.31-7.25 (dt, J=7.2, 1.2 Hz, 1H), 7.22-7.16 (dt, J=7.5, 1.5 Hz, 1H), 6.88 (d, J=6.9 Hz, 1H), 5.37 (s, 1H), 4.50-4.39 (m, 2H), 3.89-3.79 (dq, J=9.6, 7.2 Hz, 11), 3.69-3.59 (dq, J=9.3, 6.6 Hz, 1H), 3.07-2.98 (dd, J=18.0, 7.5 Hz, 1H). 2.39-2.33 (dd, J=19.5, 1.2 Hz, 1H), 1.50 (d, J=7.2 Hz, 1H), 1.46 (s, 9H), 1.23 (t, J=7.2 Hz, 3H); LCMS for C21H29N3O6 (MW=419.47): negative 418 (MH), positive 420 ([MH+]).

EXAMPLES 226-312

Starting with (3S)-3-[N-(9-fluorenylmethoxycarbonyl)alanyl]amino-4-oxobutanoic acid (tert-butyl)ester semicarbazonyl-4[2′-(4-ethyl-phenoxyacetyl)]aminomethylpolystene (see Example 204, Part A) and following the methods described in Example 204, Part B, or by the procedures set forth in Examples 220-225, the compounds shown below in Table 12 were prepared:

TABLE 12 MS(ES) Ex. R1 Formula MW Pos neg 226 (4-Ac)Ph C17H19N3O7 377.35 376(M−H) 227 (4-OH)Ph C15H17N3O7 351.32 228 (3,5-di-Cl-4-OH)Ph C15H15Cl2N3O7 420.21 418/420(M−H) 229 (3-CF3)PhCH2 C17H18F3N3O6 417.34 230 (2-F)PhCH2 C16H18FN3O6 367.33 231 (2,4-di-Cl)Ph C17H19Cl2N3O6 432.26 232 (3,4-di-OCH3)Ph C18H23N3O8 409.40 233 CH3 C10H15N3O6 273.25 234 S-(1-naphthyl)CH(CH3) C21H23N3O6 413.43 235 R-(1-naphthyl)CH(CH3) C21H23N3O6 413.43 236 (2-(1-naphthyl))Ph C25H23N3O6 461.47 484 (M+Na) 460(M−H) 237 5-Ph-3-pyrazolyl C18H19N5O6 401.38 400(M−H) 238 5,6,7,8-tetrahydro-1- C19H23N3O6 389.41 naphthyl 239 Ph2CH C22H23N3O6 425.44 240 (2-I)Ph C15H16IN3O6 461.21 241 (2,3,5,6-tetra-Cl)Ph C15H13Cl4N3O6 473.10 242 (4-Ph)Ph C21H21N3O6 411.41 243 (2-PhO)Ph C21H21N3O7 427.41 244 2-naphthyl C19H19N3O6 385.38 245 1,2,3,4-tetrahydro-1- C19H23N3O6 389.41 naphthyl 246 1-naphthylCH2 C20H21N3O6 399.40 247 1-adamantyl C19H27N3O6 393.44 248 4-pyridyl C14H16N4O6 336.30 249 (2,3,4,5,6-penta-F)Ph C15H12F5N3O6 425.27 250 (2-F-4-I)Ph C15H15FIN3O6 479.20 251 1,1,3,3-tetramethylbutyl C17H29N3O6 371.43 252 Ph(CH2)2 C17H21N3O6 363.37 253 n-heptyl C16H27N3O6 357.41 254 (4-n-heptyl)Ph C22H31N3O6 433.50 255 (2,5-di-tBu)Ph C23H33N3O6 447.53 256 (2-PhCH2)Ph C22H23N3O6 425.44 257 (2-pyrrolidin-1yl-5-CF3)Ph C20H23F3N4O6 472.42 258 2,3,5,6-tetra-F-4-pyridyl C14H12F4N4O6 408.27 259 (2-Ph)Ph C21H21N3O6 411.41. 450(M+K) 410(M−H) 260 (3,4,5-tri-Cl)Ph C15H14Cl3N3O6 438.65 261 (4-OCH3)Ph C16H19N3O7 365.34 262 PhNH(CS)NH C16H18N4O6S 394.40 263 (2,4-di-Br)Ph C15H15Br2N3O6 493.11 264 6-quinolinyl C18H18N4O6 386.36 265 (3,4,5-tri-OCH3)PhCH2 C19H25N3O9 439.42 266 (4-CH3)Ph C16H19N3O6 349.34 372(M+Na) 348(M−H) 267 (2-F)Ph C15H16FN3O6 353.31 268 (2-Br-4-Cl-6-F)Ph C15H14BrClFN3O6 466.65 269 PhCH2 C16H19N3O6 349.34 348(M−H) 270 Ph C15H17N3O6 335.32 271 (2,6-di-F)Ph C15H15F2N3O6 371.30 272 (2,3,4,6-tetra-F)Ph C15H13F4N3O6 407.28 273 (2,4-di-Cl)Ph C15H15Cl2N3O6 404.21 402/404(M−H) 274 (2-CF3)Ph C16H16F3N3O6 403.31 426(M+Na) 402(M−H) 275 5-indanyl C18H21N3O6 375.38 276 (3-OPh)Ph C21H21N3O7 427.41 277 4-Cl-1-naphthyl C19H18ClN3O6 419.82 458/460(M+K) 418/420(M−H) 278 1,4-benzodioxan-6-yl C17H19N3O8 393.35 279 (2-Cl)Ph C15H16ClN3O6 369.76 368/370(M−H) 280 (2-Br)Ph C15H16BrN3O6 414.21 414/416(M+H), 412/414(M−H), 434/436(M+Na), 526/528(M+TFA) 452/454(M+K) 281 1-naphthyl C19H19N3O6 385.38 282 (2-tBu)Ph C19H25N3O6 391.42 390(M−H) 283 (2-tBu-5-NHAc)Ph C21H28N4O7 448.48 449(M+H) 284 5-isoquinolinyl C18H18N4O6 386.36 387(M+H) 385(M−H) 285 1-indanyl C18H21N3O6 375.38 286 (2-F)Ph(CH2)2 C17H20FN3O6 381.36 287 (2,4-di-F)PhCH2 C16H17F2N3O6 385.32 408(M+Na) 384(M−H), 498 (M+TFA) 288 (2,4-di-Cl)PhCH2 C16H17Cl2N3O6 418.23 289 PhNNH C21H22N4O6 426.43 290 PhCONH C16H18N4O7 378.34 291 PhCH2(Ph)N C22H24N4O6 440.46 292 Ph(Me)N C16H20N4O6 364.36 439 (M-H) 293 PhSO2 C15H17N3O8S 399.38 294 PhCH2O C16H19N3O7 365.34 295 (2,6-di-Cl)Ph C15H16Cl2N4O6 419.22 296 (4-Me)Ph C16H20N4O6 364.36 297 Ph2NCONH C22H23N5O7 469.45 298 (4-Cl)Ph C15H17ClN4O6 384.78 384/386(M+H) 383/385(M−H) 299 (4-NO2)PhCONH C16H17N5O9 423.34 300 (2,4-di-NO2)PhNH C15H16N6O10 440.33 301 PhNHCONH C16H19N5O7 393.36 302 (2-NO2)PhCONH C16H17N5O9 423.34 303 (2,3,4,5,6-penta-F)PhNH C15H13F5N4O6 440.28 304 (4-Br)PhNH C15H17BrN4O6 429.23 305 (4-NO2)PHCHN C16H17N5O8 407.34 406(M−H) 306 PhNH C15H18N4O6 350.33 349(M−H) 307 (2,3,5,6-tetra-F)PhNH C15H14F4N4O6 422.29 421(M−H) 308 (4-F)PhNH C15H17FN4O6 368.32 367(M−H) 309 (3-Cl-4-Me)PhNH C16H19ClN4O6 398.80 397/398/399 397(M−H) (M+H) 310 (3-Cl)PhNH C15H17FN4O6 368.32 367(M−H) 311 3-[2-ethyl- C19H21N5O7 431.40 4(3H)]quinazolinonyl 312 (3-Br)PhCONH C17H21BrN4O7 473.28 471 (M−H)

EXAMPLES 313-318

By the procedures disclosed in Examples 226-312, but starting with the corresponding tertiary amine, the compounds shown below in Table 13 were also prepared:

TABLE 13 MS(ES) Ex. (R1)(R1′)N— Formula MW Pos neg 313 (1-naphthyl)(Me)N— C20H21N3O6 399.40 314 Ph2N— C21H21N3O6 411.41 315 1-pyrrolidine C20H21F4N3O7 491.13 509 (M + NH4) 429 (M + H) 316 1-piperidine C21H23F4N3O7 505.15 504 (M + H) 317 (1-naphthyl)(Me)N— C20H21N3O6 399.40 318 Ph2N— C21H21N3O6 411.41

EXAMPLES 319-394

By the procedures disclosed in Examples 22, but starting with 2-(9H-flouren-9ylmethoxycarbonylamino)-succinic acid 4-tert-butylester and the appropriate alcohol, the compounds shown below in Table 14A were also made:

TABLE 14A Ex. R1 R1′ R2 Formula MW MS(ES) 319 5-AcNH-2- H ethyl C23H32N4O7 476.53 477(M + H), tBuPh 499(M + Na) 320 2-BrPh H ethyl C11H20BrN3O6 422.27 480/482 (M + K), 464/466 (M + Na), 442/444 (M + H) 321 2-BnPh H ethyl C24H27N3O6 453.49 476 (M + Na), 492(M + K)

By the above procedures, the compounds listed in Table 14B may also be made.

TABLE 14A Ex. R1 R1′ R2 322 2-trifluoromethyl-Ph H methyl 323 2-BzPh H benzyl 324 2-trifluoromethyl-Ph H ethyl 325 1-naphthyl methyl methyl 326 1-naphthyl methyl methyl 327 2-trifluoromethyl-Ph H tBu 328 methylPh H H 329 PhPh H methyl 330 PhPh H ethyl 331 3,4-dimethoxyBr H methyl 332 3,4-dimethoxyBr H ethyl 333 1-naphthalen-1-yl-ethyl H methyl 334 1-naphthalen-1-yl-ethyl H ethyl 335 3,4,5-trimethoxyPh H methyl 336 3,4,5-trimethoxyPh H ethyl 337 2-(2-F-Ph)-ethyl H methyl 338 2-(2-F-Ph)-ethyl H ethyl 339 1-naphthyl H methyl 340 1-naphthyl H ethyl 341 2-methyl Ph H H 342 2,6-diF-Ph H methyl 343 2,6-diF-Ph H ethyl 344 2,6-diF-Ph H tBu 345 2,6-diF-Ph H Bn 346 Br H ethyl 347 Br H methyl 348 Br H tBu 349 Br H Bn 350 2,4-diF-Ph H tBu 351 2-PhPh H tBu 352 2-BrPh H tBu 353 1-naphthalen-1-yl-ethyl H tBu 354 2-trifluromethylPh H tBu 355 3,4,5-trimethoxy-Ph H tBu 356 3-trifluormethylPh H tBu 357 2-(2-F-Ph)-ethyl H tBu 358 1-naphthyl H tBu 359 2-I-Ph H methyl 360 2-I-Ph H ethyl 361 2-I-Ph H tBu 362 2-I-Ph H Bn 363 2-Br-Ph H methyl 364 2-Br-Ph H ethyl 365 2-Br-Ph H tBu 366 2-Br-Ph H Bn 367 1-napthyl methyl Bn 368 3-trifluoromethylPh H Bn 369 3-trifluoromethylPh H methyl 370 3-trifluoromethylPh H ethyl 371 PhCH(Ph) H methyl 372 PhCH(Ph) H ethyl 373 PhCH(Ph) H Bn 374 Ph Ph Bn 375 Ph Ph ethyl 376 Ph Ph methyl 377 2-BrPh H methyl 378 2-trifluoromethylPh H Bn 379 2-tBuPh H methyl 380 2-Ph-Ph H Bn 381 3,4-dimethoxyPh H Bn 382 1-naphthalin-1-yl-ethyl H Bn 383 3,4,5-trimethoxyPh H Bn 384 2-(3-F-Ph)-ethyl H Bn 385 1-naphthyl H Bn 386 2,4-diF-Br H Bn 387 2,4-diF-Br H tBu 388 2,4-diF-Br H ethyl 389 2,4-diF-Br H methyl 390 Br H tBu 391 3,4-dimethoxy-Br H tBu 392 1-naphthyl methyl tBu 393 PhCH(Ph) H tBu 394 Ph Ph tBu

EXAMPLES 395-397

By the procedurees disclosed in Examples 193-200, but starting with (N-9-flourenylmethoxycarbonyl)-tert-butyl glycine, the compounds shown below in Table 15

TABLE 15 MS(ES) Ex. R1 Formula MW Pos neg 395 5-indanyl C28H29F4N3O7 595.5466 594(M + H) 396 (2,3,5,6-tetra-Cl)Ph C25H21Cl4F4N3O7 693.2624 690/692/694 (M − H) 397 (2-Br)Ph C25H24BrF4N3O7 634.3781 632/634(M − H)

EXAMPLES 398-419

By the procedures disclosed in Examples 5-21, but starting with the appropriate amino acid and oxamic acid, the compounds shown in Table 16 were also made:

TABLE 16 MS(ES) Ex. R1 R2 A B Formula MW pos neg 398 (2-tBu)Ph OtBu valine CH2O(2,3,5,6- C23H39F4N3O7 653.27 676(M + Na) 652(M − H) tetra-F—Ph) 399 (2-tBu)Ph OCH3 valine CH2O(2,3,5,6- C29H33F4N3O7 611.58 634(M + Na) 610(M − H) tetra-F—Ph) 646(M + Cl—) 400 5-quinolin-1- OH valine OPOPh2CH2 C35H34F3N3O10P 758.2 yl 401 (2-Ph)Ph OH alpha-methyl- CH2O(2,3,5,6- C35H29F4N3O7 679.19 702(M + Na) phenylalanine tetra-F—Ph) 718(M + JK) 402 (2-tBu)Ph OCH2Ph alanine CH2O(2,3,5,6- C33H33F4N3O7 659.62 660(M + H) 568(M − H) tetra-F—Ph) 403 (2-Br)Ph CH2O(2,3,5, valine OH C24H22BrF4N3O7 619.06 618/620 6- tetraF—Ph) (M − H) 404 (2,3,4,5-tetra- CH2O(2,3,5, valine OH C24H19F8N3O7 613.11 612(M − H) F)Ph 6- tetraF—Ph) 405 (2-tBu)Ph OCH2Ph alanine CH2O(2,3,5,6- C33H32BrF4N3O7 737.14 737.88/739.8 735.90/737.90 tetra-F-4-Br)Ph (M + H) (M − H) 406 (2-tBu)Ph OH histidine CH2O(2,3,5,6- C29H29F4N3O7 635.2 636(M + H) tetra-F—Ph) 407 (2-CF3)Ph OCH2Ph alanine CH2O(2,3,5,6- C30H24F7N3O7 671.15 672(M + H) 670(M − H) tetra-F—Ph) 408 (2-tBu)Ph OH Cys(CH2Ph) CH2O(2,3,5,6- C33H33F4N3O8 675.22 674(M − H) tetra-F—Ph) 409 (2-tBu)Ph OH Cys CH2O(2,3,5,6- C26H27F4N4O7 585.17 584(M − H) tetra-F—Ph) 410 (2-tBu)Ph OH tryptophan CH2O(2,3,5,6- C34H32F4N4O7 684.22 683(M − H) tetra-F—Ph) 411 (2-tBu)Ph OH lysine CH2O(2,3,5,6- C29H34F4N4O7 626.24 625(M − H) tetra-F—Ph) 412 2-(2CH3O— OCH2Ph alanine CH2O(2,3,5,6- C36H31F4N3O8 709.2 Ph)Ph tetra-F—Ph) 413 piperidin-1-yl OCH2Ph alanine CH2O(2,3,5,6- C28H30F4N4O7 610.21 611(M + H) tetra-F—Ph) 414 pyrrolidin-1-yl OCH2Ph alanine CH2O(2,3,5,6- C24H30F4N4O7 596.19 597.28 yl tetra-F—Ph) (M + H) 415 Cbz OH valine CH2O(2,3,5,6- C26H25F4N3O9 599.15 622(M + Na) 598(M − H) tetra-F—Ph) 416 5-indanyl OH (t-butyl) CH2O(2,3,5,6- C28H29F4N3O7 595.55 594(M − H) glycine tetra-F—Ph) 417 (2,3,5,6-tetra- OH (t-butyl) CH2O(2,3,5,6- C25H21Cl4F4N3O7 693.26 690/692/694 Cl)Ph glycine tetra-F—Ph) (M − H) 418 (z-Br)Ph OH (t-butyl) CH2O(2,3,5,6- C25H24BrF4N3O7 634.38 632/634 glycine tetra-F—Ph) (M − H) 419 2-(2- OCH2Ph alanine CH2O(2,3,5,6- C36H31F4N3O8 709.2 710(M + H) 708(M − H) CH3Oph)Ph tetra-F—Ph)

EXAMPLES 420-426

By the procedures disclosed in Example 126, but starting with intermediates having the desired stereochemistry, the compounds shown in Table 17 were also made:

TABLE 17 Ala Asp MS(ES) Ex. R2 stereochemistry stereochemistry Formula MW pos neg 420 OBn R R C33H33F4N3O7 659.62 660(M + H) 658(M − H) 421 OBn R S C33H33F4N3O7 659.62 660(M + H) 658(M − H) 422 OBn S R C33H33F4N3O7 659.62 660(M + H) 658(M − H) 423 H S S C35H29F4N3O7 569.5 570(M + H) 568(M − H) 424 H R R C33H33F4N3O7 569.5 570(M + H) 568(M − H) 425 H R S C24H22BrF4N3O7 569.5 570(M + H) 568(M − H) 426 H S R C24H19F8N3O7 569.5 570(M + H) 568(M − H)

Although the invention has been described with reference to the examples provided above, it should be understood that various modifications can be made without departing from the spirit of the invention. Accordingly, the invention is limited only by the claims.

US Patent Application for C-terminal modified oxamyl dipeptides as inhibitors of the ICE/ced-3 family of cysteine proteases Patent Application (Application #20050020504 issued January 27, 2005) (2024)
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