INHIBITORS OF CYSTEINE PROTEASE

Abstract: This invention relates to compounds of formula (I), wherein A is C(O) or CH(OH); R<1> is (1), (2), (3) or (4); R<2> is H, C1-6alkyl, C3-6cycloalkyl-C0-6alkyl, Ar-C0-6alkyl, Het-C0-6alkyl, R<5>C(O)-, R<5>C(S)-, R<5>SO2-, R<5>OC(O)-, R<5>R'NC(O)-, R<5>R'NC(S)-, adamantyl-C(O)-, or (5); R" is H, C1-6alkyl, Ar-C0-6alkyl, or Het-C0-6alkyl; R"' is H, C1-6alkyl, C3-6cycloalkyl-C0-6alkyl, Ar-C0-6alkyl, or Het-C0-6alkyl; each R<3> independently is H, C2-6alkenyl, C2-6alkynyl, Het, Ar or C1-6alkyl optionally substituted by OR', SR', NR'2, R'NC(O)OR<5>, CO2R', CO2NR'2, N(C=NH)NH2, Het or Ar; R<4> is H, C1-6alkyl, C3-6cycloalkyl-C0-6alkyl, Ar-C0-6alkyl, Het-C0-6alkyl, R<5>C(O)-, R<5>C(S)-, R<5>SO2-, R<5>OC(O)-, R<5>R'NC(O)-, R<5>R'NC(S)-, R'HNCH(R')C(O)-, or R<5>OC(O)NR'CH(R')C(O)-; each R<5> independently is C3-6cycloalkyl-C0-6alkyl, Ar-C0-6alkyl, Het-C0-6alkyl, Ar-C0-6alkoxy, Het-C0-6alkoxy, or C1-6alkyl optionally substituted by OR', SR', NR'2, R'NC(O)OR<5>, CO2R', CO2NR'2, N(C=NH)NH2, Het or Ar; R<6> is H, C1-6alkyl, Ar-C0-6alkyl, or Het-C0-6alkyl and R<7> is H, C1-6alkyl, C3-6cycloalkyl-C0-6alkyl, Ar-C0-6alkyl, Het-C0-6alkyl, R<5>C(O)-, R<5>C(S)-, R<5>SO2-, R<5>OC(O)-, R<5>R'NC(O)-, R<5>R'NC(S)-, R'HNCH(R')C(O)-, or R<5>OC(O)NR'CH(R')C(O)-; or R<6> and R<7> are connected to form a pyrrolidine, a piperidine, or a morpholine ring; each R' independently is H, C1-6alkyl, Ar-C0-6alkyl, or Het-C0-6alkyl; R* is H, C1-6alkyl, C3-6cycloalkyl-C0-6alkyl, Ar-C0-6alkyl, or Het-C0-6alkyl; Y is a single bond or O; each Z independently is CO or CH2; and n is 0, 1, or 2; or a pharmaceutically acceptable salt thereof, which are inhibitors of cysteine proteases, particularly cathepsin K, and are useful in the treatment of diseases in which inhibition of bone loss is a factor.

Description: INHIBITORS OF CYSTEINE PROTEASE Field of the Invention This invention relates to novel protease inhibitors, particularly inhibitors of cysteine and serine proteases, more particularly compounds which inhibit cysteine proteases, even more particularly compounds which inhibit cysteine proteases of the papain superfamily, yet more particularly compounds which inhibit cysteine proteases of the cathepsin family, most particularly compounds which inhibit cathepsin K Such compounds are particularly useful for treating diseases in which cysteine proteases are implicated, especially diseases of excessive bone or cartilage loss, e g , osteoporosis, peπodontitis, and arthritis Background of the Invention Cathepsin K is a member of the family of enzymes which are part of the papain superfamily of cysteine proteases Cathepsins B, H, L, N and S have been described in the literature Recently, cathepsin K polypeptide and the cDNA encoding such polypeptide were disclosed in U S Patent No 5,501 ,969 (called cathepsin O therein) Cathepsin K has been recently expressed, purified, and characterized Bossard, M J , et al , ( 1996) J Biol Chem 271, 12517- 12524, Drake, F H . et al , ( 1996) 7 Biol Chem 271, 1251 1 - 12516, Bromme, D , et al , (1996) J Biol Chem 271, 2126-2132 Cathepsin has been variously denoted as cathepsin O, cathepsin X or cathepsin 02 in the literature The designation cathepsin K is considered to be the more appropriate one (name assigned by Nomenclature Committee of the International Union of Biochemistry and Molecular Biology) Cathepsins of the papain superfamily of cysteine proteases function in the normal physiological process of protein degradation in animals, including humans, e g , in the degradation of connective tissue However, elevated levels of these enzymes in the body can result in pathological conditions leading to disease Thus, cathepsins have been implicated in various disease states, including but not limited to, infections by pneumocystis caπnii, trypsanoma cruzi, trypsanoma brucei brucei, and Cπthidia fusiculata, as well as in schistosomiasis malaria, tumor metastasis, metachromatic leukodystrophy, muscular dystrophy, amytrophy, and the like See International Publication Number WO 94/04172, published on March 3, 1994, and references cited therein See also European Patent Application EP 0 603 873 A 1 , and references cited therein Two bacterial cysteine proteases from P gingivalhs, called gingipains, have been implicated in the pathogenesis of gingivitis Potempa, J , et al ( 1994) Perspectives in Dittg Disc overv and Design, 2, 445- 458 Cathepsin K is believed to play a causative role in diseases of excessive bone or cartilage loss Bone is composed of a protein matrix in which spindle- or plate-shaped crystals of hydroxyapatite are incorporated Type I Collagen represents the major structural protein of bone comprising approximately 90% of the structural protein The remaining 10% of matrix is composed of a number of non-collagenous proteins, including osteocalcin, proteoglycans, osteopontin, ostconectin, thrombospondin, fibronectin, and bone sialoprotein Skeletal bone undergoes remodeling at discrete foci throughout life These foci, or remodeling units, undergo a cycle consisting of a bone resorption phase followed by a phase of bone replacement Bone resorption is carried out by osteoclasts, which are multinuclear cells of hematopoietic lineage The osteoclasts adhere to the bone surface and form a tight sealing zone, followed by extensive membrane ruffling on their apical (l e , resorbing) surface This creates an enclosed extracellular compartment on the bone surface that is acidified by proton pumps in the ruffled membrane, and into which the osteoclast secretes proteolytic enzymes The low pH of the compartment dissolves hydroxyapatite crystals at the bone surface, while the proteolytic enzymes digest the protein matrix In this way, a resorption lacuna, or pit, is formed At the end of this phase of the cycle, osteoblasts lay down a new protein matrix that is subsequently mineralized In several disease states, such as osteoporosis and Paget's disease, the normal balance between bone iesorption and formation is disrupted, and there is a net loss of bone at each cycle Ultimately, this leads to weakening of the bone and may result in increased fracture risk with minimal trauma The abundant selective expression of cathepsin K in osteoclasts strongly suggests that this enzyme is essential for bone resorption Thus, selective inhibition of cathepsin K may provide an effective treatment for diseases of excessive bone loss, including, but not limited to, osteoporosis, gmgival diseases such as gingivitis and peπodontitis, Paget's disease, hypercalcemia of malignancy, and metabolic bone disease Cathepsin K levels have also been demonstrated to be elevated in chondroclasts of osteoarthntic synovium Thus, selective inhibition of cathepsin K. may also be useful for treating diseases of excessive cartilage or matrix degradation, including, but not limited to, osteoarthπtis and rheumatoid arthritis Metastatic neoplastic cells also typically express high levels of proteolytic enzymes that degrade the surrounding matrix Thus, selective inhibition of cathepsin K may also be useful for treating certain neoplastic diseases It now has been discovered that a novel class of compounds are protease inhibitors, most particularly inhibitors of cathepsin K, and these compounds are useful for treating diseases in which inhibition of bone resorption is indicated, such as osteoporosis and periodontal disease. Summary of the Invention An object of the present invention is to provide protease inhibitors, particularly such inhibitors of cysteine and serine proteases, more particularly such compounds which inhibit cysteine proteases, even more particularly such compounds which inhibit cysteine proteases of the papain superfamily, yet more particularly such compounds which inhibit cysteine proteases of the cathepsin family, most particularly such compounds which inhibit cathepsin K, and which are useful for treating diseases which may be therapeutically modified by altering the activity of such proteases. Accordingly, in the first aspect, this invention provides a compound according to formula (I). In another aspect, this invention provides a pharmaceutical composition comprising a compound according to formula (I) and a pharmaceutically acceptable carrier. In yet another aspect, this invention provides a method of treating diseases in which the disease pathology may be therapeutically modified by inhibiting proteases, particularly cysteine and serine proteases, more particularly cysteine proteases, even more particularly cysteine proteases of the papain superfamily, yet more particularly cysteine proteases of the cathepsin family, most particularly cathepsin K. In a particular aspect, the compounds of this invention are especially useful for treating diseases characterized by bone loss, such as osteoporosis and gingival diseases, such as gingivitis and periodontitis, or by excessive cartilage or matrix degradation, such as osteoarthritis and rheumatoid arthritis. Detailed Description of the Invention The present invention provides compounds of formula (I): wherein: A is C(O) or CH(OH); R 1 is R 2 is H, Cι _ 6 alkyl, C 3-6 cycloalkyl-C 0 _ 6 alkyl, Ar-C 0-6 alkyl, Het-C 0 _ 6 alkyl, R 5 C(0)-, R 5 C(S)-, R 5 S0 2 -, R 5 OC(0)-, R 5 R'NC(0)-, R-^R'NC(S)-, adamantyl-C(O)-, or R° N Z . R' R 3 R" is H, Ci . alkyl, Ar-Cθ-6alkyl, or Het-Co-6al yl; R"' is H, C j .βalkyl, C 3 _6cycloalkyl-Co_6alkyl, Ar-C Q .galkyl, or Het-Cø.^alkyl; each R^ independently is H, C2-6 a 'kenyl, C2-6 a 'kynyl, Het, Ar or C j-^alkyl optionally substituted by OR', SR', NR' 2 , R'NC(0)OR 5 , C0 2 R\ C0 2 NR'2, N(C=NH)NH 2 , Het or Ar; R 4 is H, C galkyl, C 3 . 6 cycloalkyl-C () . 6 alkyl, Ar-CQ-ό l l, Het-C 0 . 6 alkyl, R 5 C(0)-, R 5 C(S)-, R 5 S0 -, R 5 OC(0)-, R 5 R'NC(0)-, R 5 R'NC(S)-, R'HNCH(R')C(0)-, or R 5 OC(0)NR'CH(R')C(0)-; each R independently is C 3 _6cycloalkyl-Cr j -6alkyl, Ar-Cf .^alkyl, Het-Crj^alkyl, Ar-C () _6alkoxy, Het-C _6alkoxy, or Cι .6alkyl optionally substituted by OR', SR', NR'2, R'NC(0)OR 5 , C0 2 R', C0 2 NR' 2 , N(C=NH)NH 2 , Het or Ar; R 6 is H, C j . 6 alkyl, Ar-Cθ-6alkyl, or Het-C 0 . 6 alkyl and R 7 is H, Cj.galkyl, C 3 . 6 cycloalkyl-C 0 .6alkyl, Ar-C 0 _6alkyl, Het-C 0 _6alkyl, R 5 C(0)-, R 5 C(S)-, R 5 S0 2 -, R 5 OC(0)-, R 5 R'NC(0)-, R 5 R'NC(S)-, R'HNCH(R')C(0)-, or R 5 OC(0)NR'CH(R')C(0)-; or R" and R ' are connected to form a pyrrolidine, a piperidine, or a morpholine ring; each R' independently is H, Ar-C()-6aIkyl, or Het-C()-6 a lky R* is H, C | _6alkyl, C _6cycloalkyl-Co. a 'kyl. Ar-Co-6 a lkyl, or Het-Co-6 a lkyl; Y is a single bond or O; each Z independently is CO or CH2; and or a pharmaceutically acceptable salt thereof The present invention includes all hydrates, solvates, complexes and prodrugs of the compounds of this invention Prodrugs are any covalently bonded compounds which release the active parent drug according to formula (I) in vivo If a chiral center or another form of an isomeπc center is present in a compound of the present invention, all forms of such isomer or isomers, including enantiomers and diastereomers, are intended to be covered herein Inventive compounds containing a chiral center may be used as a racemic mixture, an enantiomerically enriched mixture, or the racemic mixture may be separated using well-known techniques and an individual enantiomer may be used alone In cases in which compounds have unsaturated carbon-carbon double bonds, both the cis (Z) and trans (E) isomers are within the scope of this invention In cases wherein compounds may exist in tautomeπc forms, such as keto-enol tautomers, each tautomeπc form is contemplated as being included within this invention whether existing in equilibrium or predominantly in one form The meaning of any substituent at any one occurrence in formula (I) or any subformula thereof is independent of its meaning, or any other substituent's meaning, at any other occurrence, unless specified otherwise With respect to formula (I) Preferably, A is C(O) Suitably, R 1 is Particularly, in said R ' group, R' is H or CH 3 , R 3 is l-butyl and R 4 is R 5 C(0)-, R 5 S0 2 -, R 5 OC(0)-, preferably, R 5 is Ar-C 0 . 6 alkyl or Het-Co-galkyl In particular, in said R ' group, R- is phenyl or benzyl which are unsubstituted or substituted by one or two of the group consisting of Cl, Br, F, CF 3 , Cι _ 4 alkyl, OH, Cι _ 4 alkoxy, CN, CONH 2 , NH 2 , or N0 2 , or substituted by methylenedioxy, or Alternately, R 1 is Suitably, R 2 is . Suitably, in said R 2 group, R 6 is H or CH 3 , R 3 is i-butyl and R' is R^OC(O)- wherein R-> in said R ' group is Ar-C Q -^alkyl or Het-C Q .galkyl. In particular, in said R' group, R is phenyl or benzyl which are unsubstituted or substituted by one or two of the group consisting of Cl, Br, F, CF 3 , C]. alkyl, OH, Cι_ 4 alkoxy, CN, CONH 2 , NH 2 , or N0 2 , or substituted by methylenedioxy; or 2-, 3-, or 4-pyridyl-CH2". Alternately, R 2 is in which X is CO, S0 2 , or CH2-CO and Y is a single bond or O Alternately, R 2 is C 3 .6cycloalkyl-Crj-6alkyl, Ar-C 0 .6alkyl, Het-C () _6alkyl, R 5 C(0)-, R 5 C(S)-, R 5 S0 2 -, R 5 OC(0)-, R NC(O)-, R 5 R'NC(S)-, R'HNCH(R')C(0)-, R 5 OC(0)NR'CH(R')C(0)-, or adamantyl-C(O)- Specific representative compounds of this invention are named in Examples 1 - 198 detailed and claimed hereinafter Abbreviations and symbols commonly used in the peptide and chemical arts aie used herein to describe the compounds of the present invention In general, the amino acid abbreviations follow the IUPAC-IUB Joint Commission on Biochemical Nomenclature as described in Eur J Biochem , 158, 9 (1984) The term "amino acid" as used herein refers to the D- or L- isomers of alanine, arginine, asparagmc, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine and valine "Ci -6alkyl" as applied herein is meant to include substituted and unsubstituted methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl and t-butyl, pentyl, n-pentyl, isopentyl, neopentyl and hexyl and the simple aliphatic isomers thereof Any C | -6alkyl group may be optionally substituted independently by one or two halogens, SR', OR', N(R')2, C(0)N(R')2 > carbamyl or C ) . alkyl, where R' is H or Chalky I Cgalkyl means that no alkyl group is present in the moiety Thus, Ar-Cøalkyl is equivalent to Ar "C3-6cycloalkyl" as applied herein is meant to include substituted and unsubstituted cyclopropane, cyclobutane, cyclopentane, and cyclohexane "C2-6 alkenyl" as applied herein means an alkyl group of 2 to 6 carbons wherein a carbon-carbon single bond is replaced by a carbon-carbon double bond C2-6alkenyl includes ethylene, 1 -propene, 2-propene, 1-butene, 2-butene, isobutene and the several lsomeπc pentenes and hexenes Both cis and trans isomers are included "C2-6 a lkynyl" means an alkyl group of 2 to 6 carbons wherein one carbon-carbon single bond is replaced by a carbon-carbon triple bond C2-6 alkynyl includes acetylene, I- propyne, 2-propyne, 1 -butyne, 2-butyne, 3-butyne and the simple isomers of pentyne and hexyne "Halogen" or "halo" means F, Cl, Br, and I "Ar" or "aryl" means unsubstituted phenyl or naphthyl, or phenyl or naphthyl substituted by one or more of Ph-Cø.^alkyl. Het-Cø. 0 alkyl, C j . β alkoxy, Ph-Cø.^alkoxy, Het-Cø.galkoxy, OH, (CH 2 ) I _6NR'R', 0(CH2) i -6NR R', wherein each R independently is H, C j .galkyl, Ar-Cø.f,alkyl, or Het-Cø.galkyl, or phenyl or naphthyl substituted by one to three moieties selected from C i - alkyl, OR', N(R')„ SR', CF„ NO,, CN, CO 2 R', CON(R'), F, Cl, Br and I, oi substituted by a methylenedioxy group As used herein "Het" or "heterocyclic" represents a stable 5- to 7-membered monocyclic or a stable 7- to 10-membered bicyclic heterocyclic ring, which is either saturated or unsaturated, and which consists of carbon atoms and from one to four heteroatoms selected from the group consisting of N, O and S, and wherein the nitrogen and sulfur heteroatoms may optionally be oxidized, and the nitrogen heteroatom may optionally be quatermzed, and including any bicyclic group in which any of the above-defined heterocyclic rings is fused to a benzene ring The heterocyclic ring may be attached at any heteroatom or carbon atom which results in the creation of a stable structure, and may optionally be substituted with one or two moieties selected from C ] -4 alkyl, OR', N(R')2. SR', CF 3 , N0 2 , CN, C0 2 R\ CON(R"), F, Cl, Br and I, where R is as defined hereinbefore Examples of such heterocycles include pipeπdinyl, piperazinyl, 2-oxopιperazιnyl, 2- oxopipeπdinyl, 2-oxopyrrolodιnyl, 2-oxoazepιnyl, azepinyl, pyrrolyl, 4-pιpeπdonyl, pyrrolidinyl, pyrazolyl, pyrazohdinyl, lmidazolyl, pyridyl, pyrazinyl, oxazolidinyl, oxazolinyl, oxazolyl, isoxazolyl, morpholinyl, thiazohdinyl, thiazolmyl, thia/olyl, quinuchdinyl, indolyl, quinolinyl, isoquinolinyl, benzimidazolyl, benzopyranyl benzoxazolyl, furyl, pyranyl, tetrahydrofuryl, tetrahydropyranyl, thienyl, benzoxazolyl, thiamorphohnyl sulfoxide, thiamorpholinyl sulfone, oxadiazolyl, benzothiazolyl, benzoisothiazolyl, benzisoxazolyl, pyπmidinyl, cinnolinyl, quinazohnyl, quinoxahnyl, 1 ,5- napthyndinyl, 1 ,6-napthyndιnyl, 1 ,7-napthyrιdιnyl, 1 ,8-napthyπdιnyl, tetrazolyl, 1 ,2,3- tnazolyl, and 1,2,4-tπazolyl "HetAr" or "heteroaryl" means any heterocyclic moiety encompassed by the above definition of Het which is aromatic in character, e g , pyπdinyl, quinolinyl, isoquinolinyl, pyrrolyl, pyrazolyl, lmidazolyl, pyridyl, pyrazinyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, indolyl, quinolinyl, isoquinolinyl, benzimidazolyl, benzoxazolyl, furyl, thienyl, benzoxazolyl, oxadiazolyl, benzothiazolyl, benzoisothiazolyl, benzisoxazolyl, pyπmidinyl, cinnolinyl, quinazohnyl, quinoxahnyl, 1 ,5-napthyπdιnyl, 1 ,6- napthyndinyl, 1,7- napthyndinyl, 1 ,8- napthyndinyl, tetrazolyl, 1,2,3-tπazolyl, and 1 ,2,4-tπazolyl Certain radical groups are abbreviated herein t-Bu refers to the tertiary butyl radical, Boc or BOC refers to the t-butyloxycarbonyl radical, Fmoc refers to the fluorenylmethoxycarbonyl radical, Ph refers to the phenyl radical, Cbz or CBZ refers to the benzyloxycarbonyl radical Certain reagents are abbreviated herein DCC refers to dicyclohexylcarbodnmide, DMAP is 2,6-dιmethylamιnopyπdιne, EDC or EDCI refers to N-ethyl- N'(dιmethylamιnopropyl)-carbodnmιde HOBT or HOBt refers to 1 -hydroxybenzotriazole, DMF refers to dimethyl formamide, BOP refers to benzotrιazol- 1 -yloxy- tπs(dιmethylamιno)phosphonιum hexafluorophosphate, DMAP is dimethylaminopyridine, DIEA refers to di-isopropylethylamine, Lawesson's reagent is 2,4-bιs(4-methoxyphenyl)- 1 ,3-dιthιa-2,4-dιphosphetane-2,4-dιsulfιde, NMM is N-methylmorphohne, TFA refers to trifluoroacetic acid, TFAA refers to tπfluoroacetic anhydride, KHMDS refers to potassium hexamethyldisilazide, and THF refers to tetrahydrofuran Jones reagent is a solution of chromium tπoxide, water, and sulfuπc acid well-known in the art The compounds of formula (I) are generally prepared using a process which comprises (A) for compounds in which A is CH(OH) (i) reacting a compound of the formula (III) or a salt thereof, wherein R' , R", R'" and n are as defined in formula (I), with any reactive functional groups protected, with (a) R^C(0)C1, in which R^is as defined in formula (I), or (b) R 5 C(0)OH, in which R 5 ιs as defined in formula (I), in the presence of EDC and HOBT, or (c) R^C(0)H, in which R^is as defined in formula (I), followed by reduction; or (d) R50C(0)CI, in which R 5 ιs as defined in formula (I), in the presence of base, or (e) as defined in formula (I), in the presence of base, or (f) and R 7 are as defined in formula (I); or (g) adamantyl-C(O)Cl; (ii) reacting a compound of the formual (IV): wherein R 2 , R'" and n are as defined in formula (I), with any reactive functional groups protected, with: (a) , in which R 3 , R 4 and R' are as defined in formula (I), in the presence of EDC and HOBT; or (b) in which R* is as defined in formula (I), in the presence of EDC and HOBT; or (c) O in which Y is as defined in formula (I), in the presence of EDC and HOBT; or (iii) reacting a compound of the formual (V): wherein R'" and n are as defined in formula (I), with any reactive functional groups protected, and R d is Cj ^alkyl, C3_6cycloaIkyl-Cø.6alk l, Ar-Cø_6alkyl, or Het-C Q -galkyl with (a) R 4 and R' are as defined in formula (I), in the presence of EDC and HOBT, or (b) , in which R* is as defined in formula (I), in the presence of EDC and HOBT, or (c) , in which Y is as defined in formula (I), in the presence of EDC and HOBT, or (B) for compounds in which A is C(O) (0 reacting a compound of the formual (VI) wherein R' , R 2 , R", R'" and n are as defined in formula (I), with any reactive functional groups protected, with an oxidizing agent, and thereafter removing any protecting groups and optionally forming a pharmaceutically acceptable salt. Compounds of the formula (I) are prepared by methods analogous to those described in Schemes 1 -5 Scheme 1 Ar a) di-/ -butyl dicarbonate, CH2CI2; b) m-chloroperoxybenzoic acid, CH2CI2; c) NaN 3 , NH C1, CH 3 OH:H 2 O (8: 1); d) 10% Pd/C, CH3OH, H 2 ; e) RCO 2 H, EDC, HOBt, CH C1 2 ; f) HCl/EtOAc or TFA, CH 2 C1 2 ; g) RC0 2 H, EDC, HOBt, CH 2 CI 2 or RCOCI, TEA, CH 2 C1 2 , TEA; h) Cr0 3 , HOAc or DMSO, (COCl)2, CH2CI2, TEA, -78°C to RT or DMSO, sulphur trioxide pyridine comple, TEA Compounds of the general formula (I) wherein n is 0 01 1 , R ' and R 2 are amides and R is hydrogen are prepared as outlined in Scheme 1 Treatment of the commercially available 3-pyrrolιne ( 1 -Scheme- 1. n = 0 ) or 1 ,2,3,6-tetrahydropyπdιne ( 1 -Scheme- 1. n = 1 ) under conditions which are known in the art for nitrogen protection, such as dwe/f-butyl dicarbonate, gave 2-Scheme- l (n = 0, 1 ) 2-Scheme-l is epoxidized by standard conditions, such as meta-chloroperoxybenzoic acid, to provide the epoxide 3-Scheme- l (n = 0, 1 ) The epoxide 3-Scheme- l may be opened with sodium azide in a protic solvent, such as methanol and water, at an elevated temperature to give the azido alcohol 4-Scheme- 1 The azide 4-Scheme- l may be reduced to the amine 5-scheme- l by methods that are common to the art, such as hydrogen with palladium on carbon as a catalyst, in a protic solvent, such as methanol or ethanol The amine 5-Scheme- l is acylated under standard conditions with EDC, HOBt and a carboxyhc acid in an aprotic solvent, such as dichloromethane or DMF, to give 6-scheme- 1 The amine 5-Scheme- l may also be acylated with an acid chloride in the presence of an organic base such as tπethylamine or N-methyl morpholine in an aprotic solvent such as dichloromethane to give the amide derivative 6-Scheme- 1 The amine 5-Scheme- l may also be suphonylated to give the sulphonamide via methods that are known in the art such as treatment with a sulphonyl chloride, in the presence of an organic base, such as N-methylmorphohne, in an aprotic solvent such as dichloromethane Removal of the protecting group of 6-Scheme- l may be accomplished by treatment with a strong acid, such as anhydrous hydrochloric acid or tπflouroacetic acid, in an anhydrous aprotic solvent, such as ethyl acetate or dichloromethane, to give 7-Scheme- l The amine or amine salt of 7-Scheme- l may be acylated under standard conditions, such as EDC, HOBt and a carboxyhc acid or with an acid chloride, to give amide derivatives 8-Scheme- 1 (n = 0, 1 ) The amine 7-Scheme- l may also be alkylated by treatment with an aldehyde in an aprotic solvent, such as dichloromethane, followed by reduction with sodium cyanoborohydπde or sodium tπacetoxyborohydπde Alternatively, the amine 7-Scheme-l may also be converted to the carbamate by treatment with a chloroformate in the presence of base, such as tπethylamine or pyridine The amine 7-Scheme- l may also be converted to the sulphonamide by treatment with a sulphonyl chloride in the presence of a base The alcohol derivatives 8-Scheme- l may be oxidized to the ketone 9-Scheme- l under standard conditions such as chromium tπoxide in acetic acid, in a solvent, such as acetone These alcohols may also be oxidised with methylsulfoxide and oxalyl chloride in an aprotic solvent, such as dichlormethane at -78°C, followed by treatment with an organic base, such as tπethylamine, and warming to room temperature Altenatively, the alcohols may be oxidised with pyridine sulphur tπoxide complex in methylsulphoxide with an organic base, such as tπethylamine Scheme 2 a) m-chloroperoxybenzoic acid, CH 2 CI 2 ; b) NaN 3 , NH4CI, CH3θH:H 2 0 (8: 1 ); c) 1 ,3-propanedilhiol, TEA, CH3OH; d) RC0 2 H, EDC, HOBt, CH2CI2; e) pyridine sulphur trioxide complex, DMSO, TEA Compounds of the formula (I) wherein n is 1 , R ' and R 2 are amides and R is hydrogen may also be prepared as detailed in Scheme 2. Coupling of 1 ,2,3,6- tetrahydropyridine with a carboxyhc acid in the presence of EDC and HOBT or with an acid chloride provides the amide l-Scheme-2. Epoxidation of l-Scheme-2 with m- chloroperoxybenzoic acid yields the epoxide 2-Scheme-2 which is opened with sodium azide in the presence of ammonium chloride to provide the azido alcohol 3-Scheme -2. The azide is then reduced under standard conditions which are known in the art, such as 1 ,3- propanedithiol with triethylamine, in a protic solvent, such as methanol, to provide the amino alcohol 4-Scheme-2. Coupling of the amine 4-Scheme-2 with a carboxyhc acid in the presence of EDC and HOBT provides 5-Scheme-2 which is oxidised by methods which are known in the art, such as DMSO, oxalyl chloride and triethylamine at low temperature, to yield the ketone 6-Scheme-2. Scheme 3 a) BnOC(0)Cl, pyridine or TEA, CH 2 CI 2 ; b) HCI, EtOAc; c) RCHO, TEA, CH 2 C1 2 , sodium triacetoxyborohydride; d) H2, ammonium formate, palladium black; e) RCO2H, EDC, HOBT, DMF; f) sulphur trioxide pyridine complex, DMSO, TEA Compounds of the formula (I) wherein n is 1 , R XS amide, R is hydrogen and R 2 is alkyl, may be synthesised as detailed in Scheme 3. Acylation of the amino alcohol J^ Scheme-3 with a chloroformate, such as benzyl chloroformate, in the presence of pyridine or triethylamine in an aprotic solvent, such as dichloromethane, provides 2-Scheme 3. Removal of the nitrogen protecting group from the secondary nitrogen by methods which are known in the art provides the amine 3-Scheme-3. This amine may be alkylated by treatment with an aldehyde followed by treatment with a reducing agent, such as sodium cyanoborohydnde or sodium tnacetaoxyborohydride, to yield 4-Scheme-3. Removal of the benzyloxycarbonyl protecting group via methods that are known in the art provides the amine 5-Scheme-3 This amine may be coupled with an acid in the presence of EDC and HOBT to provide the amide 5-Scheme-4 Oxidation of 5-Scheme-4 via methods that are known in the art, such as pyridine sulphur trioxide complex, provides the ketone 7-Scheme- 3_ Scheme 4 a) BnOC(0)Cl, pyridine or TEA, CH 2 C1 2 ; b) m-chloroperoxybenzoic acid, CH 2 C1 2 ; c) NaN , NH 4 C1, CH 3 OH:H 2 0 (8: 1 ); d) 1 ,3-propanedithiol, TEA, CH3OH; e) RC0 2 H, EDC, HOBt, CH 2 CI 2 ; f) HCl/EtOAc; g) RCHO, CH2CI2, sodium triacetoxyborohydride; h) HCI, EtOAc, methanol; i) RC0 2 H, EDC, HOBt, CH2CI2; j) DMSO, sulphur troxide pyridine complex, TEA Compounds of the formula (I) wherein n is 0 or 1 , R ' is an amide, R is hydrogen and R 2 is alkyl may be prepared as outlined in Scheme 4. Protection of the amines _L Scheme-4 with benzyl chloroformate in the presence of an organic base, such as pyridine or triethylamine, affords 2-Scheme-4. 2-Scheme-4 is epoxidized by standard conditions, such as meta-chloroperoxybenzoic acid, to provide the epoxide 3-Scheme-4 (n = 0, 1 ). The epoxide 3-Scheme-4 may be opened with sodium azide in a protic solvent, such as methanol and water, at an elevated temperature to give the azido alcohol 4-Scheme-4. The azide 4-Scheme-4 may be reduced to the amine 5-scheme-4 by methods that are common to the art, such as 1 ,3-propanedithiol with triethylamine, in a protic solvent, such as methanol. The amine 5-Scheme-4 is acylated under standard conditions with EDC, HOBt and a carboxyhc acid in an aprotic solvent, such as dichloromethane or DMF, to give 6-Scheme- 4. The amine 5-Scheme-4 may also be acylated with an acid chloride in the presence of an organic base, such as triethylamine or N-methyl morpholine, in an aprotic solvent, such as dichloromethane, to give the amide derivative 6-Scheme-4. Removal of the protecting group of 6-Scheme-4 is accomplished by methods known in the art, such as treatment with 10% palladium on carbon under hydrogen, to give 7-Scheme-4 compounds. The amine 7_; Scheme-4 may be alkylated by treatment with an aldehyde in an aprotic solvent, such as dichloromethane, followed by reduction with sodium cyanoborohydride or sodium triacetoxyborohydride. Alternatively, the amine 7-Scheme-4 may be acylated under standard conditions such as EDC, HOBt and a carboxyhc acid or with an acid chloride, as described previously, to give amide derivatives of 8-Scheme-4 (n = 0, 1 ). The tert- butoxycarbonyl protecting group of 8-Scheme-4 may be removed by methods that are known in the art, such as treament with hydrogen chloride or trifluoroacetic acid, in an aprotic solvent, such as dichloromethane or ethyl acetate. The amine salt may be coupled with an acid or acid chloride to give amides such as 10-Scheme-4. Alternatively, the amine salt 9-Scheme-4 may be converted to a carbamate by treatment with a chloroformate in the presence of base, such as triethylamine. 9-Scheme-4 may also be converted to sulphonamide by treatment with a sulphonyl chloride in the presence of base, such as triethylamine or N-methylmorpholine, in an aprotic solvent, such as dichloromethane. 9_ι Scheme-4 may also be converted to a urea by methods that are common to the art such as treatment with an isocyanate in the presence of base, such as triethyamine, in an aprotic solvent, such as dichloromethane. The alcohol 10-Scheme-4 may be oxidised by methods that are common in the art, such as pyridine sulphur trioxide complex with triethylamine in DMSO or methyl sulphoxide and oxalyl chloride at low temperature, in an aprotic solvent, such as dichloromethane, followed by tratment with an organic base, such as triethylamine, and warming. Scheme 5 a) methylamine; b) RC0 H, EDC, HOBT, CH 2 CI 2 ; c) HCI, EtOAc; d) RCHO, TEA, CH 2 CI 2 , sodium triacetoxyborohydride; e) pyridine sulphur trioxide complex, DMSO, TEA Compounds of the formula of (I) wherein n is 0, R ' is an amide, R is methyl and R 2 is alkyl were prepared as outlined in Scheme 5. The epoxide l-Scheme-5 may be opened with methylamine to provide 2-Scheme-5. Acylaton of 2-Scheme -5 by methods that are known in the art, such coupling with a carboxyhc acid with EDC and HOBt, provides the amide 3-Scheme-5. Removal of the protecting group may be accomplished by treating 3-Scheme-5 with a strong acid such as trifluoroacetic acid or hydrogen chloride, in an aprotic solvent, such as dicholormethane or ethyl acetate, provides the amine salt 4ι Scheme-5. This salt may be alkylated by treating it with an aldehyde followed by reduction with a reducing agent, such as sodium cyanoborohydride or sodium triacetoxyborohydride, to provide 5-Scheme-5. The alcohol 5-Scheme-5 may be oxidised by methods that are common to the art, such as pyridine sulphur trioxide complex. The starting materials used herein are commercially available amino acids or are prepared by routine methods well known to those of ordinary skill in the art and can be found in standard reference books, such as the COMPENDIUM OF ORGANIC SYNTHETIC METHODS, Vol. I-VI (published by Wiley-lnterscience). Coupling methods to form amide bonds herein are generally well known to the art. The methods of peptide synthesis generally set forth by Bodansky et al., THE PRACTICE OF PEPTIDE SYNTHESIS, Springer-Verlag, Berlin, 1984; E. Gross and J. Meienhofer, THE PEPTIDES, Vol. 1 , 1-284 (1979); and J.M. Stewart and J.D. Young, SOLID PHASE PEPTIDE SYNTHESIS, 2d Ed., Pierce Chemical Co., Rockford, III., 1984. are generally illustrative of the technique and are incorporated herein by reference. Synthetic methods to prepare the compounds of this invention frequently employ protective groups to mask a reactive functionality or minimize unwanted side reactions. Such protective groups are described generally in Green, T.W, PROTECTIVE GROUPS IN ORGANIC SYNTHESIS, John Wiley & Sons, New York (1981 ). The term "amino protecting groups" generally refers to the Boc, acetyl, benzoyl, Fmoc and Cbz groups and derivatives thereof as known to the art. Methods for protection and deprotection, and replacement of an amino protecting group with another moiety are well known. Acid addition salts of the compounds of formula (I) are prepared in a standard manner in a suitable solvent from the parent compound and an excess of an acid, such as hydrochloric, hydrobromic, hydrofluoric, sulfuric, phosphoric, acetic, trifluoroacetic, maleic, succinic or methanesulfonic. Certain of the compounds form inner salts or zwitterions which may be acceptable. Cationic salts are prepared by treating the parent compound with an excess of an alkaline reagent, such as a hydroxide, carbonate or alkoxide, containing the appropriate cation; or with an appropriate organic amine. Cations such as Li + , Na + , K + , Ca ++ , Mg ++ and NH 4 + are specific examples of cations present in pharmaceutically acceptable salts Halides, sulfate, phosphate, alkanoates (such as acetate and tπfluoroacetate), benzoates, and sulfonates (such as mesylate) are examples of anions present in pharmaceutically acceptable salts This invention also provides a pharmaceutical composition which comprises a compound according to formula (I) and a pharmaceutically acceptable carrier, diluent or excipient Accordingly, the compounds of formula (I) may be used in the manufacture of a medicament. Pharmaceutical compositions of the compounds of formula (I) prepared as hereinbefore described may be formulated as solutions or lyophihzed powders for parenteral administration Powders may be reconstituted by addition of a suitable diluent or other pharmaceutically acceptable carrier prior to use The liquid formulation may be a buffered, lsoto c, aqueous solution Examples of suitable diluents are normal isotonic saline solution, standard 5% dextrose in water or buffered sodium or ammonium acetate solution Such formulation is especially suitable for parenteral administration, but may also be used for oral administration or contained in a metered dose inhaler or nebulizer for insufflation It may be desirable to add excipients such as polyvinylpyrro done, gelatin, hydroxy cellulose, acacia, polyethylene glycol, mannitol, sodium chloride or sodium citrate Alternately, these compounds may be encapsulated, tableted or prepared in an emulsion or syrup for oral administration Pharmaceutically acceptable solid or liquid carriers may be added to enhance or stabilize the composition, or to facilitate preparation of the composition Solid carriers include starch, lactose, calcium sulfate dihydrate, terra alba, magnesium stearate or steaπc acid, talc, pectin, acacia, agar or gelatin Liquid carriers include syrup, peanut oil, olive oil, saline and water The carrier may also include a sustained release material such as glyceryl monostearate or glyceryl distearate, alone or with a wax. The amount of solid carrier varies but, preferably, will be between about 20 mg to about 1 g per dosage unit The pharmaceutical preparations are made following the conventional techniques of pharmacy involving milling, mixing, granulating, and compressing, when necessary, for tablet forms; or milling, mixing and filling for hard gelatin capsule forms. When a liquid carrier is used, the preparation will be in the form of a syrup, ehxtr, emulsion or an aqueous or non-aqueous suspension Such a liquid formulation may be administered directly p o or filled into a soft gelatin capsule For rectal administration, the compounds of this invention may also be combined with excipients such as cocoa butter, glycerin, gelatin or polyethylene glycols and molded into a suppository The compounds of formula (I) are useful as protease inhibitors, particularly as inhibitors of cysteine and serine proteases, more particularly as inhibitors of cysteine proteases, even more particularly as inhibitors of cysteine proteases of the papain superfamily, yet more particularly as inhibitors of cysteine proteases of the cathepsin family, most particularly as inhibitors of cathepsin K The present invention also provides useful compositions and formulations of said compounds, including pharmaceutical compositions and formulations of said compounds The present compounds are useful for treating diseases in which cysteine proteases are implicated, including infections by pneumocystis caπnii, trypsanoma cruzi, trypsanoma brucei, and Cπthidia fusiculata, as well as in schistosomiasis, malaria, tumor metastasis, metachromatic leukodystrophy, muscular dystrophy, amytrophy, and especially diseases in which cathepsin K is implicated, most particularly diseases of excessive bone or cartilage loss, including osteoporosis, gingival disease including gingivitis and periodontitis, arthritis, more specifically, osteoarthπtis and rheumatoid arthritis, Paget's disease, hypercalcemia of malignancy, and metabolic bone disease Metastatic neoplastic cells also typically express high levels of proteolytic enzymes that degrade the surrounding matrix, and certain tumors and metastatic neoplasias may be effectively treated with the compounds of this invention The present invention also provides methods of treatment of diseases caused by pathological levels of proteases, particularly cysteine and serine proteases, more particularly cysteine proteases, even more particularly as inhibitors of cysteine proteases of the papain superfamily, yet more particularly cysteine proteases of the cathepsin family, which methods comprise administering to an animal, particularly a mammal, most particularly a human in need thereof a compound of the present invention The present invention especially provides methods of treatment of diseases caused by pathological levels of cathepsin , which methods comprise administering to an animal, particularly a mammal, most particularly a human in need thereof an inhibitor of cathepsin K, including a compound of the present invention The present invention particularly provides methods for treating diseases in which cysteine proteases are implicated, including infections by pneumocystis caπnii, trypsanoma cruzi, trypsanoma brucei, and Cπthidia fusiculata, as well as in schistosomiasis, malaria, tumor metastasis, metachromatic leukodystrophy, muscular dystrophy, amytrophy, and especially diseases in which cathepsin K is implicated, most particularly diseases of excessive bone or cartilage loss, including osteoporosis, gingival disease including gingivitis and periodontitis, arthritis, more specifically, osteoarthπtis and rheumatoid arthritis, Paget's disease, hypercalcemia of malignancy, and metabolic bone disease This invention further provides a method for treating osteoporosis or inhibiting bone loss which comprises internal administration to a patient of an effective amount of a compound of formula (I), alone or in combination with other inhibitors of bone resorption, such as bisphosphonates (l e , allendronate), hormone replacement therapy, anti-estrogens, or calcitonin In addition, treatment with a compound of this invention and an anabolic agent, such as bone morphogenic protein, lproflavone, may be used to prevent bone loss or to increase bone mass For acute therapy, parenteral administration of a compound of formula (I) is preferred An intravenous infusion of the compound in 5% dextrose in water or normal saline, or a similar formulation with suitable excipients, is most effective, although an intramuscular bolus injection is also useful Typically, the parenteral dose will be about 0 01 to about 100 mg/kg, preferably between 0 1 and 20 mg/kg, in a manner to maintain the concentration of drug in the plasma at a concentration effective to inhibit cathepsin K The compounds are administered one to four times daily at a level to achieve a total daily dose of about 04 to about 400 mg/kg/day The precise amount of an inventive compound which is therapeutically effective, and the route by which such compound is best administered, is readily determined by one of ordinary skill in the art by comparing the blood level of the agent to the concentration required to have a therapeutic effect The compounds of this invention may also be administered orally to the patient, in a manner such that the concentration of drug is sufficient to inhibit bone resorption or to achieve any other therapeutic indication as disclosed herein Typically, a pharmaceutical composition containing the compound is administered at an oral dose of between about 0 I to about 50 mg/kg in a manner consistent with the condition of the patient Preferably the oral dose would be about 0 5 to about 20 mg/kg No unacceptable toxicological effects are expected when compounds of the present invention are administered in accordance with the present invention The compounds of this invention may be tested in one of several biological assays to determine the concentration of compound which is required to have a given pharmacological effect Determination of cathepsin K proteolytic catalytic activity All assays for cathepsin K were carried out with human recombinant enzyme Standard assay conditions for the determination of kinetic constants used a fluorogenic peptide substrate, typically Cbz-Phe-Arg-AMC, and were determined in 100 mM Na acetate at pH 5 5 containing 20 mM cysteine and 5 mM EDTA Stock substrate solutions were prepared at concentrations of 10 or 20 mM in DMSO with 20 uM final substrate concentration in the assays All assays contained 10% DMSO Independent experiments found that this level of DMSO had no effect on enzyme activity or kinetic constants All assays were conducted at ambient temperature Product fluorescence (excitation at 360 nM, emission at 460 nM) was monitored with a Perceptive Biosystems Cytofluor II fluorescent plate reader. Product progress curves were generated over 20 to 30 minutes following formation of AMC product. Inhibition studies Potential inhibitors were evaluated using the progress curve method. Assays were carried out in the presence of variable concentrations of test compound. Reactions were initiated by addition of enzyme to buffered solutions of inhibitor and substrate. Data analysis was conducted according to one of two procedures depending on the appearance of the progress curves in the presence of inhibitors. For those compounds whose progress curves were linear, apparent inhibition constants (Ki ι0 pp) were calculated according to equation 1 (Brandt et al., Biochemitsry, 1989, 28, 140): v = V m A / lK a (l + I/Ki, app ) +A] ( 1 ) where v is the velocity of the reaction with maximal velocity V m , A is the concentration of substrate with Michaelis constant of K a , and / is the concentration of inhibitor. For those compounds whose progress curves showed downward curvature characteristic of time-dependent inhibition, the data from individual sets was analyzed to give k 0 hs according to equation 2: [AMC] = v ss t + (vo - v ss ) [I - exp (-k 0 b s t)] / k 0 b s (2) where [AMC] is the concentration of product formed over time , vy is the initial reaction velocity and v ss is the final steady state rate. Values for k 0 bs ere then analyzed as a linear function of inhibitor concentration to generate an apparent second order rate constant (k 0 bs < inhibitor concentration or k 0DS / [I]) describing the time-dependent inhibition. A complete discussion of this kinetic treatment has been fully described (Morrison et al., Adv. Enzymol. Relat. Areas Mol. Biol, 1988, 61, 201). One skilled in the art would consider any compound with a K j of less than 50 micromolar to be a potential lead compound. Preferably, the compounds used in the method of the present invention have a Kj value of less than 1 micromolar. Most preferably, said compounds have a Kj value of less than 100 nanomolar. 4-( ?,5J-Amino-N- [(8-quinolinesulfonyl)-5-leucine]-3-tetrahydrofuran-3-one, a compound of formula (I), has a Kj value that is greater than 10 micromolar. Human Osteoclast Resorption Assay Aliquots of osteoclastoma-derived cell suspensions were removed from liquid nitrogen storage, warmed rapidly at 37°C and washed x l in RPMI- 1640 medium by centrifugation (1000 rpm, 5 min at 4°C). The medium was aspirated and replaced with murine anti-HLA-DR antibody, diluted 1 :3 in RPMI-1640 medium, and incubated for 30 min on ice The cell suspension was mixed frequently. The cells were washed x2 with cold RPMI-1640 by centrifugation (1000 rpm. 5 min at 4°C) and then transferred to a sterile 15 mL centrifuge tube. The number of mononuclear cells were enumerated in an improved Neubauer counting chamber. Sufficient magnetic beads (5 / mononuclear cell), coated with goat anti-mouse IgG, were removed from their stock bottle and placed into 5 mL of fresh medium (this washes away the toxic azide preservative). The medium was removed by immobilizing the beads on a magnet and is replaced with fresh medium. The beads were mixed with the cells and the suspension was incubated for 30 min on ice. The suspension was mixed frequently. The bead-coated cells were immobilized on a magnet and the remaining cells (osteoclast-rich fraction) were decanted into a sterile 50 mL centrifuge tube. Fresh medium was added to the bead-coated cells to dislodge any trapped osteoclasts. This wash process was repeated xlO. The bead-coated cells were discarded. The osteoclasts were enumerated in a counting chamber, using a large-bore disposable plastic pasteur pipette to charge the chamber with the sample. The cells were pelleted by centrifugation and the density of osteoclasts adjusted to 1.5x l0^/mL in EMEM medium, supplemented with 10% fetal calf serum and 1.7g/litre of sodium bicarbonate. 3 mL aliquots of the cell suspension ( per treatment) were decanted into 15 mL centrifuge tubes. These cells were pelleted by centrifugation. To each tube 3 mL of the appropriate treatment was added (diluted to 50 uM in the EMEM medium). Also included were appropriate vehicle controls, a positive control (87MEM 1 diluted to 100 ug/mL) and an isotype control (IgG2a diluted to 100 ug/mL). The tubes were incubate at 37°C for 30 min. 0.5 mL aliquots of the cells were seeded onto sterile dentine slices in a 48-well plate and incubated at 37°C for 2 h. Each treatment was screened in quadruplicate. The slices were washed in six changes of warm PBS (10 L / well in a 6-well plate) and then placed into fresh treatment or control and incubated at 37°C for 48 h. The slices were then washed in phosphate buffered saline and fixed in 2% glutaraldehyde (in 0.2M sodium cacodylate) for 5 min., following which they were washed in water and incubated in buffer for 5 min at 37°C. The slices were then washed in cold water and incubated in cold acetate buffer / fast red garnet for 5 min at 4°C. Excess buffer was aspirated, and the slices were air dried following a wash in water. The TRAP positive osteoclasts were enumerated by bright-field microscopy and were then removed from the surface of the dentine by sonication. Pit volumes were determined using the Nikon/Lasertec ILM21 W confocal microscope. Examples Nuclear magnetic resonance spectra were recorded at either 250 or 400 MHz using, respectively, a Bruker AM 250 or Bruker AC 400 spectrometer. CDCI3 is deuteriochloroform, DMSO-d 0 is hexadeuteπodimethylsulfoxide, and CD3OD is tetradeuteπomethanol. Chemical shifts are reported in parts per million (d) downfield from the internal standard tetramethylsiiane. Abbreviations for NMR data are as follows: s = singlet, d = doublet, t = triplet, q = quartet, m = multiplet, dd = doublet of doublets, dt = doublet of triplets, app = apparent, br = broad. J indicates the NMR coupling constant measured in Hertz. Continuous wave infrared (IR) spectra were recorded on a Perkin- Elmer 683 infrared spectrometer, and Fourier transform infrared (FTIR) spectra were recorded on a Nicolet Impact 400 D infrared spectrometer. IR and FTIR spectra were recorded in transmission mode, and band positions are reported in inverse wavenumbers (cm " 1 ). Mass spectra were taken on either VG 70 FE, PE Syx API III, or VG ZAB HF instruments, using fast atom bombardment (FAB) or electrospray (ES) lonization techniques. Elemental analyses were obtained using a Perkm-Elmer 240C elemental analyzer. Melting points were taken on a Thomas-Hoover melting point apparatus and are uncorrected. All temperatures are reported in degrees Celsius Analtech Silica Gel GF and E. Merck Silica Gel 60 F-254 thin layer plates were used for thin layer chromatography. Both flash and gravity chromatography were carried out on E. Merck Kieselgel 60 (230-400 mesh) silica gel Where indicated, certain of the materials were purchased from the Aldπch Chemical Co., Milwaukee, Wisconsin, Chemical Dynamics Corp., South Plainfield, New Jersey, and Advanced Chemtech, Louisville, Kentucky In the following synthetic examples, temperature is in degrees Centigrade (°C) Unless otherwise indicated, all of the starting materials were obtained from commercial sources. Without further elaboration, it is believed that one skilled in the art can, using the preceding description, utilize the present invention to its fullest extent. These Examples are given to illustrate the invention, not to limit its scope Reference is made to the claims for what is reserved to the inventors hereunder. Example 1 Preparation of 4-flN g -(benzyloxycarbonyπ-L-leucinyl]aminol-l -f(2S)-4-methyl-2- [Kbenzyloxycarbonyl)laminolpentanoyπ-3-pyrrolidinone a.) \ -tert -butoxycarbonyl-3-pyrrolidine To a solution of 3-pyrroline (5.0 g, 72.35 mmol) in CH2CI2 (25 mL) at room was added di-t-butyl dicarbonate (16.58 g, 75.97 mmol) in CH2CI2 (50 mL). The reaction was stirred for ca. 1 hour whereupon it was concentrated in vacuo to give the BOC protected 3- pyrroline which was used directly in the following step without further purification: Η NMR (200 MHz, CD3OD) 5.12 (m, 2H), 3.92 (m, 4H), 1.38 (s, 9H). b.) \ -tert -butoxycarbonyl-3,4-epoxypyrrolidine To a solution of compound of Example 1 (a) (5.0 g, 29.5 mmol) in CH2CI2 (200 mL) was added NaHC0 3 (9.03 g, 118.2 mmol) and m-CPBA (15.29 g, 88.6 mmol). The reaction was stirred at room temperature overnight whereupon it was concentrated and filtered with petroleum ether. The petroleum ether layer was washed with saturated K2CO3 (2x's), water, brine, dried (MgS0 4 ) and concentrated to give a clear colorless oil. Column chromatography of the oil (4: 1 hexanes:ethyl acetate) gave the title compound which was used directly in the following step: • H NMR (200 MHz, CDCI3) 3.85-3.20 (m. 6H), 1.43 (s,9H). c.) \ -tert -butoxycarbonyl-? O«5-3-azido-4-hydroxypyrrolidine To a solution of the compound of Example 1 (b) (2.03 g, 10.96 mmol) in methanol : water (18 mL of an 8: 1 solution) was added ammonium chloride (2.5 g, 10.96 mmol) and sodium azide (3.56 g, 54.8 mmol). The reaction was heated at 60°C overnight whereupon it was diluted with petroleum ether, washed with pH=4 buffer, sat. sodium bicarbonate, brine, dried (MgS0 4 ) and concentrated to give 2.12 g of the azido alcohol which was carried onto the next step without further purification: ^H NMR (400 MHz, CDCI3) 4.21 (br s, 1H), 3.92 (br s, 1H), 3.71-3.30 (m, 4H), 1.43 (s, 9H). d.) \-tert -butoxycarbonyl- ms-3-amino-4-hydroxypyrrolidine To a solution of the compound of Example 1 (c) (210 mg, 0.92 mmol) in CH3OH (10 mL) was added 10% Pd on carbon. This mixture was stirred under an atmosphere of hydrogen until TLC analysis indicated the complete disappearence of the starting material. The reaction was filtered through a pad of cehte with CH2CI2 and concentrated to give 202 mg of the title compound which was used directly in the following reaction. e.) (3RS,4RS)-4-[[N -(benzyloxycarbonyI)-L-leucιnyl]amιno]-l -?<?rt-butoxycarbonyl-3- pyrrolidinol To a solution of the compound of Example 1(d) (202 mg, 1.14 mmol) in CH2CI2 (5 mL) was added CBZ-leucine (302.9 mg, 1.14 mmol), HOBT (154 mg, 1 14 mmol) and EDC (262.2 mg, 1.37 mmol). The reaction was allowed to stir until complete by TLC analysis whereupon it was diluted with EtOAc and washed sequentially with pH 4 buffer, sat. K2CO , water and brine. The organic layer was dried (MgS0 4 ), filtered and concentrated Column chromatography of the residue (3: lEtOAc.hexanes) gave 325 mg of the title compound. MS(ES+) 450.3 (MH+), 472.2 (M+Na) f ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnol hydrochloπde To a solution of the compound of Example 1 (e) (310 mg, 0.69 mmol) in dry EtOAc (5 0 L) was bubbled HCI gas for approximately 5 minutes. The reaction was stirred until TLC analysis indicated the complete consumption of the starting material. The reaction was then concentrated in vacuo to give 249 mg of the title compound MS(ES+) 350.3 (MH+) g.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amιno]- 1 -[(2S)-4-methy 1-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pyrrolidinol To a solution of the compound of Example 1(0 (249 mg, 0.64 mmol) in CH2CI2 (10 mL) was added CBZ-leucine (170.4 mg, 0.64 mmol), HOBT (86.5 mg, 0.64 mmol), NMM (300 uL) and EDC (147.2 mg, 0.77 mmol). The reaction was allowed to stir at room temperature for 2 hours whereupon it was diluted with ethyl acetate and worked up as described previously. Column chromatography of the residue (3: 1 EtOAc :hexanes) gave 104 mg of the title compound: MS(ES+) 597.1 (MH+), 619.1 (M+Na). h.) 4-[[N"-(benzyloxycarbonyl)-L-leucinyl]amino]-1-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-pyrrolidinone To a 0°C solution of the compound of Example 1(g) (100 mg, 0.17 mmol) in acetone (5.0 mL) was added Jones reagent dropwise until the brown color persisted. The reaction was allowed to warm to room temperature and stirred approximately 48 hours whereupon it was quenched with iso-propanol, diluted with EtOAc and washed sequentially with sa'd K2C03, water and brine The organic layer was dried (MgS0 ), filtered and concentrated Column chromatography of the residue (3 1 EtOAc hexanes) gave 31 mg of the title compound MS(ES+) 595 1 (MH + ), 617 0 (M+Na) Example 2 Preparation of 4-flN a -(benzyloxycarbonyl)-L-leucιnyllamιno1- l -f4-(phenoxybenzamιde)]- 3-pyrrohdιnone Following the procedure of Example 1 (g)- 1(h) except substituting 4- phenoxybenzoic acid for CBZ-leucine in step 1 (g), the title compound was prepared MS(ES+) 544 3 (MH+), 566 2 (M+Na) Example 3 Preparation of 4-[IN s -(T>enzy]oxycarbonylVL-leucιnyl1amιnol- 1 -[4-(bιphenylethanoyl) - pyrrohdinone a ) (3RS,4RS)-4-[[N"-(benzyloxycarbonyl)-L-leucιnylJamιno|- l -[4-(bιphenylethanoyl))- pyrrohdmol Following the procedure of Example 1(g) except substituting 4-bιphenylacetιc acid for CBZ-leucine, the title compound was prepared MS(ES+) 544 3 (MH + ) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[4-(bιphenylethanoyl)]-3- pyrrohdinone To a -78°C solution of oxalyl chloride (0 026 mL, 0 29 mmol) in CH 2 CI 2 was added DMSO (0042 mL, 059 mmol) dropwise The reaction was maintained at -78°C for approximately 20 minutes whereupon a solution of the compound of Example 3(a) (65 mg, 0.12 mmol) in CH2CI2 was added dropwise The reaction was maintained at -78°C for 30 minutes whereupon triethylamine (0.16 mL, 1 19 mmol) was added The reaction was allowed to warm to room temperature, diluted with EtOAc and washed sequentially with pH 4 buffer, water and brine The organic layer was dried (MgS0 4 ) filtered and concentrated Column chromatography of the residue (3: 1 EtOAc:hexanes) gave 35 mg (54%)of the title compound: MS(ES+) 542.3, 564.3 (M+Na). Example 4 Preparation of 4-[[N a -(benzyloxycarbonyl)-L-leucinyllaminol-l -f(2S)-4-methyl-2- r[(benzyloxycarbonyl)1aminomethyl1pentanoyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-pyrrolidinol Following the procedure of Example 1(g) except substituting N-methyl-CBZ- leucine for CBZ-leucine, the title compound was prepared: MS(ES+) 61 1.3 (MH + ), 633.3 (MH + +Na). b.) 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l-[(2S)-4-meth l-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-pyrrolidinone Following the procedure of Example 3(b) except substituting the compound of Example 4(a), the title compound was produced: MS(ES+) 609.3 (MH + ). Example 5 Preparation of 4-riN ffl -(benzyloxycarbonyl)-L-leucinyllaminol- l-f(2S)-4-methyl-2-[Kfg -/- butoxyoxycarbonyl)laminomethyllpentanoyl1-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[[(tert- butoxyoxycarbonyI)]aminomethyl]pentanoyl]-3-pyrrolidinol Following the procedure of Example 1(g) except substituting N-methyl-N-BOC- leucine for CBZ-leucine, the title compound was produced: MS(ES+) 477.4 (MH + -C02-t- Bu), 577.4 (MH+), 599.4 (M+Na). b.) 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[[(tert- butoxyoxycarbonyl)]aminomethyl]pentanoyl]-3-pyrrolidinone Following the procedure of Example 3(b) except substituting the compound of Example 5(a), the title compound was produced: MS(ES+) 475.4 (MH+-C0 2 -t-Bu), 575.3 (MH+), 597.4 (M+Na). Example 6 Preparation of 4- [N a -(benzyloxycarbonyl)-L-leucinyllaminol- l -[(2S)-4-methyl-2- (aminomethyl)pentanoyll-3-pyrrolidinone hvdrochloride To a solution of the compound of Example 5(b) in dry ethyl acetate was bubbled HCI (g) for 2 minutes. The reaction was allowed to stir until complete as determined by TLC analysis. The reaction was concentrated and the residue was azeotropically dried with dry toluene (3x5 mL) to give the title compound: MS (ES+) 475.4 (MH + ). Example 7 Preparation of 4-lfN a -(benzyloxycarbonyl)-L-leucinyllaminol- l -rgrf-butoxycarbonyl-3- pyrrolidinone Following the procedure of Example 3(b) except substituting the compound of Example 1(e), the title compound was produced: MS (ES+) 448.3 (MH+), 470.3 (M+Na) Example 8 Preparation of 4-[rN a -(benzyloxycarbonyl)-L-leucinvnamino1-3-pyrrolidinone hvdrochloride Following the procedure of Example 6 except substituting the compound of Example 7, the title compound was produced: MS(ES) 348.4 (MH + ). Example 9 Preparation of 4-lf N g -(benzyloxycarbonyl)-L-leucinyllaminol- 1 -[(2S)-4-methyl-2-f[(N- tert-butoxycarbonyl)ethanoyllaminomethyllpentanoyll-3-pyrrolidinone To a solution of the compound of Example 6 (50 mg, 0 098 mmol) in CH2CI2 (5 0 mL) was added N-methyl morphohne (0 054 mL, 0 49 mmol), EDC (22 5 mg, 0 12 mmol), HOBT ( 13 3 mg, 0 098 mmol) and N-BOC-glycine ( 17 3 mg, 0 098 mmol) The reaction was allowed to stir at room temperature until complete by TLC analysis Workup and chromatography (3 1 ethyl acetate hexanes) gave 24 mg of the title compound MS (ES+) 632 4 (MH+), 654 3 (M+Na) Example 10 Preparation of 4-1 rN g -(benz loxycarbonyl)-L-leucιnyl laminol- 1 -f (2S)-4-methy 1-2- [(ethanoyl)amιnomethyllpentanoyll-3-pyrrohdιnone hvdrochloride Following the procedure of Example 6 except substituting the compound of Example 9, produced the title compound MS (ES) 532 4 (MH + ) Example 1 1 Preparation of 4-1 [N a -(benzyloxycarbonyl)-L-leucιnyl laminol- 1-1 (2S)-4-methyl-2-[[(fgrr- butoxycarbonyl)lamιnolpentanoyll-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2-[[(tert- butoxyoxycarbonyl)]amιno]pentanoyI]-3-pyrrohdιnol Following the procedure of Example 1(g) except substituting Boc-leucine for CBZ- leucine, the title compound was prepared This material was carried onto the oxidation b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2-[[(tert- butoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone Following the procedure of Example 3(b) except substituting the compound of Example 1 1(a), the title compound was prepared- MS (ES+) 561 3 (MH+), 583 3 (M+Na) Example 12 Preparation of 4-riN g -( " benzyloxycarbonyl)-L-leucιnyl1amιnol- l-[(2R)-4-methyl-2- [f(benzyloxycarbonyl )lamιnolpentanoyl1-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pyrrolιdιnol Following the procedure of Example 1(g) except substituting CBZ-D-leucine for CBZ-leucine, the title compound was prepared This compound was used directly in the following step b ) 4-[[N α -(benzyloxycarbony)-L-leucιnyI]amιno]- l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone Following the procedure of Example 3(b) except substituting the compound of Example 12(a), the title compound was prepared MS(ES+) 595 5 (MH + ), 633 6 (M+Na) Example 13 Preparation of 4-rfN a -(benzyloxycarbonyl)-L-leucιnynamιno]-1 -[2-[( benzv]oxycarbonyl)amιnolethanoyn-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιnoJ- 1 -[2-[( benzyloxycarbonyl)amιno]ethanoyl]-3-pyrrohdιnonol Following the procedure of Example 1(g) except substituting CBZ-glycine for CBZ-leucine, the title compound was prepared This material was used directly in the following step b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]ammo]-l-[2- [(benzyloxycarbonyl)amιno]ethanoyI]-3-pyrrohdιnonone Following the procedure of Example 3(b) except substituting the compound of Example 13(a), the title compound was prepared MS(ES+) 539 3 (MH + ), 561 3 (M+Na) Example 14 Preparation of 4-IIN g -(benzyloxycarbonyl ) -L-leucιny I laminol- 1-l(2S)-3-tert-butoxy- lf(benzyloxycarbonyl)lamιnolpropanovn-3-pvrrolιdιnone a.) (3RS,4RS)-4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]- I-[(2S)-3-tert-butoxy- [[(benzyloxycarbonyl)]amιno]propanoyl]-3-pyrrohdιnol Following the procedure of Example 1(g) except substituting CBZ-Ser(t-Bu)-OH for CBZ-leucine, the title compound was prepared This material was used directly in the following step b ) 4-[[N -(benzyloxycarbony l)-L-leucιnyl]amιno]- 1 -[(2S)-3-tert-butoxy- [[(benzyloxycarbonyl)]amιno]propanoyl]-3-pyrrohdιnone Following the procedure of Example 3(b) except substituting the compound of Example 14(a), the title compound was prepared- MS(ES+) 625 4 (MH + ), 647 3 (M+Na) Example 15 Preparation of 4-1 [N a -(benzyloxycarbonyl)-L-leucιnyl laminol- l-l(2S)-2- [Kbenzyloxycarbonyl)lamιno]propanovπ-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]ammo]-l -[(2S)-2- [[(benzyloxycarbonyl)]amιno]propanoyl]-3-pyrrohdιnol Following the procedure of Example 1(g) except substituting CBZ-alamne for CBZ-leucine, the title compound was prepared This material was used directly in the following step b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[(2S)-2- [[(benzyloxycarbonyl)]amtno]propanoyl]-3-pyrrohdιnone Following the procedure of Example 3(b) except substituting the compound of Example 15(a), the title compound was prepared: MS(ES+) 553.3 (MH + ), 575 3 (M+Na) Example 16 Preparation of 4-frN g -(benzyloxycarbonyiy-L-leucιnyl1amιnol-l-lcvclohexanepropano ll- 3-pyrrohdιnone a.) (3RS,4RS)-4-[[N"-(benzyloxycarbonyl)-L-Ieucinyl]aminoJ- 1 -[cyclohexanepropanoyl]-3- pyrrohdinol Following the procedure of Example 1(g) except substituting cyciohexanepropionic acid for CBZ-leucine, the title compound was prepared. This material was used directly in the following step. b.) 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l-|cyclohexanepropanoyl]-3- pyrrolidinone Following the procedure of Example 3(b) except substituting the compound of Example 16(a), the title compound was prepared: MS(ES+) 486.4 (MH+), 508.3 (M+Na). Example 17 Preparation of 4-[[N a -(benzyloxycarbonyl)-L-leucinyllaminol- l -f(2S)-4-methyl-2-lK4- pyridinylmethoxycarbonyl)1aminolpentanoyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l -[(2S)-4-methyI-2-[[(4- pyridinylmethoxycarbonyl)]amino]pentanoylJ-3-pyrrolidinol Following the procedure of Example 1(g) except substituting N-(4- pyridylmethoxycarbonyl)-L-leucine for CBZ-leucine, the title compound was produced: MS (ES+) 598.2 (MH + ) b.) 4-[[N α -(benzyloxycarbonyI)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[[(4- pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-pyrrolidinone To a solution of the alcohol of Example 17(a) (200 mg, 0.34 mmol) in DMSO (3 mL) was added TEA (0.30 mL) and sulphur trioxide pyridine complex (162 mg). The reaction was stirred at room temperature for 2 hours whereupon it was partitioned between ethyl acetate and water. The organic layer as washed with water (2x's), brine, dried (MgSO ), concentrated and the residue chromatographed (5% CH3θH:CH2Cl2) to give 67.3 mg of the title compound: MS (ES+) 596 (MH + ). Example 18 Preparation of 4-riN a -(benzyloxycarbonyl)-L-leucιnyl]amιnol- l-[(2S)-4-methyl-2-f[(2- pyπdιnylmethoxycarbonyl)lamιnolpentanoyl l-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2-[[(2- pyπdιnyloxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnoI Following the procedure of Example 1(g) except substituting N-(2- pyrιdylmethoxycarbonyl)-L-leucme for CBZ-leucme, the title compound was produced MS(ES+) 598 (MH+) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2-[[(2- pyπdιnylmethoxycarbonyl)]amιno]pentanoyl]-3-pyrrolιdιnone Following the procedure of Example 17(b) except substituting the compound of Example 18(a), the title compound was produced MS(ES+) 596 (MH + ) Example 19 Preparation of 4-rfN"-(benzyloxycarbonyl)-L-leucιnyl laminol- 1 -f (2S)-4-methyl-2-ll(3- pyπdιnylmethoxycarbonyl)lamιno1pentanoyn-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 -[(2S)-4-methyl-2-[[(3- pyπdιnylmethoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnol Following the procedure of Example 1(g) except substituting N-(3- pyπdylmethoxycarbonyl)-L-leucιne for CBZ-leucme, the title compound was prepared MS(ES+) 598 (MH + ) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2-[[(3- pyπdιnylmethoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone Following the procedure of Example 17(b) except substituting except substituting the compound of Example 1 (a), the title compound was produced- MS(ES+) 596 (MH + ) Example 20 Preparation of 4-ffN s -Cbenzyloxycarbonyl)-L-leucιnyl]amιno1-l-(2-pyrιdylcarbonyl)-3- pyrrohdinone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -(2-pyπdylcarbonyl)-3- pyrrohdinol Following the procedure of Example 1 (g) except substituting picohnic acid for CBZ-leuc e and triethylamine for N-methylmorphohne, the title compound was produced MS(ES+) 469 (MH+) b 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-(2-pyndylcarbonyl)-3-pyrrohdιnone Following the procedure of Example 17(b) except substituting the compound of Example 20(a), the title compound was produced MS(ES+) 467 (MH+) Example 21 Preparation of 4-f[N a -(benzyloxycarbonyl)-L-leucιnyl laminol- l -f(2S)-4-methyl-2- f f(benzyloxycarbonyl)lamιno1pentanovn-3-pιperιdιnone a ) 1 -ten -butoxycarbonyl- 1 ,2,3,6-tetrahydropyπdιne To a solution of 1 ,2,3,6-tetrahydropyrιdme (5 0 g, 60 0 mmol) in CH2CI2 (25 mL) at room was added di-t-butyl dicarbonate (13 75 g, 63 0 mmol) in CH2CI2 (50 mL) The reaction was stirred for ca 1 hour whereupon it was concentrated in vacuo to give 1 1 1 g of BOC protected amine 'H NMR (CDCI3) 5 8 (m, 1H), 5 6 (m, 1H), 6 88 (br s, 2H), 3 45 (m, 2H), 1 46 (s, 9H) b ) 1- rf -butoxycarbonyl-3,4-epoxy-pιpeπdιne To a solution of the compound of Example 21(a) (5 0 g, 27 3 mmol) in CH2CI2 (250 mL) was added m-CPBA (18 83 g, 109 5 mmol) portionwise The reaction was stirred at room temperature overnight whereupon it was concentrated and diluted and filtered with petroleum ether. The petroleum ether layer was washed with saturated K2CO3 (2x's), pH=4 buffer, water, brine, dried (MgS0 4 ) and concentrated to give a clear colorless oil Column chromatography of the oil (4: 1 hexanes ethyl acetate) gave 3 70 g of the epoxide which was used directly in the following step c ) l-rgrr -butoxycarbonyl-3-hydroxy-4-azido-piperidine To a solution of the compound of Example 21(b) (3 70 g, 18 57 mmol) in methanol water ( 18 mL of an 8 1 solution) was added ammonium chloride (2 08 g, 38 98 mmol) and sodium azide (6 03 g, 92 85 mmol) The reaction was heated at reflux overnight whereupon it was diluted with ethyl acetate, washed with IN HCI, water, brine , dried (MgS0 4 ) and concentrated to give 3 25 g of the azido alcohol which was used directly in the following step d ) 1 -ten -butoxycarbonyl-3-hydroxy-4-amιno-pιpeπdιne To a solution of the compound of Example 21(c) (3 25 g) in CH3OH (25 mL) was added 10% Pd on carbon (1 g) This mixture was stirred under an atmosphere of hydrogen until TLC analysis indicated the complete disappearence of the starting material The reaction was filtered through a pad of cehte with CH2CI2 and concentrated to give the amino alcohol e ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-fe?r-butoxycarbonyl-l- pipeπdinol To a solution of the compound of Example 21(d) (1 0 g, 4 62 mmol) was added CBZ-leucine (1 22 g, 4 62 mmol), EDC (1 07 g, 5.58 mmol) and HOBT (624 mg, 4 62 mmol) The reaction was allowed to stir until complete as indicated by TLC analysis Workup and column chromatography (1 1 hexanes:EtOAc) gave 883 mg of the title compound. MS(ES+) 464.4 (MH+), 486.2 (M+Na) f ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyI)-L-leucιnyl]amιno]-3-pιpeπdιnol hydrochlonde To a solution of the compound of Example 21(e) (883 mg, 1.96 mmol) in dry EtOAc (10 mL) was bubbled HCI gas for approximately 5 minutes. The reaction was stirred until TLC analysis indicated the complete consumption of the starting material The reaction was then concentrated in vacuo to give 742 mg of the title compound MS(ES+) 364 3 (MH+). g.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinol The compound of Example 21(f) (150 mg, 0.43 mmol) was coupled with CBZ- leucine (1 13.8 mg, 0.43 mmol), EDC (98.7 mg, 0.52 mmol), HOBT (57.9 mg, 0.43 mmol) and NMM (014 mL, 1.28 mmol). Workup and column chromatography (2: 1 EtOAc:hexanes) gave 225 mg of the title compound: MS(ES+) 61 1.2 (MH + ), 633.2 (M+Na). h.) 4-[[N α -(benzyloxycarbony)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinone Following the procedure of Example 3(b) except substituting the compound of Example 21(g), the title compound was produced: MS(ES+) 609.3 (MH+), 631.2 (M+Na). Example 22 Preparation of 4-f rN ffl -(benzyloxycarbonyl)-L-leucinyllaminol- l -l4-(biphenvDethanoyll-3- piperidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -[4-(biphenyl)ethanoyl]-3- piperidinol Following the procedure of Example 21(g) except substituting 4-biphenylacetic acid for CBZ-leucine, the title compound was prepared: MS(ES+) 558.2 (MH + ), 580.1 (M+Na). b. 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-[4-(biphenyl)ethanoyl]-3-piperidinone Following the procedure of Example 21(h) except substituting the compound of Example 22(a), the title compound was prepared: MS(ES+) 556.3 (MH + ), 578.2 (M+Na). Example 23 Preparation of 4-flN a -(benzyloxycarbonyl)-L-leucinyllaminol-l -f(2S)-4-methyl-2- π(benzyloxycarbonyl)laminomethyllpentanoyll-3-piperidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyI]aminol-l -[(2S)-4-methyl-2- [[(benzyloxycarbony l)]aminomethyl]pentanoyl ]-3-piperidinol Following the procedure of Example 21(g) except substituting N-methyl-CBZ- leucine for CBZ-leucine, the title compound was prepared: MS(ES+) 625.4 (MH + ), 647.3 (M+Na). b. 4-[[N -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-piperidinone Following the procedure of Example 21 (h) except substituting the compound of Example 23(a), the title compound was prepared: MS(ES+) 623.3 (MH + ), 643.4 (M+Na). Example 24 Preparation of 4-πN a -(benzyloxycarbonyl)-L-leucinyl laminol- l-rerf-butoxycarbonyl-3- piperidinone Following the procedure of Example 21(h) except substituting the compound of Example 21(e), the title compound was prepared: MS(ES+) 462.4 (MH+), 484.4 (M+Na) Example 25 Preparation of 4-ffN B -(benzyloxycarbonyl)-L-leucinyllaminol-l-l2- rf(benzyloxycarbonyl)hso-butylaminolethanoyll-3-piperidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-[2- [[(benzyloxycarbonyl)]iso-butylamino]ethanoyl]-3-piperidinol Following the procedure of Example 21(g) except substituting N-i-butyl-N-CBZ glycine for CBZ-leucine, the title compound was prepared: MS(ES+) 61 1.4 (MH + ), 633.5 (M+Na). b 4-[[N α -(benzyIoxycarbonyl)-L-leucιnyl]amιno]- l -[2-[[(benzyloxycarbonyl)]ιso- butylamιno]ethanoyl]-3-pιpeπdιnone Following the procedure of Example 21(h) except substituting the compound ol Example 25(a), the title compound was prepared: MS(ES+) 609 3 (MH + ), 631 4 (M+Na) Example 26 Preparation of 4-ffN a -(benzyloxycarbonyl)-L-leucιnyllamιnol- l -[2-l(/err- butoxycarbonyl)amιnolethanoyll-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιnol-l-[2-[(r<?/-/- butoxycarbonyl)amιno]ethanoyl]-3-pιpeπdιnol Following the procedure of Example 21(g) except substituting N-BOC-glycine for CBZ-leucine, the title compound was prepared MS(ES+) 543 4 (M+Na) b 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[2-[( rf- butoxycarbonyl)amιnolethanoyl]-3-pιpeπdmone Following the procedure of Example 21(h) except substituting the compound of Example 26(a), the title compound was prepared MS(ES+) 519 5 (MH+), 541 3 (M+Na) Example 27 Preparation of 4-flN g -(benzyloxycarbonyl)-L-leucinyl laminol- l -l2-(amino)ethanoyl1-3- pipeπdinone hydrochlonde Following the procedure of Example 21(f) except substituting the compound of Example 26(c), the title compound was prepared MS(ES+) 419 4 (MH+) Example 28 Preparation of 4-IfN a -(benzyloxycarbonyl)-L-leucιnyllamιnol- 1 -(4-methylpentanoyl)-3- pipendmone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]ammo]- l-(4-methylpentanoyl)-3- pipendinol To a solution of 4-methyl valeric acid (0 08 L, 0 64 mL) in benzene (3 L) was added oxalyl chloride (0056 mL, 0 64 mmol) followed by the addition of 2 drops of DMF The reaction was stirred for an additional 20 minutes whereupon it was concentrated in vacuo to give an oil This oil was dissolved in CH2CI2 ( I 0 ml) and added to a 0°C solution of the compound from Example 21 (0 (212 m g) ιn H2CI2 containing DIEA (0 27 mL) The reaction was warmed to room temperature and stirred for 90 minutes The reaction was diluted with CHCI3 and washed with IN HCI, H2O, brine and dried to give 142 mg of the title compound as an oil MS (ES+) 462 5 (MH+), 484 5 (M+Na) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -(4-methylpentanoyl)-3-pιpeπdιnone Following the procedure of Example 21 (h) except substituting the compound of Example 28(a), the title compound was prepared MS(ES+) 460 5 (MH + ), 482 5 (M+Na) Example 29 Preparation of 4-[lN B -(benzyloxycarbonyl)-L-leucιnyllamιnol- l-(benzoyl)-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 -(benzoy l)-3-pιpeπdιnol To a solution of the compound of Example 21 (0 ( 1 1 1 mg, 0 40 mmol) in CH2CI2 (5 0 mL) was added DIEA (0 21 mL) and benzoyl chloride (0 056 mL, 048 mmol) The reaction was stirred for 2 5 hours at room temperature, concentrated and the residue was chromatographed (5 95 CH3OH CHCI3) to give 155 mg of the title compound MS(ES+) 490 3 (M+Na) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -(benzoyl)-3-pιpeπdιnone Following the procedure of Example 21(h) except substituting the compound of Example 29(a), the title compound was prepared- MS (ES) 466 4 (MH+), 488 3 (M+Na) Example 30 Preparation of 4-1 rN g -(benzyloxycarbonyD-L-leucιnyl laminol- l-(acetyπ-3-pιperιdιnone ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyI)-L-leucιnyl]amιno]- l -(acetyl)-3-pιpeπdιnol Following the procedure of Example 29(a) except substituting acetyl chloride foi benzoyl chloride, the title compound was prepared MS(ES+) 428 5 (M+Na) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 -(acetyl)-3-pιperιdιnone Following the procedure of Example 21(h) except substituting the compound of Example 30(a), the title compound was prepared MS(ES+) 404 4 (MH + ) Example 31 Preparation of 4-[fN a -(benzyloxycarbonyl)-L-leucιnyllamιnol- l -(2-pyπdoxyacetyl)-3- pipendinone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-(2-pyπdoxyacetyl)-3- pipeπdinol Following the procedure of Example 21(g) except substituting 2-pyπdoxyacetιc acid for CBZ-leucine and DIEA for N-methylmorphohne, the title compound was prepared MS(ES+) 499 1 (MH+) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-(2-pyrιdoxyacetyl)-3-pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 31(a), the title compound was prepared MS(ES+) 497 3 (MH+) Example 32 Preparation of 4-ffN g -(benzyloxycarbonyl)-L-leucιnyllamιnol-l -I2-ff benzyloxycarbonyl)methylamιnolethanoyn-3-pιperιdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[2-[( benzyloxycarbonyl)methylamιno]ethanoyl]-3-pιpeπdιnol Following the procedure of Example 21(g) except substituting CBZ-sarcosine for CBZ-leucme and DIEA for N-methylmorphohne, the title compound was prepared MS(ES+) 591.3 (MH+) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[2-[( benzyloxycarbonyl)methylamιno]ethanoyl]-3-pιperιdιnone Following the procedure of Example 17(b) except substituting the compound of Example 32(a), the title compound was prepared: MS(ES+) 567 6 (MH + ), 589 4 (M+Na) Example 33 Preparation of 4-llN g -(benzyloxycarbony)-L-leucιnyl laminol- l-T3-(2- pyrιdyl)phenylacetyl)l-3-pιpeπdιnone a) 3-trifluoromethanesulphonyloxyphenylacetιc acid methyl ester To an oven-dried flask under Argon atmosphere containing sodium hydride (2 54 g, 60% dispersion in mineral oil, 63.5 mmol) was added anhydrous pentane (20 mL) The slurry was stirred for 5 mm, allowed to settle, most of the pentane was removed, and anhydrous THF (40 mL) was added. To this suspension was added a solution of 3- hydroxyphenylacetic acid methyl ester (9.99 g, 60.1 mmol) in anhydrous THF (20 mL) and the reaction was stirred at room temperature for 20 min. To this mixture was then added a solution of N-phenyltπfluoromethanesulfonimide (22.53 g, 63 1 mmol) in anhydrous THF (40 mL) and the reaction was stirred at room temperature until TLC analysis indicated the complete consumption of starting material (1.5 h). The reaction was quenched by the addition of H2O (10 mL), concentrated to one half original volume, then diluted with CHG3 (200 mL) and washed with H2O. The aqueous layer was washed with fresh CHCI3 (50 mL), the combined organic layers were washed with 10% Na2Cθ3, H2O, and brine, then dried (MgS0 4 ), filtered and concentrated. Column chromatography of the residue (silica gel, 5:95 EtOAc: hexanes, then 10:90 EtOAc: hexanes) gave 17 47 g of the title compound: l NMR (400 MHz, CDCI3) 7.42 (m, 1H), 7.31-7 19 (m, 3H), 3.72 (s, 3H), 3.68 (s, 2H) b) 3-(2-pyπdyl)phenyl acetic acid methyl ester To a solution of the compound of Example 33(a) (6 86 g, 23 0 mmol) in anhydrous dioxane (100 mL) was added 2-pyπdylstannane (8 89 g, 24 1 mmol), LiCI (2 94 g, 69 3 mmol), 2,6-dι-tert-butyl-4-methylphenol (a few crystals), and Pd(PPh3) 4 (632 1 mg, 0 55 mmol) The reaction was protected from light with foil and heated to reflux overnight The reaction was allowed to cool to room temperature and concentrated Column chromatography of the residue (silica gel, 1 3 EtOAc hexanes, then 1 2 EtOAc hexanes) gave 3.85 g of the title compound MS(ES+) 228 1 (MH+) c) 3-(2-pyπdyl)phenyl acetic acid To a solution of the compound of Example 33(b) (3 8 g, 16 7 mmol) in THF (50 mL) was added a solution of LιOH » H 2 0 (780 2 mg, 18 6 mmol) m H 2 0 (10 mL) The reaction was stirred at room temperature until TLC analysis indicated the complete consumption of starting material (2 h) The reaction mixture was concentrated to remove the THF, then neutralized to pH=7 by the addition of IN HCI, diluted with brine (50 mL), and washed with CHCI3 ( 100 mL) The aqueous layer was readjusted back to pH 7 by the addition on IN NaOH and washed with fresh CHCI3 (100 mL) After repeating this procedure once more, the organic layers were combined, dried, filtered (MgS0 4 ) and concentrated to give 3 79 g of the title compound MS (ES+) 214 3 (MH+) d) (3RS,4RS)-4-[[N -(benzyloxycarbony)-L-leucιnyl]amιno]-l -[3-(2- pyπdyl)phenylacetyl)]-3-pιpeπdιnol To a stirred suspension of the compound of Example 21(0 (1 21 g, 3 0 mmol) in DMF (10 mL) was added DIEA (523 uL, 3 0 mmol), HOBt (446 8 mg, 3 3 mmol), 3-(2- pyπdy phenyl acetic acid (709 7 mg, 3 3 mmol), and EDC (634 9 mg, 3 3 mmol) The reaction mixture was stirred at room temperature overnight whereupon it was added to a rapidly-stirred mixture of EtOAc, 10% Na2Cθ3, and brine ( 100 mL) each) and allowed to stir for 1 h The layers were separated, and the aqueous layer was washed with fresh EtOAc (100 mL), The combined organic layers were washed with 10% Na2C03 and brine, dried, filtered (MgS0 4 ), and concentrated Column chromatography (silica gel, EtOAc, then 5 95 MeOH EtOAc) gave 1 12 g of the title compound MS (ES+) 559 3 (MH+) e) 4-[[N α -(benzyloxycarbony)-L-leucιnyl]amιno]-l -[3-(2-pyπdyl)phenylacetyl)]- pipeπdinone Following the procedure of Example 17(b), except substituting the compound of Example 33(d), the title compound was prepared MS(ES+) 557 2 (MH+), 589 3 (M+ Na) Example 34 Preparation of 4-f fN a -(benzyloxycarbonyl)-L-leucιnyllamιno1-l -[2-[( benzyloxycarbonyπmethylamιnolethanoyll-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 -[2-[( benzyloxycarbonyl)methylamιno]ethanoyl]-3-pyrrohdιnol Following the procedure of Example 1 (g) except substituting CBZ-sarcosine for CBZ-leucme, the title compound was prepared MS(ES+) 554 2 (MH+), 577 2 (M+Na) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[2-[( benzyioxycarbonyl)methylamιno]ethanoyI]-3-pyrrohdιnone Following the procedure of Example 3(b) except substituting the compound of Example 34(a), the title compound was prepared MS(ES+) 553 2 (MH+), 575 2 (M+Na) Example 35 Preparation of 4-f[N a -(benzyloxycarbonyl)-L-leucιnyl laminol- l-12-(phenoxy)ethanoyl1-3- pyrro dinone a ) (3RS,4RS)-4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[2-(phenoxy)ethanoyl]-3- pyrrohdinol Following the procedure of Example 1(g) except substituting phenoxyacetic acid for CBZ-leucine, the title compound was prepared MS(ES+) 484 3 (MH+), 506 2 (M+Na) b ) 4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[2-(phenoxy)ethanoyl]-3- pyrrohdinone Following the procedure of Example 3(b) except substituting the compound of Example 35(a), the title compound was prepared: MS(ES+) 482.3 (MH + ), 504.3 (MH + +Na). Example 36 Preparation of 4-irN a -(4-pyridinylmethoxycarbonyl)-L-leucinyl laminol- 1-1(2- phenyl)ethanoyn-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l-[(2- phenyl)ethanoyl]-3-pyrrolidinol Following the procedure of Example 1(e)- 1(g) except substituting N-(4- pyridylmethoxycarbonyl)-L-leucine for CBZ-leucine in step 1 (e) and phenylacetic acid for CBZ-leucine in step 1 (g), the title compound was prepared: MS(ES+) 469 (MH + ). b.) 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl [amino]- 1 -f(2-phenyl)ethanoyl]-3- pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 36(a), the title compound was prepared: MS(ES+) 467 (MH + ). Example 37 Preparation of 4-[IN a -(4-pyridinylmethoxycarbonyl)-L-leucinyllaminol- l -ethanoyl-3- pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyI]amino]- l-ethanoyl-3- pyrrolidinol Following the procedure of Example 1 (e)- 1(g) except substituting N-(4- pyridylmethoxycarbonyl)-L-leucine for CBZ-leucine in step 1(e) and acetic acid for CBZ- leucine in step 1(g), the title compound was prepared: MS(ES+) 415 (M+Na). b.) 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-ethanoyl-3-pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 37(a), the title compound was prepared: MS(ES+) 391 (MH+). Example 38 Preparation of 4-rfN a -(4-pyridinylmethoxycarbonyl)-L-leucinyπaminol- 1 -(4- cyanobenzoylV3-pyrrolidinone a.) (3RS,4RS)-4-[[N -(4-pyridinylmethoxycarbony l)-L-leuciny l]amino]- 1 -(4- cyanobenzoyl)-3-pyrrolidinol Following the procedure of Example 1(e)- 1(g) except substituting N-(4- pyridylmethoxycarbonyl)-L-leucine for CBZ-leucine in step 1 (e) and 4-cyanobenzoic acid for CBZ-leucine in step 1(g), the title compound was prepared: MS(ES+) 480 (MH + ), 502 (M+Na). b.) 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l -(4-cyanobenzoyl)-3- pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 38(a), the title compound was prepared: MS(ES+) 478 (MH + ). Example 9 Preparation of 4-[fN g -(4-pyridinylmethoxycarbonyl)-L-leucinyllaminol-l-fgrf- butoxycarbonyl-3-pyrroIidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-rgA-?- butoxycarbonyl-3-pyrrolidinol Following the procedure of Example 1(e) except substituting N-(4- pyridylmethoxycarbonyl)-L-leucine for CBZ-leucine, the title compound was prepared: MS(ES+) 451 (MH+). b.) 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-rgr/-butoxycarbonyl-3- pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 39(a), the title compound was prepared MS(ES+) 449 (MH + ) Example 40 Preparation of 4-frN a -(3-pyrιdιnylmethoxycarbonyl)-L-leucιnyl1arnιnol-l-rg - butoxycarbonyl-3-pyrrohdιnone ) (3RS,4RS)-4-[[N α -3-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l -/g/?- butoxycarbonyl-3-pyrrohdιnol Following the procedure of Example 1(e) except substituting N-(3- pyπdylmethoxycarbonyl)-L-leucιne for CBZ-leucine, the title compound was piepared MS(ES+) 451 (MH+) b ) 4-[[N ra -(3-pyndinylmethoxycarbonyl)-L-leucinyl]amino]- l-fgrf-butoxycarbonyl- ' V pyrrohdinone Following the procedure of Example 17(b) except substituting the compound of Example 40(a), the title compound was prepared MS(ES+) 449 (MH + ) Example 41 Preparation of 4-frN a -(3-pyπdιnylmethoxycarbonyl)-L-leucιnyllamιnol-3-pyrrohdιnone bis hvdrochloride To a solution of the compound of Example 40(b) in ethyl acetate was added 4M HCl/dioxane (20 drops) The reaction was stirred at room temperature overnight whereupon it was concentrated to give the title compound MS(ES+) 349 (MH + ) Example 42 Preparation of 4-ffN s -(4-pyrιdιnylmethoxycarbonyl)-L-leucιnyllamιnol-3-pyrrohdιnone bis hvdrochloride Following the procedure of Example 41 except substituting the compound of Example 39(b), the title compound was prepared MS(ES+) 349 (MH + ) Example 43 Preparation of 4-πN g -(2-pyridinylmethoxycarbonyl)-L-leucinyl1aminol-1-[(2SV4-methyl- 2-[f(benzyloxycarbonyl)laminomethyllpentanoyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N'-(2-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- 1 -f(2S)-4-methy!-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-pyrrolidinone Following the procedure of Example 1(e)- 1 (g) except substituting N-(2- pyridylmethoxycarbonyl)-L-leucine for CBZ-leucine in step 1(e) and N-methyl-CBZ leucine for CBZ-leucine in step 1(g), the title compound was prepared: MS(ES) 612 (MH+). b.) 4-[[N α -(2-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-1-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 43(a), the title compound was prepared: MS(ES+) 610 (MH + ). Example 44 Preparation of 4-riN g -(4-pyridinylmethoxycarbonyl)-L-leucinyl1aminol- l-[(2SV4-methyl- 2-[f(4-pyridinylmethoxycarbonvπiaminolpentanoyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- 1 -[(2S)-4-methy I- 2-[[(4-pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-pyrrolidinol Following the procedure of Example l(e)-l(g) except substituting N-(4- pyridylmethoxycarbonyl)-L-leucine for CBZ-leucine in steps 1(e) and 1(g), the title compound was prepared: MS(ES+) 599 (MH+). b.) 4-[[N α -(4-pyridiny lmethoxycarbonyl)-L-leucinyl]amino]- 1 -[(2S)-4-methy l-2-[[(4- pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 44(a), the title compound was prepared: MS(ES+) 597 (MH + ). Example 45 Preparation of 4-r[N a -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyllamιno]- 1 -I(2S)-4-methyl- 2-lf(benzyloxycarbonyl)lamιnomethyllpentanoyll-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(4-pyrιdιnylmethoxycarbonyl)-L-leucιnyl [amino]- 1 -[(2S)-4-methyl- 2-[[(benzyloxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrolιdιnol Following the procedure of Example 1 (e)- 1 (g) except substituting N-(4- pyπdιnylmethoxycarbonyl)-L-leucιne for CBZ-leuc e in step 1(e) and N-methyl-CBZ- leucine for CBZ-leucine in step 1(g), the title compound was prepared MS(ES+) 612 (MH+) b ) 4-[[N α -(4-pyπdιnylmethoxycarbonyI)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- f[(benzyloxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnone Following the procedure of Example 17(b) except substituting the compound of Example 45(a), the title compound was prepared MS (ES+) 610 (MH + ) Example 46 Preparation of 4-rrN a -(3-ιsoquιnolιnecarbonyl)-L-leucιnyl)amιnol-1-f(2S)-4-methyl-2- rr(benzyloxycarbonyl)famιno)pentyll-3-pyrrolιdιnone a ) l-benzyloxycarbonyl-3-pyrrohdιne To a solution of 3-pyrrohne (25 g, 361 8 mmol) in CH 2 CI 2 (300 mL) at 0°C was added pyridine (33 L 416 mmol) followed by benzyl chloroformate (57 mL, 380 mmol) in CH2CI2 (100 mL) The reaction was stirred at 0°C for lh and at room temperature for 1 h The reaction was diluted CH2CI2, washed with IN HCI, water, brine, dried (MgS0 4 ) and concentrated The residue was chromatographed (50 50 CH2CI2 hexane) to give 70 g of the title compound MS(ES+) 226 (M+Na) b ) l-benzyloxycarbonyl-3,4-epoxy-pyrrohdιne To a solution of the compound of Example 46(a) (60 g, 295 mmol) in CH2CI2 ( 1000 mL) was added m-CPBA (153 g, 886 mmol). The reaction was stirred at room temperature overnight whereupon it was concentrated, filtered with petroleum ether and orangic layer was washed with saturated K2CO3 (3 times), water, brine, dried (MgS0 4 ) and concentrated to give a clear cololess oil which was used directly in the next step: MS(ES+) 242(M+Na). c.) 1 -benzyloxycarbonyl-fra/i5-3-azido-4-hydroxypyrrolidine To a solution of the compound of Example 46(b) (60 g, 273 mmol) in methanol: water (800 mL of an 8: 1 solution) was added ammonium chloride (29 g, 547 mmol) and sodium azide (35.6 g, 547 mmol). The reaction was heated at 50°C for 3h whereupon it was concentrated, diluted with ethyl acetate and washed sequentially with pH 4 buffer, saturated NaHCθ , water and brine. The organic layer was dried (MgS0 4 ), filtered and concentrated to give the title compound: Η NMR (400MHz, CDCI3) 7.35(m, 5H), 5.1(s, 2H), 4.2(m, 1H), 3.9(m, 1H), 3.3-3.7(m, 5H). d.) l-Benzyloxycarbonyl-/ra w-3-amino-4-hydroxypyrrolidine To a solution of the compound of Example 46(c) (53 g, 201 mmol) in CH3OH (1200 mL) was added triethylamine (56 L, 402 mmol) followed by 1 ,3-propanethiol (40.3 mL, 402 mmol). The reaction was stirred at room temperature overnight whereupon it was concentrated and purified by column chromatography (20:80 methanol: ethyl acetate) to give 38 g of the title compound: MS(ES) 237(MH + ). e.) (3RS,4RS)-4-[[N α -(tgrt-butoxycarbonyl)-L-leucinyl]amino]-l-benzyloxycarbonyl-3- pyrrolidinol To a solution of the compound of Example 46(d) (20 g, 84.6 mmol) in CH2CI2 (500 mL) was added Boc-L-leucine (22 g, 88.8 mmol), HOBT (12 g, 88.8 mmol) and EDC (20.28 g, 105.8 mmol). The reaction was allowed to stir at room temperature overnight whereupon it was diluted with CH2CI2 and washed 0.5N HO, sat'd NaHCθ3, water and brine. The organic was dried (MgS0 4 ), filtered and concentrated. Column chromatography of the residue (5:95 MeOH:CH2Cl2) gave 34 g of the title compound: MS(ES+) 450 (MH+). f.) (3RS,4RS)-4-[[N α -(ϊgrr-butoxycarbonyl)-L-leucinyl]amino]-3-pyrrolidinol To a solution of the compound of Example 46(e) (24 g, 53.4 mmol) in methanol :ethyl acetate (300 mL of a 1 :2 solution) was added 10% Pd on carbon. The mixture shaken on a Parr hydrogenator for 2h whereupon it was filtered through a pad of celite with CH2CI2 and concentrated to give 18 g of the title compound: MS(ES+) 316 (MH+). g.) CBZ-leucinal To a solution of CBZ-Leu-OH (2 g, 7.54 mmol) in CH 2 Cl2 (100 mL) was added EDC (1.73 g, 9.05 mmol), HOBT (1.22 g, 9.05 mmol) and N,0-dimethylhydroxylamine (0.93 g, 15.08 mmol). The reaction was allowed to stir at room temperature overnight whereupon it was diluted with CH2CI2 and washed with IN HCI, sat'd NaHC03, water and brine. The organic layer was dried (MgS0 4 ) filtered and concentrated. Column chromatography of the residue (40:60 ethyl acetate: hexane ) gave 2.3 g of the CBZ-leucine Weinreb amide: MS(ES+) 309 (MH+), 331(MH++Na). To a solution of the CBZ-leucine-N,0-dimethy I amide ( 1.2 g, 4 mmol) in THF ( 10 mL) at 0°C was added lithium aluminum hydride (10 mL of a 1.0 M solution in THF, 10 mmol) dropwise. The reaction was allowed to stir at 0°C for l h whereupon it was quenched with potassium hydrogensulfate (953 mg, 7 mmol). The mixture was diluted with ethyl acetate, washed with IN HCI, sat'd NaHC03, water and brine. The organic was dried (MgS0 4 ), filtered and concentrated to give 1.01 g of the title compound: ' H NMR (400 MHz, CDCI3) 9.5 (s, 1H) 7.35 (m, 5H), 5.1 (s, 2H), 4.3 (m, 1 H), 1.6-1.8 (m, 2H), 1.5 (m, 1H), 1.0 (m, 6H). h.) (3RS,4RS)-4-([N α -( gr -butoxycarbonyl)-L-leucinyl]amino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol To a solution of compound from Example 46(f ) (950 mg, 3.01 mmol) in CH2CI2 (10 mL) was added CBZ-leucinal (900 mg, 3.6 mmol). The reaction was allowed to stir at room temperature for 0.5h whereupon sodium triacetoxyborohydride (1.27 g, 6 mmol) was added. The reaction was stirred at room temperature for 2h whereupon it was diluted with ethyl acetate and washed with sat'd NaHCθ3, brine, dried (Na2S0 4 ), filtered and concentrated. Column chromatography of the the residue (5:95 methanol: CH2CI2) gave 1.3g of the title compound: MS(ES+) 549 (MH+), i.) (3RS,4RS)-4-[(L-leucinyl)amino]-l-[(2S)-4-methyl-2- [(benzyloxycarbonyl)amino]pentyl]-3-pyrrolidinoI hydrochloride To a solution of the compound of Example 46(h) (1.1 g, 2 mmol) in methanol (10 mL) was added 4M HCI in dioxane (10 mL). The reaction was stirred at room overnight whereupon it was concentrated to give the title compound: MS(ES) 449 (MH+). j.) (3RS,4RS)-4-[[N α -(3-isoquinolinecarbonyl)-L-leucιnyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol To a solution of above compound of Example 46(i) (250 mg, 0.48 mmol) in CH 2 C1 2 (10 mL) was added TEA (0.17 mL, 1.2 mmol) followed by 3- isoquinolinecarboxylic acid (96 mg, 0.5 mmol), EDC (1 15 mg, 0.6 mmol) and HOBT (68 g, 0.5 mmol). The reaction was stirred until complete by TLC analysis. Workup and column chromatography (5% CH3OH/CH2CI2) gave 180 mg of the title compound: MS(ES+) 604 (MH+). k.) 4-[[N α -(3-isoquinolinecarbonyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- f(benzyIoxycarbonyl)amino]pentyl]-3-pyrrolidinone To a solution of the compound of Example 46(j) ( 180 mg, 0.3 mmol) in DMSO (2.5 mL) was added TEA (0.25 mL, 1.8 mmol) and pyridine sulphur trioxide complex ( 143 mg, 0.9 mmol). The reaction was stirred at room temperature for 1 h whereupon it was partitioned between ethyl acetate and sat'd NaHCθ3. The organic layer was washed with brine, dried (Na2S0 ), filtered, concentrated and the residue chromatographed (5% CH3OH/CH2CI2) to give 1 10 mg of the title compound: MS(ES) 602 (MH+). Example 47 Preparation of 4-riN g -(4-pyridinylmethoxycarbonyl)-L-leucinynamino1- l-l 1- (adamantyl)carbonyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N'-(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- 1 -tert- butoxycarbonyl-3-pyrrolidinol To a solution of the compound of Example 1 (d) (1.0 g, 5.25 mmol) in CH2CI2 was added EDC (1.0 g, 5.25 mmol), HOBT (0.71 g, 5.25 mmol) and N-(4- pyπdylmethoxycarbonyl)-L-leucιne ( 1 4 g, 5 25 mmol) The reaction was stirred at room temperature overnight The following morning the rection was diluted with ethyl acetate and washed with water, brine, dried (Na2S0 4 ), filtered and concentrated Column chromatography of the residue (5% CH3OH CH2CI2) gave the title compound MS(ES+) 451 (MH+) b ) (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnol bis- hydrochloπde Following the procedure of Example 1 (0 except substituting the compound of Example 47(a), the title compound was prepared MS(ES+) 351 (MH + ) c ) (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l-[ l- (adamantyl)carbonylJ-3-pyrrohdιnol To a solution of the compound of Example 47(b) (300 mg, 0 71 mmol) in CH2CI2 was added TEA (0.34 mL), 2 48 mmol) followed by 1-adamantanecarbonyl chloride ( 149 mg, 0 75 mmol) The reaction was stirred until complete as indicated by TLC analysis Workup followed by column chromatography (5% CH3OH CH2CI2) gave the title compound MS(ES+) 513 (MH+) d ) 4-[[N α -(4-pyrιdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l-[ l-(adamantyl)carbonyl]-3- pyrrohdinone Following the procedure of Example 17(b) except substituting the compound of Example 47(c), the title compound was prepared MS(ES+) 51 1 (MH + ) Example 48 Preparation of 4-l[N a -(benzyloxycarbonyl)-L-leucιnyllamιnol-l -(4-methylpentanoyI)-3- pyrro dinone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-(4-methylpentanoyl)-3- pyrrohdinol Following the procedure of Example 1(g) except substituting 4-methyIvaleπc acid for CBZ-leucine, the title compound was prepared MS(ES+) 448 6 (MH + ), 4704 (M+Na) b ) 4-[[N u -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-(4-methylpentanoyl)-3-pyrrohdιnone Following the procedure of Example 3(b) except substituting the compound of Example 48(a), the title compound was prepared MS(ES+) 446 3 (MH + ), 468 4 (M+Na) Example 49 Preparation of 4-lfN a -(benzyloxycarbonyl)-D-leucιnyllamιnol- 1 -l(2S)-4-methyl-2- f[(benzyloxycarbonyl)lamιnolpentanoyl1-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-D-leucιnyl]amιno]-l-[(2S)-4-methyI-2- [[(benzyloxycarbony])]amιno]pentanoyl]-3-pιpeπdιnol To a solution of CBZ-leucine (7 97 g, 30 mmol) in CH2CI2 (100 mL) was added 1,2,3,6-tetrahydropyπdιne (2 5 g, 30 mmol), EDC (6 9 g) and HOBT (4 06 g) The reaction was stirred until complete as indicated by TLC analysis The reaction was diluted with ethyl acetate, washed with 2N HCI, sat'd K2CO , water, brine, dried (MgS0 4 ), filtered and concentrated to give 9 39 g of the amide To a solution of the amide (9 39 g) in CH2CI2 (250 mL) was added m-CPBA ( 19 61 g) The reaction was allowed to stir overnight whereupon it was concentrated, diluted with ether and washed sequentaillly with sat'd K2CO (5x's), water, brine, dried (MgS0 ) and concentrated to give 8 49 g of the epoxide as a clear oil To a solution of the epoxide (8 49 g) in CH3OH H2O (180 mL of an 8 1 solution) was added ammonium chloride (2 75 g) followed by sodium azide (7 96 g) This mixture was heated to 60°C for approximately 6 h Workup as in Example 1 (c) and column chromatography (2 1 hexane ethyl acetate) of the residue gave 5 2 g of the azide To a solution of SnCl2 dihydrate (432 mg) in methanol ( 10 mL) was added the azido alcohol (500 mg) The reaction was stirred overnight at room temperature whereupon it was concentrated, diluted with ethyl acetate and washed with 4N NaOH The aqueous layer was washed with ethyl acetate The combined organic layers were washed with water, brine, dried (MgS0 ), filtered and concentrated to give 235 mg of the am o alcohol To a solution of the above amino alcohol (150 mg, 041 mmol) was added CBZ-D- leucme (109 mg), EDC (95 mg) and HOBT (56 mg) The reaction was stirred until complete by TLC analysis. Workup gave 239.5 mg of the title compound: MS(ES+) 633.5 (M+Na). b.) 4-[[N α -(benzyloxycarbonyl)-D-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinone Following the procedure of Example 3(b) except substituting the compound of Example 49(a). the title compound was prepared: MS(ES+) 609.1 (MH+), 631.1 (M+Na). Example 50 Preparation of 4-r[N a -(rgrr-butoxycarbonyl)-L-leucinyllaminol- 1 -f (2S)-4-methyl-2- H(benzyloxycarbonyl)laminolpentanoyll-3-piperidinone a.) (3RS,4RS)-4-[[N α -(fgr/-butoxycarbonyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [|(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinol Following the procedure of Example 49(a) except substituting BOC-leucine for CBZ-D-leucine, the title compound was prepared. This material was used directly in the following step. b.) 4-[[N α -(/gr/-butoxycarbonyl)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinone Following the procedure of Example 3(b) except substituting the compound of Example 50(a), the title compound was prepared: MS(ES+) 475.5 (MH + -Cθ2-t-Bu), 575.4 (MH+), 597.5 (M+Na). Example 51 Preparation of 4-frN g -(benzyloxycarbonyl)-N E -(fgr/-butoxycarbonyl)-L-]ysinelaminol-l- r(2SV4-methyl-2-[(benzyloxycarbonyl)aminolpentanoyll-3-piperidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-N ε -(rgrr-butoxycarbonyl)-L-lysine]amino]- 1 - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinol Following the procedure of Example 49(a) except substituting CBZ-Lys(Boc)-OH for CBZ-D-leucine, the title compound was prepared: MS(ES+) 748.5 (M+Na). b.) 4-[[N α -(benzyloxycarbonyl)-N ε -(/gr/-butoxycarbonyl)-L-lysine]amino]- l-[(2S)-4- methyl-2-[[(benzyloxycarbonyl)]amino]pentanoyI]-3-piperidinone Following the procedure of Example 3(b) except substituting the compound of Example 51 (a), the title compound was prepared: MS(ES) 724.7 (MH + ), 746.5 (M+Na). Example 52 Preparation of 4-r[N a -(4-pyridinylmethoxycarbonyl)-L-leucinyllaminol- 1 -tert- butoxycarbonyl-3-piperidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l-/grf- butoxycarbonyl-3-piperidinol To a solution the compound of Example 21 (d) (1.77g, 8.18 mmol) in DMF (50 mL) was added DIEA (2.9 mL, 16.6 mmol), HOBT (1.35 g, 9.99 mmol), N-(4- pyridylmethoxycarbonyl)-L-leucine (2.62 g, 9.84 mmol) and EDC (1 .89 g, 9.87 mmol). The reaction was stirred for 16 hours whereupon it was concentrated and added to a rapidly stirred mixture of ethyl acetate (100 mL), 10% Na2Cθ3 (100 mL) and brine ( 100 L). This mixture was stirred for 1 hour and the organic layer was separated and washed with 50% brine, brine dried (Na2S0 4 ), filtered and concentrared. Column chromatography of the residue (5:95 CH 3 0H:CHC1 3 ) gave 2.43 g of the title compound: MS(ES+) 465.5 (MH+), 365.4 (MH+-Boc). b.) 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-fgrr-butoxycarbonyl-3- piperidinone Following the procedure of Example 3(b) except substituting the compound of Example 52(a), the title compound was prepared: MS(ES+) 463.5 (MH + ). Example 53 Preparation of 4-rfN g -(4-pyridinylmethoxycarbonyl)-L-leucinyHaminol- 1 -(4- methylpentanoyl)-3-piperidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3-piperidinol bis- hydrochloride The compound from Example 52(a) (2.16 g, 4.5 mmol) was dissolved in 4N HCl/dioxane and stirred at room temperature for 1 hour. The mixture was concentrated and azeotroped with toluene to give the title compound: MS(ES + ) 365.4 (MH+). b.) (3RS,4RS)-4-[[N a -(4-pyridinylmethoxycarbonyI)-L-leucinyl]amino|- 1 -(4- methylpentanoyl)-3-piperidinol To a solution of the compound from Example 53(a) (220 mg, 0.50 mmol) in DMF (2.0 mL) was added DIEA (0.35 mL, 2.0 mmol), HOBT (82.9 mg, 0.61 mmol), 4- methyl valeric acid (0.08 mL, 0.60 mmol) and EDC (1 16.6 mg, 0.61 mmol). The reaction was stirred for 18 hours whereupon it was added to a rapidly stirred mixture of ethyl acetate (50 mL), 5% Na2Cθ3 (50 mL) and brine (50 mL). This mixture was stirred for 1 hour and the aqueous layer was washed with ethyl acetate. The combined organic layers were washed with 10% Na2Cθ3, brine, dried (Na2S0 4 ), filtered and concentrated. Column chromatography of the residue (5:95 CH3θH:CHCl ) gave 138 mg of the title compound: MS(ES+) 463.5 (MH+). c.) 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l -(4-methylpentanoyl)-3- piperidinone Following the procedure of Example 17(b) except substituting the compound of Example 53(a), the title compound was prepared: MS (ES) 461.4 (MH+), 493.5 (M+Na). A second fraction of material with identical molecular weight was isolated from this reaction: MS(ES+) 461.4 (MH+). Example 54 Preparation of 4-rfN g -(4-pyridinylmethoxycarbonyl)-L-leucinyl laminol- 1 -12- (benzyloxycarbonylll/.yo-butylaminolethanoyll-3-piperidinone a ) (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyI)-L-leucιnyl]amιno]-l-[2- (ben/yloxycdrbonyl)]»o-butylamιno]ethanoyI]-3-pιpeπdιnol Following the procedure of Example 53(b) except substituting N-iso-butyl-CBZ- glycine for 4-methy I valeric acid, the title compound was prepared MS(ES+) 612 4 (MH + ) b ) 4-[[N -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- 1 -[2-(benzyloxycarbonyl)]«o- butylamιno]ethanoyl]-3-pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 54(a), the title compound was prepared MS(ES+) 610 5 (MH + ) Example 55 Preparation of 4-[[N-2-(benzyloxycarbonyl)h5O-butylamιnolethanoyll- 1 -K2S)-4-methyl-2- fKbenzyloxycarbonyl)lamιnolpentanoyll-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N-2-(benzyloxycarbonyl)]/ o-butylamιno]ethanoyl]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιpeπdιnol Following the procedure of Example 49(a) except substituting N-ι.rø-butyl-N-CBZ- glycine for CBZ-D-leucine, the title compound was prepared MS(ES+) 61 1 5 (MH + ), 633 5 (M+Na) b ) 4-[[N-2-(benzyloxycarbonyl)]wo-butylamιno]ethanoyl]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyI]-3-pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 55(a), the title compound was prepared. MS (ES+) 609 5 (MH+), 631 3 (M+Na) Example 56 Preparation of 4-rrN g -(benzyloxycarbonyl)-L-leucιnyπamιno1-1 -(methanesu1phonyl)-3- pipeπdinone a.) (3RS,4RS)-4-[[N"-(benzyloxycarbonyl)-L-leucinyl]amino]- l-(methanesulphonyl)-3- piperidinol The compound from Example 21 (e) (368 mg, 0.79 mmol) was dissolved in 4N HCl/dioxane (10 mL). The rection was stirred at room temperature for ca. 30 minutes whereupon it was concentrated and azeotropically dried with toluene (2 x's) and left under high vacuum for 1 hour. The white solid was dissolved in CH2CI2 (5.0 mL) and DIEA (0.41 mL, 2.4 mmol) was added. The reaction was cooled to 0°C. Methanesulphonyl chloride (0.073 mL, 0.94 mmol) was then added and the reaction was stirred at 0°C for 30 minutes and warmed to room temperature for 1.5 hours. The reaction was concentarted then dissolved in CHCI3 (50 mL), washed with IN HCI (2x25 mL), water, brine, dried (MgS0 4 ), filtered and concentrated to give 335 mg of a white solid: MS(ES+) 464.3 (M+Na). b.) 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino[- 1 -(methanesulphony l)-3-piperidinone Following the procedure of Example 3(b) except substituting the compound of Example 56(a), the title compound was prepared: MS(ES+) 440.3 (MH + ), 462.4 (M+Na). E ampl 57 Preparation of 4-r[N a -(benzyloxycarbon l)-L-leucinyl laminol- 1 -(phenylsulphon yl)-3- piperidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl jamino]- 1 -(phenylsuiphonyl)-3- piperidinol To a 0°C solution of the compound from Example 21(0 (161.2 m g. 0.40 mmol) in CH 2 Cl2 (5.0 mL) was added DIEA (0.21 mL, 1.21 mmol) followed by phenylsulphonyl chloride (0.06 mL, 0.48 mmol). The reaction was stirred at 0°C for 30 minutes then warmed to room temperature for 2.5 hours. The reaction was concentrated and chromatographed (2.5:97.5 CH3θH:CHCl3) to give 146 mg of the title compound: MS(ES+) 504.4 (MH+), 526.4 (M+Na). b.) 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -(phenylsulphony l)-3-piperidinone Following the procedure of Example 3(b) except substituting the compound of Example 57(a), the title compound was prepared: MS(ES+) 502.3 (MH+), 524.3 (M+Na). Example 58 Preparation of 4-[fN a -(4-pyridinylmethoxycarbonyl)-L-leucinyl laminol- 1 -(8- quinolinesulphonyl)-3-pyrrolidinone a.) (3RS,4RS)-4-[[N -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l-(8- quinolinesulphonyI)-3-pyrrolidinol To a solution of the compound of Example 47(b) (500 mg, 1.18 mmol) in CH2CI2 was added TEA (0.5 mL, 3.54 mmol) and 8-quinolinesulphonyl chloride (282 mg, 1.24 mmol). The reaction was stirred at room temperature until complete as indicated by TLC analysis. The reaction was diluted with ethyl acetate and washed with water, brine, dried (Na2S0 4 ), concentrated. Column chromatography (100% ethyl acetate) of the residue gave 560 mg of the title compound: MS(ES+) 542 (MH + ). b.) 4-[fN α -(4-pyridinylmethoxycarbonyl)-L-leucinyI]amino]- l -(8-quinolinesulphonyl)-3- pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 58(c), the title compound was prepared: MS(ES+) 540 (MH + ). Example 59 Preparation of 4-[rN a -(4-pyridinylmethoxycarbonyl)-L-leucinvnaminol- 1-(2- pyridylsulphonylV3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leuciny l]amino]- 1 -(2- pyridylsulphonyl)-3-pyrrolidinone Following the procedure of Example 58(a) except substituting 2-pyridylsulphonyl chloride for 8-quinolinesulphonyl chloride, the title compound was prepared: MS(ES+) 492 (MH+). b.) 4-[[N α -(4-pyridinylmethoxycarbony l)-L-leucinyl]amino]- 1 -(2-pyridy Isulphony l)-3- pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 59(a), the title compound was prepared: MS (ES+) 490 (MH + ). Example 60 Preparation of 4-[[N g -(4-pyridinylmethoxycarbony D-L-leucinyllaminol- 1 -1(2- propoxy)carbonyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-[(2- propoxy)carbonyl]-3-pyrrolidinol To a solution of the compound of Example 47(b) (383 mg, 0.91 mmol) in CH2CI2 was added TEA (0.44 mL, 3.2 mmol) followed by isopropyl chloroformate (0.96 mL of a 1.0 molar solution in THF, 0.96 mmol). The reaction was allowed to stir until complete as indicated by TLC analysis. Workup and chromatography gave 180 mg of the title compound: MS(ES+) 437 (MH+). b.) 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l -[(2-propoxy)carbonyl]-3- pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 60(a), the title compound was prepared: MS(ES+) 435 (MH + ). Example 61 Preparation of 4-1 [N a -(4-pyridinylmethoxycarbonyl)-L-leucin llaminol- 1 -f (3-methyl- 1 - propoxy)carbonyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- 1 -[(3-methy- 1 - propoxy)carbonyl]-3-pyrrolidinol Following the procedure of Example 60(a) except substituting isobutyl chloroformate for isopropyl chloroformate, the title compound was prepared: MS(ES+) 451 (MH+). b.) 4-[[N α -(4-pyridiny lmethoxycarbony l)-L-leucinyl]amino]- 1 -[(3-methy 1- 1 - propoxy)carbonyl]-3-pyrrolidinone Following the procedure of Example 17(b) except substituting the compound of Example 61(a), the title compound was prepared: MS(ES+) 449 (MH+). Example 62 Preparation of 4-[fN g -(benzyloxycarbonyl)-L-leucinyllaminol- 1-1(4- phenoxy)phenylsulphonyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(4- phenoxy)phenylsulphonyl]-3-pyrrolidinol To a solution of the compound of Example 1 (0 (200 mg, 0.51 mmol) in CH2CI2 (10 mL) was added N-methylmorpholine (0.22 mL, 2.04 mmol) and 4- phenoxyphenylsulphonyl chloride (201 mg, 0.76 mmol). The reaction was stirred at room temperature until complete as indicated by TLC analysis. The reaction was diluted with ethyl acetate and washed with water, brine, dried (Na2S0 4 ) and concentrated. Column chromatography of the residue ( 1 : 1 hexanes:ethyl acetate ) gave 186 mg of the title compound: MS(ES+) 582.1 (MH+), 604.1 (M+Na). b.) 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(4-phenoxy)phenylsulphonyl]-3- pyrrolidinone Following the procedure of Example 3(b) except substituting the compound of Example 62(a), the title compound was prepared: MS(ES+) 580.2 (MH+), 602.3 (M+Na). Example 63 Preparation of 4-ffN a -(benzyloxycarbonyl)-L-leucinyllaminol- 1-1(4- phenoxy)phenylsulphonyn-3-piperidinone a.) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l-[(4- phenoxy)phenylsulphonyl]-3-piperidinol To a solution of the compound of Example 21 (0 (150 mg, 0 38 mmol) in CH2CI2 (10 mL) was added N-methylmorphohne (0 21 mL, 1 94 mmol) and 4- phenoxyphenylsulphonyl chloride (135 mg, 0 50 mmol) The reaction was stirred at room temperature until complete as indicated by TLC analysis The reaction was diluted with ethyl acetate and washed with water, brine, dried (Na2S0 4 ) and concentrated Column chromatography of the residue ( 1 2 hexanes ethyl acetate ) gave 198 mg of the title compound MS(ES+) 596 1 (MH + ), 618 2 (M+Na) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[(4-phenoxy)phenylsulphonyl]-3- pipeπdinone Following the procedure of Example 3(b) except substituting the compound of Example 63(a), the title compound was prepared MS (ES+) 594 2 (MH+), 616 2 (M+Na) Example 64 Preparation of 4-[fN g -(3.4-dιchlorobenzoyl)-L-leucιnyl]amιnol-l-f(2S)-4-rnethyl-2- ff(benzyloxycarbonyl)larτnnolpentyn-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(3,4-dιchlorobenzoyl)-L-leucιnyl Jamino]- 1 -[(2S)-4-methyI-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 46(j) except substituting 3,4-dιchlorobenzoιc acid for 3-ιsoquιnohnecarboxyIιc acid, the title compound was produced MS(ES+) 622 (MH+) b.) 4-[[N α -(3,4-dιchlorobenzoyl)-L-leuctnyπamιno|- l-[(2S)-4-methyl-2- [[(benzyIoxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 64(a), the title compound was produced MS(ES+) 619 (MH + ) Example 65 Preparation of 4-[fN g -(6-quιnohnecarbonyl)-L-leucιnynamιnol- l-l(2S)-4-methyl-2- [[(benzyloxycarbonyl)lamιno1pentyll-3-pyrrohdιnone a.) (3RS,4RS)-4-[[N α -(6-quinolinecarbonyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol Following the procedure of Example 46 j) except substituting 6- quinolinecarboxylic acid for 3-isoquinolinecarboxylic acid, the title compound was produced: MS(ES+) 604 (MH+). b.) 4-[[N α -(6-quinohnecarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compund of Example 65(a), the title compound was produced: MS(ES+) 602 (MH + ). Example 66 Preparation of 4-lf2-dibenzofuransulphonyl)aminol-1-[(2S)-4-methyl-2- rr(benzyloxycarbonyl)1amino1pentanoyll-3-pyrrolidinone a.) (3RS,4RS)-4-[(2-dibenzofuransulphonyl)amino]- 1 -fgr/-butoxycarbonyI-3-pyrrolidinol To a solution of the compound of Example 1 (d) (200 mg) in DMF (5.0 mL) was added N-methylmorpholine (0.1 1 mL) and 2-dibenzofuransulphonyl chloride (264 mg). The mixture was stirred for 5 hours whereupon it was diluted with ethyl acetate and washed with water, brine, dried (Na2S0 4 ) and concentrared. Column chromatography of the residue (5% CH 3 OH:CHCl3) gave 490 mg of the title compound: MS(ES+) 433 (MH+). b.) (3RS,4RS)-4-[(2-dibenzofuransulphonyl)amino]-3-pyrrolidinol hydrochloride The compound of Example 66(a) (490 mg) was dissolved in ethtyl acetate (20 mL) and cooled to 0°C. HCI (g) was bubbled through the mixture for approximately 10 minutes. The reaction was stirred at 0°C for 1 hour and warmed to room temperature for 10 minutes. The solvent was evaporated to give the title compound which was used directly in the following step with no further purification: MS(ES+) 333 (MH + ). c.) (3RS,4RS)-4-[(2-dibenzofuransulphonyl)amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-pyrrolidinol To a solution of the compound of Example 66(b) (210 mg, 0.57 mmol) in CH2CI2 (50 mL) was added TEA (0.1 L, 0.68 mmol) EDC (131 mg, 0.68 mmol), HOBT (92 mg, 0.68 mmol) and CBZ-leucine ( 131 mg, 0.57 mmol). The reaction was stirred at room temperature for 4 hours whereupon it was diluted with ethyl acetate and washed with IN HCI, sat. NaHC03, water, brine, dried (Na2S0 ), filtered and concentrated. Column chromatography of the residue (5% CH3θH:CH2Cl2) gave 76 mg of the title compound: MS(ES+) 580 (MH+). d.) 4-[(2-dibenzofuransulphonyl)amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-pyrrolidinone Following the procedure of Example 1 (h) except substituting the compound from Example 66(c), the title compound was prepared: MS (ES+) 578 (MH + ). Example 67 Preparation of 4-ff 2-dibenzofuransulphonyl)aminol- 1 -l(2S)-4-methyl-2- IKbenzyloxycarbonyπimethylaminolpentanoyl l-3-pyrrolidinone a.) (3RS,4RS)-4-[(2-dibenzofuransulphonyl)amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]methylamino]pentanoyl]-3-pyrrolidinol Following the procedure of Example 66(c) except substituting N-methyl-CBZ- leucine for CBZ-leucine, the title compound was prepared: MS(ES+) 594 (M+Na). b.) 4-[(2-dibenzofuransulphonyl)amino]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]methylamino]pentanoyl]-3-pyrrolidinone Following the procedure of Example 1(h) except substituting the compound of Example 67(a), the title compound was prepared: MS(ES+) 329 (M-(N-CH3-CBZ- leucine)). Example 68 Preparation of 4-fTN a -fbenzyloxycarbonyl)-L-leucιnvHamιnol- 1 -(4-methylpentyl)-3- pipeπdinone a ) (3RS,4RS)-4-[[N oc -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -(4-methylpentyl)-3- pipeπdinol To a solution of the compound of Example 21 (0 in CH2CI2 ( 10 mL) was added TEA (043 mL) followed by 4-methylbutanal The reaction was stirred at room temperature for 2 hours whereupon it was concentrated in vacuo and allowed to dry under high vacuum for 1 hour The residue was the dissolved in CH2CI2 ( 10 mL) and sodium triacetoxyborohydride (1 22 g, 5 75 mmol) was added The reaction was stirred at room temperature for 17 hours whereupon it was diluted with CHCI3 and washed with water, brine, dried (Na2S0 4 ) and concentrated Column chromatography of the residue (5% CH3OH CHCI3) gave 0 69 g of the title compound. MS(ES+) 448 4 (MH+) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-(4-methylpentyl)-3-pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 68(a), the title compound was prepared MS(ES+) 446 4 (MH + ) Example 69 Preparation of 4-f 1 N B -(2-pyπdylcarbonyl)-L-leucιnvnamιnol- 1 -(4-methylpentyl)-3- pipeπdinone a ) (3RS,4RS)-4-[(L-leucιnyl)amιno]-l-(4-methylpentyl)-3-pιpeπdιnol To a solution of the compound of Example 68(a) in 5% formic acid methanol ( 10 mL) was added palladium black (638 mg) The reaction was allowd to stir at room temperature for 4 hours whereupon it was filtered through a pad of cehte to remove the catalyst The pad of ce te was rinsed sveral times with methanol The methanol was concentrated to give an oil which was dissolved in ethyl acetate and washed with 10% Na2Cθ3, brine, dried (Na2S0 4 ), filtered and concentrated to give 163 mg of an oil which was used directly in the following step with no further purification MS(ES+) 3144 (MH+) b.) (3RS,4RS)-4-[[N α -(2-pyridylcarbonyl)-L-leuciny l]amino]- 1 -(4-methylpent l)-3- piperidinol To a solution of the compound of Example 69(a) ( 159.3 mg, 0.51 mmol) in DMF (2.0 mL) was added picolinic acid (75.2 mg, 0.61 mmol), EDC (1 17 mg, 0.61 mmol and HOBT (82.6 mg, 0.61 mmol). The reaction was stirred for 48 hours at room temperature whereupon it was diluted with ethyl acetate and washed with 10% Na2C0 , brine, dried (MgS0 ), filtered and concentrated. Column chromatography of the residue (97:3 to 95:5 CHCl3:CH 3 OH) gave 149 mg of the title compound: MS(ES+) 419.3 (MH+). c.) 4-[[N α -(2-pyridylcarbonyl)-L-leucinyl]amino]- l-(4-methylpentyl)-3-piperidιnone Following the procedure of Example 17(b) except substituting the compound of Example 69(b), the title compound was prepared: MS(ES+) 417.3 (MH + ). Example 70 Preparation of 4-[f N g -(3-chlorobenzo l)-L-leucin yllaminol- 1 -(4-methylpenty 1V-3- piperidinone a.) (3RS,4RS)-4-[[N α -(3-chlorobenzoyl)-L-leucinyl[amino]- l -(4-methylpentyl)-3- piperidinol Following the procedure of Example 69(b) except substituting 3-chlorobenzoic acid for picolinic acid, the title compound was prepared: MS(ES+) 452.3 (MH + ). b.) 4-[[N α -(3-chlorobenzoyl)-L-leucinyl]amino]- l-(4-methylpentyl)-3-piperidinone Following the procedure of Example 17(b) except substituting the compound of Example 70(a), the title compound was prepared: MS (ES) 450.3 (MH + ). Example 71 Preparation of 4-rrN g -C2-quinolinecarbonvl)-L-leucinyllaminol- 1 -(4-methylpentyl -3- piperidinone a ) (3RS,4RS)-4-[[N α -(2-quιnohnecarbonyl)-L-leucιnyl]amιno|- l-(4-methylpentyl)-3- pipeπdinol Following the procedure of Example 69(b) except substituting 2- quinolinecarboxylic acid for picolinic acid, the title compound was prepared MS(ES+) 469 4 (MH+) b ) 4-[[N α -(2-quιnohnecarbonyI)-L-leucιnyl]amιnoj- 1 -(4-methylpentyl)-3-pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 71(a), the title compound was prepared MS (ES) 467 3 (MH + ) Example 72 Preparation of 4-irN α -(3.4-dιchlorobenzoyO-L-leucιnyl laminol- l -( -methy lpentyl)-3- pipeπdinone a ) (3RS,4RS)-4-[[N α -(3,4-dιchlorobenzoyl)-L-leucιnyl]amιno]- 1 -(4-methylpentyl)-3- pipeπdinol Following the procedure of Example 69(b) except substituting 2,3-dιchlorobenzoιc acid for picolinic acid, the title compound was prepared MS(ES+) 486 3 (MH+) b ) 4-[[N -(3,4-dιchlorobenzoyl)-L-leucιnyI]amιno]- l-(4-methylpentyl)-3-pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 72(a), the title compound was prepared MS(ES+) 484 1 (MH + ) Example 73 Preparation of 4-[[N g -(8-quιnolιnecarbonyl)-L-leucιnyllamιnol- l-(4-methylpentyl)-3- pipeπdinone a ) (3RS,4RS)-4-[[N α -(8-quιnohnecarbonyl)-L-leucιnyl]amιno]-l-(4-methylpentyI)-3- pipeπdinol Following the procedure of Example 69(b) except substituting 8- quinohnecarboxylic acid for picolinic acid, the title compound was prepared MS(ES+) 469 4 (MH+) b ) 4-[[N α -(8-quιnolιnecarbonyl)-L-leucιnyl]amιno]- 1 -(4-methylpentyl)-3-pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 73(a), the title compound was prepared MS(ES+) 467 3 (MH + ), 499 4 (M+Na) Example 74 Preparation of 4-lfN g -(3-ιsoquιnolιnecarbonyl)-L-leucιnyllamιnol- 1 -(4-methylpentyl)-V pipeπdmone a ) (3RS,4RS)-4-[[N -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno]- l -(4-methylpentyl)-3- pipeπdinol Following the procedure of Example 69(b) except substituting 3- lsoquinohnecarboxylic acid for picolinic acid, the title compound was prepared MS(ES+) 469 4 (MH+) b ) 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno]- l -(4-methylpentyl)-3-pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 74(a), the title compound was prepared MS(ES+) 467 3 (MH + ) Example 75 Preparation of 4-f !N g -(2-pyπdιnylmethoxycarbonyl)-L-leucιny llaminol- 1 -(4- methylpentyl)-3-piperidinone a ) 4-(benzyloxycarbonyl)amιno-l-fgr/ -butoxycarbonyl-3-pιpeπdιnol To a solution of the compound of ammo alcohol of Example 21(d) (5 43 g, 25 1 mmol) in CH2CI2 (75 mL) was added DIEA (6 5 mL, 37 3 mmol) followed by benzyl chloroformate (4 0 mL, 28.0 mmol) The reaction was stirred overnight whereupon it was concentrated and the residue was dissolved in CHCI3 an d washed with 5% NaHCθ3, water, IN HCI, brine, dried (Na2S0 4 ), filtered and concentrated. Column chromatography of the residue (40:60 ethyl acetate:hexanes) gave 2.30 g of the title compound: MS(ES+) 351.3 (MH+), 373.3 (M+Na). b.) 4-(benzyloxycarbonyI)amino-3-piperidinol hydrochloride The compound of Example 75(a) (2.2 g, 6.3 mmol) was dissolved in 4N HCl/dioxane and stirred for 45 minutes. The reaction was then concentrated and azeotroped with toluene (3 x's) to afford 1.78 g of the title compound as a glassy yellow solid: MS (ES) 251.2 (MH+). c.) (3RS,4RS)-4-[(benzyloxycarbonyl)amino]-l-(4-methylpentyl)-3-piperidinol To a solution of the compound of Example 75(b) (288.3 mg, 1.01 mmol) in CH2CI2 (2.0 mL) was added TEA (0.17 mL, 1.22 mmol) and 4-methylbutanal (241.5 mg, 1.21 mmol, this material was approximately 50% pure). The reaction was stirred for 1.5 hours whereupon it was concentrated and placed under high vacuum for 1 hour. The residue was the dissolved in CH2CI2 (3.0 mL) and sodium triacetoxyborohydride (467.4 mg, 2.21 mmol) was added. The reaction was stirred overnight at room temperature whereupon it was diluted with CHCI3 and washed with 50% brine, brine, dried (Na2S0 ) filtered and concentrated. Column chromatography of the residue (2.5:97.5 CH30H:CHCl3) gave 128.7 mg of the title compound: MS(ES+) 335.3 (MH+). d.) (3RS,4RS)-4-amino- 1 -(4-methylpentyl)-3-piperidinol To a 0°C solution of the compound of Example 75(c) (1.0 g, 2.99 mmol) in methanol (50 mL) was added palladium black (1.20 g). The mixture was stirred under a balloon of hydrogen for 2.5 hours whereupon it was filtered thru a pad of celite with methanol. The filtrate was concentrated to give 0.59 g of the title compound as a yellow oil: MS(ES+) 201.2 (MH+). e.) (3RS,4RS)-4-[[N α -(2-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- 1 -(4- methylpentyl)-3-piperidinol To a solution of the compound derived from Example 75(d) (178 mg, 0.90 mmol) in DMF (3.0 mL) was added EDC (207.2 mg, 1.08 mmol), HOBT (147.5 mg, 1.09 mmol) and N-(2-pyridylmethoxycarbonyl)-L-leucine (290.0 mg, 1.09 mmol). The reaction was stirred overnight whereupon it was poured rapidly into a stirred mixture of ethyl acetate (50 mL), 10% Na2Cθ3 and brine. This mixture was stirred for 1 hour and the organic layer as separated. The aqueous layer was washed with ethyl acetate (50 mL). The combined organic layers were washed with brine, dried (Na2S0 4 ) filtered and concentrated. Column chromatography of the residue (5:95 CH θH:CHCl3) gave 199.7 mg of the title compound: MS(ES+) 449.3 (MH+). f.) 4-[[N"-(2-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l -(4-methylpentyl)-3- piperidinone Following the procedure of Example 17(b) except substituting the compound of Example 75(e), the title compound was prepared: MS (ES) 447.4 (MH + ). Example 76 Preparation of 4-ffN g -(acetyl)-L-leucinyllaminol- 1 -(4-methylpentyl)-3-piperidinone a.) (3RS,4RS)-4-f[N'-(rgΛf-butoxycarbonyl)-L-leucinyl]amino]-l-(4-methylpentyl)-3- piperidinol To a solution of the compound of Example 75(d) ( 14 mg, 1.57 mmol) in DMF (7.0 mL) was added HOBT (256.7 mg, 1.90 mmol), BOC-leucine (473.2 mg, 1.90 mmol) and EDC (364.8 mg, 1.90 mmol). The reaction was stirred overnight at room temperature whereupon it was poured into a rapidly stirred mixture of ethyl acetate (50 mL), 10% Na2Cθ3 (50 mL) and brine (50 mL). This mixture was stirred for 30 minutes whereupon the aqueous layer was separated and washed with ethyl acetate (50 mL). The combined organic layers were washed with brine, dried (Na2S0 4 ), filtered, and concentrated. Column chromatography of the residue (3:97 CH3θH:CHCl ) gave 434 mg of the title compound: MS(ES+) 414.5 (MH+). b.) (3RS,4RS)-4-[(L-leucinyl)amino]- 1 -(4-methylpentyl)-3-piperidinol hydrochloride The compound from Example 76(a) (434 mg, 1.05 mmol) was dissolved in 4N HCl/dioxane (10 mL) and stirred at room temperature for approximately 30 minutes. The reaction was concentrated and azeotropically dried with toluene.. The amine salt (127.6 mg, 0.70 mmol) was then dissolved in CH2CI2 (4.0 mL) and DIEA was added (0.27 mL, 1 54 mmol) This solution was then divided in half and used directly in the following procedure MS (ES+) 314 4 (MH+) c ) (3RS,4RS)-4-[[N α -(acetyl)-L-leucιnyl Jamino]- 1 -(4-methy lpentyl)-3-pιpeπdιnol To a 0°C solution of the compound of Example 76(b) (0 35 mmol) was added acetic anhydride (0 04 mL) The reaction was stirred for 1 5 hours at 0°C whereupon it was diluted with CHCI3 (50 mL) and washed with 5% NaHC0 , brine, dried (MgS0 ), filtered and concentrated Column chromatography of the residue (5 95 CH3OH CHCI3) gave 1 3 mg of the title compound MS(ES+) 356 5 (MH+) d ) 4-[[N α -(acetyl)-L-leucιnyl]amιno]-l-(4-methylpentyl)- -pιpeπdιnone Following the procedure of Example 17(b) except substituting the compound of Example 76(c), the title compound was prepared- MS(ES+) 354 4 (MH + ) Example 77 Preparation of 4-HN a -(p-trιfluoromethylbenzenesulphonyl) L-leucιnyllamιnol- l -( " 4- methylpentyl)-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(p-tπfluoromethylbenzenesulphonyl)-L-leucιnyl]amιno]- l -(4- methylpentyl)-3-pιpeπdιnol To a 0°C solution of the compound of Example 76(b) (0 35 mmol) in CH2CI2 was added p-tπfluoromethyl benzenesulphonyl chloride ( 105 8 mg, 0 43 mmol) The reaction was stirred for ca 1 5 hours whereupon it was diluted with CHCI3 (50 ml) and washed with 5% NaHCθ3, brine, dried (MgS0 ), filtered and concentrated Column chromatography of the residue (5 95 CH3OH CHCI3) gave 94 2 mg of the title compound MS(ES+) 522 3 (MH+) b ) 4-[[N α -(p-tπfluoromethylbenzenesulphonyl)-L-leucιnyl]amιno]-l-(4-methylpentyl)-^- pipeπdinone Following the procedure of Example 17(b) except substituting the compound of Example 77(a), the title compound was prepared MS(ES+) 520 2 (MH+) Example 78 Preparation of 4-frN a -(6-quinolinecarbonyl)-L-leucinyllaminol- 1 -(4-methylpentyl)-3- piperidinone a.) (3RS,4RS)-4-[[N α -(6-quinohnecarbonyl)-L-leucinyl]amino]- l-(4-methylpentyI)-3- piperidinol To a solution of the compound of example 76(b) (0.35 mmol) in DMF (2.0 mL) was added DIEA (0.13 mL), HOBT (58.2 mg), 6-quinolinecarboxylic acid (73.2 mg) and EDC (85.2 mg). The reaction was stirred at room temperature for 48 hours whereupon it was poured into a rapidly stirred mixture of ethyl acetate (50 mL), 10% Na2Cθ3 (50 mL) and brine (50 mL). This mixture was stirred for 30 minutes whereupon the aqueous layer was separated and washed with ethyl acetate (50 mL). The combined organic layers were washed with 10% Na2C > , brine, dried (MgS0 4 ), filtered, and concentrated. Column chromatography of the residue (5:95 CH3θH:CHCl ) gave 91.8 mg of the title compound: MS(ES+) 469.4 (MH+). b.) 4-[[N α -(6-quinolinecarbonyl)-L-leucinyl]amino]- l -(4-methylpentyl)-3-piperidinone Following the procedure of Example 17(b) except substituting the compound of Example 78(a), the title compound was prepared: MS(ES+) 467.4 (MH + ). Example 79 Preparation of 4-[[2-(RS)-(3-biphenyl)-4-methyllaminolpentanoyll-l -(4-methylpentyl)-3- piperidinone a.) (3RS,4RS)-4-[[2-(RS)-(3-biphenyl)-4-methyllamino]pentanoyl]- 1 -(4-methy lpentyl)-3- piperidinol To a solution of the compound of example 75(d) ( 101.0 mg, 0.50 mmol) in DMF (2.0 mL) was added HOBT (82.5 mg, 0.61 mmol), 2-(3-biphenyI)-4-methyl valeric acid (161.8 mg, 0.60 mmol) and EDC (1 16.6 mg, 0.61 mmol). The reaction was stirred at room temperature for 17 hours whereupon it was poured into a rapidly stirred mixture of ethyl acetate (50 mL), 5% NaHC03 (50 mL) and brine (50 mL). This mixture was stirred for 30 minutes whereupon the aqueous layer was separated and washed with ethyl acetate (50 mL). The combined organic layers were washed with brine, dried (MgS0 4 ), filtered, and concentrated Column chromatography of the residue (2 98 CH3OH CHCI3) gave 72 9 mg of the title compound MS(ES+) 451 3 (MH+) b ) 4-[[2-(RS)-[( -bιphenyl)-4-methyl]amιno]pentdnoyl]- l -(4-methylpentyl)-^- pipeπdinone Following the procedure of Example 17(b) except substituting the compound of Example 79(a), the title compound was prepared MS(ES+) 449 4 (MH + ) Example 80 Preparation of 4-ffN g -(benzyloxycarbony)-L-leucιnyllamιnol-1 -12- [(benzyloxycarbonyl)methylamιno1ethyll-3-pιperιdιnone a ) (3RS,4RS)-4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[2- [(benzyloxycarbonyl)methylamιno]ethyl]-3-pιpeπdιnol To a stirred suspension of the amine hydrochlonde salt of Example 21 (0 (204 g, 5 09 mmol) in CH2G2OO mL) at room temperature was added triethylamine (836 uL, 6 0 mmol) A solution of N-[(benzyloxy)carbonyl]-N-methylamιnoacetaldehyde (1 25 g, 6 0 mmol) in CH2CI2 was added to the reaction mixture, which was stirred for 2h, then concentrated and stored under high vacuum for 2 h The residue was dissolved in CH2CI2 (15 mL), sodium triacetoxyborohydride (2 33 g, 1 1 0 mmol) was added, and the mixture was stirred overnight whereupon it was diluted with CHCI3 and washed with H2O and brine Column chromatography (silica gel, 3 97 MeOH CHCI3, then 5 95 MeOH CHCI3) gave the title compound which was used directly in the next step MS(ES + ) 555 2 (MH+) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[2- [(benzyloxycarbonyl)methylamιno]ethyl]-3-pιpeπdιnone To a solution of the alcohol of Example 80(a) (305 9 mg, 0 55 mmol) in anhydrous DMSO (2 mL) under argon was added triethylamine (460 uL, 3.3 mmol) and Sθ3 « pyπdιne complex (266 1 mg, 1 7 mmol) The reaction was stirred at room temperature until TLC analysis indicated the complete consumption of starting material (1h) whereupon the mixture was diluted with CHCI3 (100 mL) and washed with 1 1 brine 5% NaHCθ3 The aqueous layer was washed with fresh CHCI3 and the combined organic layers were washed with 5% NaHCθ3 and brine, then dried (MgS04), filtered, and concentrated. Column chromatography of the residue (silica gel, CHG3 then 2:98 MeOILCHC^) gave 131.4 mg of the title compound: MS(ES+) 553.2 (MH+). Example 81 Preparation of 4-f!N g -(α-toluenesulphonyl)-L-leucinvHaminol- l-l3-( ' 2- pyridyπphenylacetyl)l-3-piperidinone a.) (3RS,4RS)-4-[(L-leucinyl)amino]- l-[3-(2-pyridyl)phenylacetyl)]-3-piperidinol To a 0°C solution of the compound of Example 33(d) in MeOH (30 mL) was added 10% Pd on carbon ( 1.50 g) under a blanket of argon. The mixture was stirred under an atmosphere of hydrogen, while warming to room temperature, until TLC analysis indicated the complete consumption of starting material (30 min). The reaction was filtered through a pad of celite, washed with MeOH and the filtrate was concentrated to give 389 mg of the title compound: MS(ES+) 425.2 (MH+). b.) (3RS,4RS)-4-[[N α -(α-toluenesulphonyl)-L-leucinyI]amino]- l-[3-(2- pyridyl)phenylacetyl)]-3-piperidinol To a solution of the amine of Example 81(a) (0.23 mmol) in CH 2 Ch (2 mL) at 0°C was added N-methylmorpholine (31 uL, 0.28 mmol), and α-toluenesulfonyl chloride (56.0 mg, 0.29 mmol). The reaction mixture was stirred for 2 h whereupon it was diluted with CHCI3 (50 mL), washed with 10% Na 2 Cθ3 and brine, dried (MgS0 4 ), filtered and concentrated to give 129.3 mg of the title compound which was used in the following step without further purification: MS(ES+) 579.3 (MH + ). c.) 4-[[N -(α-toluenesulphonyl)-L-leucinyl]amino]-1 -[3-(2-pyridyl)phenylacetyl)]-3- piperidinone Following the procedure of Example 80(b), except substituting the compound of Example 81(b), the title compound was prepared: MS(ES+) 577.4 (MH + ). Example 82 Preparation of 4-[rN g -(2-naphthylcarbonyl)-L-leucιnvnamιno1-1 -[3-(2- pyπdyl)phenylacetyl)|-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιno]- l-[3-(2- pyπdyl)phenylacetyl)]-3-pιpeπdιnone Following the procedure of Example 81(b), except substituting 2-naphthoyl chloride for α-toluenesulfonyl chloride, the title compound was prepared MS (ES+) 579 3 (MH+) b ) 4-[[N α -(2-naphthy lcarbonyl)-L-leucιnyl]amιno]- 1 -[3-(2-pyπdyl)pheny lacetyl)]-3- pipeπdinone Following the procedure of Example 80(b), except substituting the compound of Example 82 (a), the title compound was prepared and isolated as the higher Rf component by column chromatography MS (ES+) 577 3 (MH+) The lower Rf diastereomer component was also isolated by column chromatography MS (ES+) (MH+) 577 2 Example 83 Preparation of 4-frN°-(benzensulphonyl)-L-leucιnvnamιno]-l -13-(2-pyπdyl)phenylacetyl)1- 3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(benzensulphonyl)-L-leucιnyl]amtno]- 1 -[3-(2-pyπdyl)phenylaccty I)]- 3-pιpeπdιnol Following the procedure of Example 81 (a), except substituting benzenesulfonyl chloride for α-toluenesulfonyl chloride, the title compound was prepared MS(ES+) 565 3 (MH+) b ) 4-[[N α -(benzensulphonyl)-L-leucιnyl]amιno]-l-[3-(2-pyπdyl)phenylacetyl)]-3- pipeπdinone Following the procedure of Example 80(b), except substituting the compound of Example 83(a), the title compound was prepared MS(ES+) 563 4 (MH + ) Example 84 Preparation of 4-rfN g -(3-ιsoquιnohnecarbonyl)-L-leucιnyπamιno1-1 -[3-(2- pyπdyl)phenylacetyl)l-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl|amιno]-l-[3-(2- pyπdyl)phenylacetyl)]-3-pιpeπdιnol To a solution of the compound of 81(a) (0 23 mmol) in CH2G2 (2 mL) was added HOBT (37 6 mg, 0 28 mmol), 3-ιsoquιnohnecarboxyhc acid (48 7 mg, 0 28 mmol), and EDC (53 5 mg, 0 28 mmol) The reaction mixture was stirred at room temperature overnight whereupon it was poured into a rapidly-stirred mixture of EtOAc, 10% Na2C03, and brine (50 mL each) and stirred for 30 min The layers were separated, and the aqueous layer was washed with fresh EtOAc (50 mL), The combined organic layers were washed with 10% Na2Cθ3 and brine, dried (MgS0 4 ), filtered, and concentrated Column chromatography (silica gel, 5 95 MeOH EtOAc) gave 40 7 mg of the title compound MS(ES+) 580 3 (MH+) b) 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno|- l-[3-(2-pyπdyl)phenylacetyI)]-3- pipeπdinone Following the procedure of Example 80(b), except substituting the compound of Example 84 (a), the title compound was prepared MS (ES+) 578 1 (MH+) Example 85 Preparation of 4-13-f (2-pyπdyI)phenylacetyl)lamιnol- 1 -1 f2S)-4-methyl-2- [[(benzyloxycarbonyl)lamιnolpentanoyn-3-pιρeπdιnone a ) (3RS,4RS)-4-[3-[(2-pyπdyl)phenylacetyl)]amιno]- l-(tert-butoxycarbonyl)-3- pipeπdinone To a solution of the amino alcohol of Example 21(d) (434 1 mg, 2 0 mmol) in DMF (5 mL) was added HOBT (299 1 mg, 2.2 mmol), 3-(2-pyπdyl)phenylacetιc acid from Example 33(c) (471.4 mg, 2 2 mmol), and EDC (422 5 mg, 2.2 mmol) The reaction was stirred at room temperature overnight whereupon it was poured into a rapidly stirred mixture of EtOAc, 10% Na2C03, and brine (100 mL each) and stirred for 30 min The layers were separated, and the aqueous layer was washed with fresh EtOAc (100 mL), The combined organic layers were washed with 10% Na2Cθ3 and brine, dried (MgS0 4 ), filtered and concentrated. Column chromatography (silica gel, EtOAc) gave 388 mg of the title compound: MS(ES+) 412.3 (MH+). b.) (3RS,4RS)-4-[3-[(2-pyridyl)phenylacetyl)]amino]-3-piperidinol bis-hydrochloride To a solution of the compound of Example 85(a) was dissolved in 4 N HCl/dioxane (30 mL) and stirred at room temperature for 1.5 h, while monitoring gas evolution with a mineral oil bubbler. The reaction was concentrated and the residue was azeotropically dried to produce the title compound which was used directly in the following step: MS(ES+) 312.3 (MH+). c.) (3RS,4RS)-4-[3-[(2-pyridyl)phenylacetyl)]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinol To a solution of CBZ-Leucine (144.6 mg, 0.55 mmol) in DMF (4 mL) was added the compound of Example 85(b) (0.45 mmol), DIEA (173 uL, 0.99 mmol), HOBT (73.1 mg, 0.54 mmol), and EDC (106.1 mg, 0.55 mmol). The reaction was stirred at room temperature overnight whereupon it was poured into a rapidly stirred mixture of EtOAc, 10% Na2Cθ3, and brine (50 mL each) and stirred for 1 h. The layers were separated, and the aqueous layer was washed with fresh EtOAc (50 mL), The combined organic layers were washed with 10% Na2Cθ3 and brine, dried (MgS0 4 ), filtered and concentrated to give the title compound which was used directly in the following step without further purification: MS(ES+) 559.3 (MH+). d.) 4-[3-[(2-pyridyl)phenylacetyl)]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinone Following the procedure of Example 80(b), except substituting the compound of Example 85(c), the title compound was prepared: MS(ES+) 557.3 (MH + ). Example 86 Preparation of 4-f3-f(2-pyridyI)phenylacetyl)laminol-l-l(2S)-4-methyl-2-[ [2- (pyridinylmethoxycarbonyl)1aminolpentanoyll-3-piperidinone a.) (3RS,4RS)-4-[3-[(2-pyridyl)phenylacetyl)]amino]-l-[(2S)-4-methyl-2-[[(2- pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-piperidinol Following the procedure of Example 85(c), except substituting N-(2- pyridylmethoxycarbonyI)-L-leucine for CBZ-Leucine, the title compound was prepared: MS (ES+) 560.3 (MH+). b.) 4-[3-[(2-pyridyl)phenylacetyl)]amino]-l-[(2S)-4-methyl-2-[[2- (pyridinylmethoxycarbonyl)Jamino]pentanoyl]-3-piperidinone Following the procedure of Example 80(b), except substituting the compound of Example 86(a), the title compound was prepared: MS (ES+) 558.2 (MH + ). Example 87 Preparation of 4-flN g -( " 2-phenylacetyl)-L-leucinyllamino1- 1 -f(2S)-4-methyl-2- ff(benzyloxycarbonyl)laminolpentvn-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(2-phenylacetyl)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyI)]amino]pentyll-3-pyrrolidinol Following the procedure of Example 46(j) except substituting phenylacetic acid for 3-isoquinolinecarboxylic acid gave the title compound: MS(ES+) 567 (MH + ). b.) 4-[[N α -(2-phenylacetyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 87(a), the title compound was produced: MS(ES+) 565 (MH + ). Example 88 Preparation of 4-rfN g -( -butoxyoxycarbonyl)-L-leucinyl laminol- l-f(2S)-4-methyl-2- [f(benzyloxycarbonyl)1aminolpentyll-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 46(h), the title compound was produced: MS(ES+) 547 (MH + ). Example 89 Preparation of 4-f(L-leucιnyl)amιnol- l-[(2S)-4-methyl-2- [f(benzyloxycarbonvπiamιno1pentyll-3-pyrrolιdιnone hydrochlonde Following the procedure of Example 46(ι) except substituting the material of Example 88, the title compound was produced MS(ES+) 447 (MH + ) Example 90 Preparation of 4-[fN g -(2-quιnohnecarbonyl)-L-leucιnyl laminol- 1 -f (2S)-4-methy 1-2- ff(benzyloxycarbonyl)]amιnolpentyll-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(2-quιnohnecarbonyl)-L-leucιnyl[amιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 46(j) except substituting quinaldic acid for 3- lsoquinohnecarboxyhc acid, the title compound was produced MS(ES+) 604 (MH + ) b ) 4-[[N α -(2-quιnohnecarbony l)-L-leucmyl]amιno]- I -f(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the compound of Example 90(a), the title compound was produced MS(ES+) 602 (MH+) Example 91 Preparation of 4-[rN g -(pιperonylcarbonyl)-L-leucιnyl1amιnol-l-[(2S)-4-methyl-2- [f(benzyloxycarbonyl)lamιnolpentyll-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(pιperonylcarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 46(j) except substituting piperonyhc acid for 3-ιsoquιnohnecarboxyhc acid, the title compound was produced MS(ES+) 597 (MH + ) b.) 4-[[N"-(piperonylcarbonyl)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 91 (a), the title compound was produced: MS(ES+) 595 (MH + ). Example 92 Preparation of 4-[[N a -(4-fluorobenzoyl)-L-leucinynamino1-1 -[(2S)-4-methyl-2- l[(benzyloxycarbonyl)lamino]pentyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-fluorobenzoy l)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol Following the procedure of Example 46 j) except substituting 4-fluorobenzoic acid for 3-isoquinolinecarboxylic acid, the title compound was produced: MS(ES+) 571 (MH + ). b.) 4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 92(a), the title compound was produced: MS(ES+) 569 (MH + ). Example 93 Preparation of 4-1 [N g -(2-pyridylcarbonyl)-L-leucinyllaminol- 1 -l(2S)-4-methyl-2- rf(benzyloxycarbonyl)laminolpentyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(2-pyridylcarbonyl)-L-leucinyl3amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol Following the procedure of Example 46(j) except substituting picolinic acid for 3- isoquinolinecarboxylic acid, the title compound was produced: MS(ES+) 554 (MH + ). b.) 4-[[N α -(2-pyridylcarbony l)-L-leuciny l]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 93(a), the title compound was produced: MS(ES+) 552 (MH + ). Example 94 Preparation of 4-[IN g -(2-nitro-α-toluenesulphonyl)-L-leucinyllaminol- l -K2S)-4-methyl-2- H(benzyloxycarbonyl)laminolpentyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(2-nitro-α-toluenesulphonyl)-L-leuciny]]aminol- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol To a solution of Example 46(i) (250 mg, 0.48 mmol) in CH2G2 (10 mL) was added TEA (0.23 mL, 1.68 mmol) followed by 2-nitro-α-toluenesulfonyl chloride (1 19 mg, 0.5 mmol). The reaction was stirred until complete by TLC analysis. Workup and column chromatography ( 10% CH3OH/CH2G2) gave 95 mg of the title compound: MS(ES+) 648 (MH+). b.) 4-[[N α -(2-nitro-α-toluenesulphonyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 94(a), the title compound was produced: MS(ES+) 646 (MH + ). Example 95 Preparation of 4-ffN g -(8-quinolinesulphonyl)-L-leucinyl laminol- 1 -f(2SV4-methyl-2- I[(benzyloxycarbonyl)lamino1pentyπ-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(8-quinolinesulphonyl)-L-leucinyl]amino]- 1 -f(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidino! To a solution of the compound of Example 46(i) (274 mg, 0.53 mmol) in CH2CI2 (10 mL) was added TEA (0.26 L, 1.84 mmol) followed by 8-quinolinesulfonyl chloride (125 mg, 0.55 mmol). The reaction was stirred until complete by TLC analysis. Workup and column chromatography (10% CH3OH/CH2G2) gave 95 mg of the title compound: MS(ES+) 640 (MH + ). b ) 4-[[N α -(8-quιnohnesulphonyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 95(a), the title compound was produced MS(ES+) 638 (MH') Example 96 Preparation of 4-[fN a -(2-naphthylcarbonyl)-L-leucιn llaminomethyl]- 1 -f(2S)-4-methyl-2- f f('benzyloxycarbonyl)lamιnolpentyll-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N"-(2-naphthylcarbonyl)-L-leucιnyl]amιnomethyl[- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 46(e-|) except substituting N-CH3-N-BOC-L- leucine for BOC-L-leucme and naphthoic acid foi 3-ιsoquιnolιnecdrboxyhc acid, the title compound was produced MS(ES+) 617 (MIL) b ) 4-[ [N α -(2-naphthylcarbonyl)-L-leucιnyl]amιnomethyl]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of example 46(k) except substituting the compound of Example 96(a), the title compound was produced MS(ES+) 615 (MH * ) Example 97 Preparation of 4-[[N g -(2-quιnohnylcarbonyl)-L-leucιnyllamιnomethyll- l -f(2S)-4-methyl-2- f[(benzyloxycarbonyl)lamιnolpentyl1-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(2-quιnohnylcarbonyl)-L-leucιnyljamιnomethyl]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 46(e-j) except substituting N-CH3-N-BOC-L- leucme for N-BOC-L-leucine and quinaldic acid for 3-ιsoquιnohnecarboxyhc acid, the title compound was produced MS(ES+) 616 (MH + ) b ) 4-[[N α -(2-quιnolιnylcarbonyl)-L-leucιnyl]amιnomethyl]-l -[(2S)-4-methyl-2- [[(ben/yloxycarbonyl)]amιno]pentyl]-3-pyrrohdmone Following the procedure of Example 46(k) except substituting the compund of Example 97(a), the title compound was produced MS(ES+) 614 (MH + ) Example 98 Preparation of 4-[[N g -(phenylacetyl)-L-leucιnyllamιnol- l-[(2S)-4-methyl-2- ff benzyloxycarbonyl)]amιnolpentyll-3-pιpeπdιnone a ) l-benzyloxycarbonyl- l ,2,3,6-tetrahydropyπdιne To a solution of 1 ,2,3,6-tetrahydropyπdιne (5 4 g, 65 mmol) in CH2G2 (200 mL) at 0°C was added TEA (10 mL, 71 5 mmol) followed by benzyl chloroformate (9 8 mL, 68 3 mmol) in CH2CI2 (50 mL) dropwise The reaction was stirred at 0°C for Ih, room temperature for l h whereupon it was diluted with CH2CI2, washed with I N HCI, water, brine, dried (MgS0 ) and concentrated The residue was chromatographed (40 60 CH 2 C1 2 hexane) to give 8 0 g of title compound MS(ES+) 218(MH + ) b ) l-benzyloxycarbonyl-3,4-epoxy-pιpeπdιne To a solution of the compound of Example 98(a) (8 g, 36 9 mmol) in CH2G2 (200 mL) was added m-CPBA (19 g, 1 1 1 mmol) The reaction was stirred at room temperature overnight whereupon it was concentrated and filtered with petroleum ether The orangic layer was washed with saturated K2CO3 (3 times), water, brine, dried (MgS0 4 ) and concentrated to give a clear colorless oil which was used directly in the next step MS(ES+) 256(M+Na) c ) l-benzyloxycarbonyI-3-hydroxy-4-azιdo-pιpeπdιne To a solution of the compound from Example 98(b) (8 6 g, 36 9 mmol) in methanol water (200 mL of an 8 1 solution) was added ammonium chloride (4 0 g, 73 8 mmol) and sodium azide (4 8 g, 73 8 mmol) The reaction was heated at 50°C for 3h whereupon it was concentrated, diluted with ethyl acetate and washed sequentially with pH 4 buffer, saturated NaHCC>3, water and brine The organic layer was dried (MgS0 4 ), filtered and concentrated to give the title compound ' H NMR (400 MHz, CDCI3) 7 35(m, 5H), 5 l(s, 2H), 4 2(m, 1 H), 3 4(m, 1 H), 2 2 9 (m, 6H) d ) l -benzyloxycarbonyl-3-hydroxy-4-amιno-pιpeπdιne To a solution of the compound of Example 98(c) ( 10 g, 36 9 mmol) in CH3OH (200 mL) was added triethylamine ( 15 4 mL, 1 10 7 mmol) followed by 1 ,3 propanethiol (1 1 0 mL, 10 7 mmol) The reaction was stirred at room temperature overnight whereupon it was concentrated and purified by column chromatography (20 80 methanol ethyl acetate) to give 3 g of the title compound MS(ES+) 251 (MH+) e ) (3RS,4RS)-4-[[N α -(fgrr-butoxycarbonyl)-L-leucιnyl]amιno]- 1 -benzyloxycarbonyl- - pipeπdinol To a solution of the compound of Example 98(d) (3 0 g, 12 mmol) in CH2CI2 (300 L) was added BOC-L-leucine (3 1 g, 12 6 mmol), HOBT ( 1 7 g, 12 6 mmol) and EDC (2 8 g, 15 mmol) The reaction was stirred at room temperature overnight whereupon it was diluted with CH2G2 and washed 0 5 N HCI, sat'd NaHCO^, water and brine The organic layer was dried (MgS0 4 ), filtered and concentrated Column chromatography of the residue (5 95 MeOH CH 2 C1 2 ) gave 4 8 g of the title compound MS(ES+) 464 (MH+) f ) (3RS,4RS)-4-[[N α -(/g/;-butoxycarbonyl)-L-leucιnyl]amιno]- pιpeπdιnol To a solution of the compound of Example 98(e) (3 g, 6 47mmol) in methanol ethyl acetate (1 0 mL of a 1 2 solution) was added 10% Pd/C The mixture shaken with a Parr hydrogenator at approximately 45 psi for 2h The reaction was filtered through a pad of cehte with CH2CI2 and concentrated to give 2 g of the title compound MS(ES+) 330 (MH+) h ) (3RS,4RS)-4-[[N α -(fgr -butoxycarbonyl)-L-leucιnyl]ammo]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol To a solution of the compound of Example 98(0 ( 1 6 g, 4 86 mmol) in CH2CI2 (200 mL) was added CBZ-leucinal (1 8 g, 7 29 mmol) The reaction was allowed to stir at room temperature for 0 5 h whereupon sodium triacetoxyborohydride (2 1 g, 9 72 mmol) was added The reaction was stirred at room temperature for 2h whereupon it was diluted with ethyl acetate, washed with sat'd NaHCθ3, brine, dried (Na2S0 4 ) , filtered and concentrated Column chromatography of the the residue (5 95 methanol CH2CI2) gave 2 g of the title compound MS(ES+) 563 (MH + ) 1 ) (3RS,4RS)-4-[(L-leucιnyl)amιno|- l -[(2S)-4-methyl-2- [[(benzy loxycarbonyl)]ammo]ρenty I J-3-pιpeπdιnol hydi ochloπde To a solution of the compound of Example 98(h) (2 g, 3 6 mmol) in methanol (50 mL) was added 4M HCI in dioxane (50 mL) The reaction was stirred at room overnight whereupon it was concentrated to give 2 2 g of the title compound MS(ES+) 463 (MH + ) j ) (3RS,4RS)-4-[[N α -(phenylacetyl)-L-leucιnyl]amιno]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnoI To a solution of the compound of Example 98(ι) (337 mg, 0 63 mmol) in CH2CI2 ( 10 L) was added TEA (0 22 mL, 1 58 mmol) followed by phenylacetic acid (90 mg, 0 66 mmol), EDC ( 151 mg, 0 78 mmol) and HOBT (89 mg, 066 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography (5% CH3OH/CH2CI2) gave 273 mg of the title compound MS(ES+) 581 (MH+) k ) 4-[[N α -(phenylacetyl)-L-leucιnyl]amιno]- I-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyI]-3-pιperιdmone To a solution of the compound of Example 980) (270 mg, 046 mmol) in DMSO (2 5 mL) was added TEA (0 39 mL, 2 8 mmol) and sulphur trioxide pyridine complex (223 mg, 1 4 mmol) The reaction was stirred at room temperature for 1 h whereupon it was partitioned between ethyl acetate and sat'd NaHCθ3 The organic layer was washed with brine, dried (Na2S0 ), concentrated and the residue chromatographed (5% CH OH/CH 2 Cl2) to give 220 mg of the title compound MS(ES+) 579 (MH+) Example 99 Preparation of 4-[fN g -(4-pyrιdιnylmethoxycarbonyl)-L-leucιnyllamιnol-l -[f2S)-4-methyl- 2-fr(benzyloxycarbonyl )lamιnolpentyπ-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(4-pyrdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l-fg>ι- butoxycarbonyl-3-pιperιdmol To a solution of the amino alcohol of Example 21 (d) (320 mg, 1 48 mmol) in CH2CI2 (20 mL) was added N-(4-pyπdylmethoxycarbonyl)-L-leucιne (415 mg, 1 85 mmol), HOBT (210 mg, 1 55mmol) and EDC (355mg, 1 85mmol) The reaction was allowed to stir at room temperature overnight whereupon it was diluted with CH2CI2 and washed 0 5N HCI, Sat'd NaHCθ , water and bnne The organic was dried (MgS0 4 ), filtered and concentrated Column chromatography of the residue ( 10 90 MeOH CH2CI2) gave 573 mg of the title compound. MS(ES+) 465 (MH+) b ) (3RS,4RS)-4-[[N α -(4-pyrdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-3-pιpeπdιnol bis- hydrochloπde To the compound of Example 99(a) (570 mg, 1.22 mmol) in methanol ( 10 L) was added 4M HCI in dioxane (10 mL) The reaction was stirred at room overnight whereupon it was concentrated to give 536 mg of the title compound MS(ES+) 365 (MH + ) c ) (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl |amιno[- 1 -|(2S)-4-methyl- 2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol Following the procedure of Example 46(h) except substituting the compound of Example 99(b), title compound was produced MS(ES+) 598(MH+) d ) 4-| [N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnone Following the procedure of Example 46(k) except substituting the compound of Example 99(c), the title compound was produced MS(ES+) 596 (MH + ) Example 100 Preparation of 4-[lN g -C4-pyridinylmethoxycarbonyl)-L-leucinyl laminol- 1 -l(2R)-4-methyl- 2-ff(benzyloxycarbonyl)lamιnolpentyH-3-pιpeπdιnone a ) (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l-[(2R)-4-methyl- 2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol Following the procedure of Example 99(c) except substituting CBZ-D-leucinal for CBZ-L-leucinal, the title compound was produced. MS(ES+) 598 (MH + ) b.) 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l -[(2R)-4-methyl-2- f[(benzyloxycarbonyl)]amino]pentyl]-3-piperidinone Following the procedure of Example 46(k) except substituting the compound of Example 100(a), the title compound was produced: MS(ES+) 596 (MH + ). Example 101 Preparation of 4-f fN g -(phenylacetyl)-L-leucinyl laminol- 1 (2R)-4-methyl-2- f[(benzyloxycarbonyl)laminolpentyll-3-piperidinone a.) (3RS,4RS)-4-[[N α -(phenylacetyl)-L-leucinyl]amino|- l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-piperidinol Following the procedure of Example 98(h-j) except substituting CBZ-D-leucinal for CBZ-L-leucinal, the title compound was produced: MS(ES+) 581 (MH + ). b.) 4-[[N α -(phenylacetyl)-L-leucinyl]amino]-l -[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-piperidinone Following the procedure of Example 46(k) except substituting the compound of Example 101(a), the title compound was produced: MS(ES+) 579 (MH + ). Example 102 Preparation of 4-r[N g -(4-imidazoleacet P-L-leucinyllaminol- 1 -1 (2R)-4-methy 1-2- f f(benzyloxycarbonylYlamino]pentyll-3-piperidinone a.) (3RS,4RS)-4-[[N α -(4-imidazoleacetyl)-L-leucinyl]amino]- l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-piperidinol Following the procedure of Example 98(h-j) except substituting CBZ-D-leucinal for CBZ-L-leucinal and 4-imidazoleacetic acid for phenylacetic acid, the title compound was produced: MS(ES+) 571 (MH+). b ) 4-[[N ct -(4-ιmιdazoleacetyl)-L-leucιnyl]amιno]- l -[(2R)-4-methyl-2- [[(benzyloxycarbony!)]amιno]pentyl]-3-pιpeπdιnone Following the procedure of Example 98(k) except substituting the compound of Example 102(a), the title compound was produced MS(ES+) 570 (MH + ) Example 103 Preparation of 4-[[N a -(4-ιmιdazoleacetyl)-L-leucιnyllamιnol- l -f(2S)-4-methyl-2- [Kbenzyloxycarbonyl)lamιnolpentyll-3-pιpendιnone a ) (3RS,4RS)-4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]dmιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol Following the procedure of Example 98(h-j) except substituting 4-ιmιdazoleacetιc acid for phenylacetic acid, the title compound was produced MS(ES+) 57 I (MH + ) b ) 4-[[N α -(4-ιmιdazoleacetyl)-L-letιcmyl]amιno]- l -[(2S)-4-methyI-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnone Following the procedure of Example 98(k) except substituting the compound of Example 103(a), the title compound was produced MS(ES+) 570 (MH + ) Example 104 Preparation of 4-[rN g -(4-pyrιdιnylcarbonyl)-L-leucιnyllamιno]- 1 -f(2S)-4-methyl-2- f f(benzyloxycarbonyl)lamιno1pentyl l-3-pιperιdιnone a ) (3RS,4RS)-4-[[N α -(4-pyπdιnylcarbonyl)-L-leucιnyl]amιnol- l-[(2S)-4-methyI-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol Following the procedure of Example 98(h-j) except substituting isonicotmic acid for phenylacetic acid, the title compound was prepared MS(ES+) 568 (MH+) b ) 4-[[N α -(4-pyπdιnylcarbonyl)-L-leucιnyI]amιno]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnone Following the procedure of Example 98(k) except substituting the compound of Example 104(a), the title compound was produced: MS(ES+) 566 (MH + ). Example 105 Preparation of 4-[[N g -(fg/-/-butoxycarbonyl)-L-leucιnvπamιnol- l -(benzyloxycarbonyl)-3- piperidinone Following the procedure of Example 98(k) except substituting the material of Example 98(e), the title compound was produced: MS (ES) 462 (MH + ). Example 106 Preparation of 4-r[N a -(8-quinohnesulphonyl)-L-leucιnyl laminol- 1 -(benzyloxycarbony D-3- piperidinone a.) (3RS,4RS)-4-[(L-leucinyl)amιno]- 1 -(benzyloxycarbonyl)-3-pipeπdιnol hydrochlonde To the material of Example of 98(e) ( 1.5 g, 3.2 mmol) in methanol ( 10 mL) was added 4M HCI in dioxane ( 10 mL). The reaction was stirred at room overnight whereupon it was concentrated to give lg of the title compound: MS(ES+) 364 (MH + ) b.) (3RS,4RS)-4-[[N α -(8-quιnoIinesulphonyl)-L-leucιnyl]amino]- l -(benzyloxycarbonyl)-3- piperidinol To a solution of the compound of Example 106(a) (250 mg, 0.63 mmol) in CH2CI2 (10 mL) was added TEA (0.22 mL, 1.58 mmol) followed by 8-quιnohnesulfonyl chloride ( 150 mg, 0.66 mmol). The reaction was stirred until complete by TLC analysis. Workup and column chromatography (5% CH3OH/CH2G2) gave 250 mg of the title compound: MS(ES+) 555 ( H+). c.) 4-[[N α -(8-quinolinesulphonyl)-L-leucinyl]amino]- l -(benzyloxycarbonyl)-3-pιpeπdinone Following the procedure of Example 98(k) except substituting the compound of Example 106(b), the title compound was produced: MS(ES+) 553 (MH + ). Example 107 Preparation of 4-ff N g -(4-pyπdιny lacety l)-L-leucιnyl laminol- 1 -(benz loxycarbon yl)-3- pipeπdinone a ) (3RS,4RS)-4-[[N α -(4-pyι ldinylacety l)-L-leucιnyl [ammo]- 1 -(benzyloxycarbonyl)-3- pipeπdinol To a solution of the material of Example 106(a) (250 mg, 0 63 mmol) in CH2CI2 ( 10 mL) was added TEA (0 31 mL, 2 2 mmol) followed by 4-pyπdylacetιc acid hydrochlonde (89 mg, 0 66 mmol), EDC ( 151 mg, 0 78 mmol) and HOBT (89 mg, 0 66 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography ( 10% CH3OH/CH2CI2) gave 213 mg of the title compound MS(ES+) 483 (MH + ) b ) 4-[[N α -(4-pyπdιnylacetyl)-L-leucιnyl]aιτuno]- l -(benzyloxycarbonyl)-3-pιpeπdιnone Following the procedure of Example 46(k) except substituting the material of Example 107(a), the title compound was produced MS(ES+) 481 (MH + ) Example 108 Preparation of 4-[[N a -(4-ιmιdazoleacetyl)-L-leucιnyllamιnol- l-(benzyloxycarbonyl)-3- pipendinone a.) (3RS,4RS)-4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]dmιno)- 1 -(benzyloxycarbonyl)-3- pipeπdinol To a solution of the material of Example 106(a) (250 mg, 0 63 mmol) in CH2CI2 (10 mL) was added TEA (0 22 mL, 1 58 mmol) followed by 4-ιmιdazoleacetιc acid ( 107 mg, 0 66 mmol), EDC ( 151 mg, 0 78 mmol) and HOBT (89 mg, 0 66 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography ( 10% CH3OH/CH2CI2) gave 213 mg of the title compound MS(ES+) 472 (MH+) b ) 4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]amιno]- 1 -(benzyloxycarbonyl)-3-pιpeπdιnone Following the procedure of Example 46(k) except substituting the compound of Example 108(a), the title compound was produced MS(ES+) 470 (MH + ) Example 109 Preparation of 4-F[N α -(4-pyπdιnylcarbonyl)-L-leucιnyllamιno1- 1 -(benzyloxycarbonyl)-3- pipeπdinone a ) (3RS,4RS)-4-[[N α -(4-pyrιdιnylcarbonyl)-L-leucιnyl]amιno]- l-(benzyloxycarbonyl)-3- pipeπdinol To a solution of the material of Example 106(a) ( 100 mg, 0 25 mmol) in CH2CI2 ( l OmL) was added TEA (0 05 mL, 0 38 mmol) followed by lsonicotimc acid (33 mg, 0 26 mmol), EDC (60 mg, 0 31 mmol) and HOBT (35 mg, 0 26 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography ( 10% CH3OH/CH2CI2) gave 100 mg of the title compound MS(ES+) 469 (MH + ) b ) 4-[[N α -(4-pyπdιnylcarbonyI)-L-leucιnyl]amιno]- 1 -(benzyloxycarbonyl)-3-pιpeπdιnone Following the procedure of Example 46(k) except substituting the material of Example 109(a), the title compound was produced MS(ES+) 467 (MH+) Example 1 10 Preparation of l -benzyl-4-irN α -(3-ιsoquιnohnylcarbonyl)-L-leucιnyllamιnol-3- pyrrohdinone a ) (3RS,4RS)-l-benzyl-4-[[N'-(;gr/-butoxyoxycarbonyl)-L-leucιnyI]amιno]-3-pyrrohdιnol To a solution of compound of Example 46(0 (2 g, 6 34 mmol) in CH2G2 (100 mL) was added benzylaldehyde (0 82 mL, 7 6 mmol) The reaction was allowed to stir at room temperature for 0 5h whereupon sodium triacetoxyborohydride (3 36 g, 15 9 mmol) was added The reaction was stirred at room temperature for 2 h whereupon it was diluted with ethyl acetate and washed with sat'd NaHCθ3, brine, dried (Na2S0 4 ), filtered and concentrated Column chromatography of the the residue (5 95 methanol CH2CI2) gave 2 g of the title compound MS(ES+) 406 (MH+) b ) (3RS,4RS)-l -benzyl-4-[(L-leucιnyl)amιno]-3-pyrrohdιnol bis-hydrochloπde To a solution of the compound of Example 1 10(a) (2 g, 4 9 mmol) in methanol (20 mL) was added 4M HCI in dioxane (20 mL) The reaction was stirred at room overnight whereupon it was concentrated to give I 4 g of the title compound MS(ES+) 306 (MH + ) c ) (3RS,4RS)- l -benzyl-4-[[N α -(3-ιsoquιnolιnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnoI To a solution of the compound of Example 1 1 (b) (250 mg, 0 66 mmol) in CH2CI2 (10 mL) was added TEA (0 23 mL, 1 65 mmol) followed by 3-ιsoquιnohnecarboxyhc acid (132 mg, 0 69 mmol), EDC ( 158 mg, 0 82 mmol) and HOBT (94 mg, 0 69 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography (5% CH3OH/CH2G2) gave 180 mg of the title compound MS(ES+) 461 (MH+) d ) l-ben7yl-4-[[N n -(3-ιsoquιnohnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the compound of Example 1 10(c), the title compound was produced MS(ES+) 459 (MH + ) Example 1 1 1 Pieparation of l -ben?yl-4-frN°-(3.4-dιchlorobenzoyl)-L-leιιcιnyl lamιno]-3-pyrιohdιnone a ) (3RS,4RS)-] -benzyl-4-[[N α -(3,4-dιchloroben7oyl)-L-leucιnyl |amιno[-3 pyrrohdinol Following the procedure of Example 1 10(c) except substituting 3,4-dιchlorobenzoιc acid for 3-ιsoquιnohnecarboxyhc acid, the title compound was produced MS(ES+) 478 (MH+) b ) l-benzyl-4-[[N α -(3,4-dιchlorobenzoyl)-L-leucιnyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 111(a), the title compound was produced MS(ES+) 476 (MH + ) Example 1 12 Preparation of 1-benzyl-4-[[N a -(2-naphthylcarbonyl)-L-leucιnyllamιnomethyll-3- pyrrohdinone a.) (3RS,4RS)-4-[[N α -(/grt-butoxyoxycarbonyl)-L-leucinyl|aminomethyl]-3-pyrrolidino! Following the procedure of Example 46(e) except substituting N-CH3-BOC-L- leucine for BOC-L-leucine, the title compound was produced: MS(ES+) 464 (MH+). b.) (3RS,4RS)- 1 -benzyl-4-[(L-leucinyl)aminomethyl]-3-pyrrolidinol Following the procedure of Example 46(f) except substituting the compound of Example 1 12(a), the title compound was produced: MS(ES+) 330 (MH + ). c.) (3RS,4RS)-l -benzyl-4-[[N α -(2-naphthylcarbonyl)-L-leucinyl]aminomethyl]-3- pyrrolidinol Following the procedure of Example 1 lθ(a-c) except substituting the compound of Example 1 12(b) and substituting 2-naphthoic acid for 3-isoquinolinecarboxylic acid, the title compound was produced: MS(ES+) 474 (MH + ). d.) 1 -benzy l-4-[[N -(2-naphthylcarbonyl)-L-leucinyl]aminomethyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 1 12(c), the title compound was produced: MS(ES+) 472 (MH + ). Example 1 1 Preparation of 1 -benzy 1-4-11 N'-(2-quinolinylcarbonyl)-L-leucinyllaminomethy 11-3- pyrrolidinone a.) (3RS.4RS)- 1 -benzyl-4-[[N"-(2-quinolinylcarbonyl)-L-leuciny l]aminomethyl]-3- pyrrolidinol Following the procedure of Example 1 12(c) except substituting quinaldic acid for naphthoic acid, the title compound was produced: MS(ES+) 475 (MH + ). b.) 1 -benzy l-4-[[N'-(2-quinolinylcarbonyl)-L-leucinyl]aminomethyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 1 13(b), the title compound was produced: MS(ES+) 473 (MH + ). Example 1 14 Preparation of l -benz l-4-ffN g -(2-quιnohnylcarbonyl)-L-leucιnvHdmιno]-3-pyrrohdιnone a ) (3RS,4RS)- l-benzyl-4-[[N α -(2-quιnohnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnol Following the procedure of Example 1 10(c) except substituting quinaldic acid for 3-ιsoquιnolιnecarboxyhc acid, the title compound was produced MS(ES+) 461 (MH + ) b ) 1 -benzy l-4-[[N"-(2-quιnohnylcarbonyl)-L-leucιnyi]amιno]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the compound of Example 1 14(a), the title compound was produced MS(ES+) 459 (MH + ) Example 1 15 Preparation of 1-benzyl-4-f[N g -(pιperonylcarbonyl)-L-leucιn llamιnol-3-pyrrolιdιnone a ) (3RS,4RS)- l -benzyl-4-[[N α -(pιperonyIcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnol Following the procedure of Example 1 10(c) except substituting piperony c acid for 3-ιsoquιnolιne carboxyhc acid, the title compound was produced MS(ES+) 454 (MH + ) b ) l-benzyl-4-[[N α -(pιperonylcarbonyl)-L-leucιnyl |amιnoJ-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compund of Example 1 15(a), the title compound was produced MS(ES+) 452 (MH + ) Example 1 16 Preparation of 1 -benzyl-4-f rN g -(4-fluorobenzoyl)-L-leucιnynamιnol-3-pyrrohdιnone a ) (3RS.4RS)- 1 -benzyl-4-[[N α -(4-fluorobenzoy l)-L-leucιny l]amιno]-3-pyrrohdιnol Following the procedure of Example 1 10(c) except substituting 4-fluorobenzoιc acid for 3-ιsoquιnolιnecarboxyhc acid, the title compound was produced MS(ES+) 428 (MH+) b ) l-benzyl-4-[[N D '-(4-fluorobenzoyl)-L-leucιnyl]amιno]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the compound of Example 1 16(a), the title compound was produced- MS(ES+) 426 (MH+) Example 1 17 Preparation of 1 -benzyl-4-f 1 N g -(6-hydroxy-2-naphthylcarbonyl)-L-leucιπyllamιnol-3- pyrrohdinone a ) (3RS,4RS)- l -benzyl-4-ffN α -(6-hydroxy-2-naphthylcarbonyl)-L-leucιnyl]amιno]-3- pyrrohdmol Followed the procedure of Example 1 10(c) except substituting 6-hydroxy-2- naphthoic acid for 3-ιsoquιnohnecarboxyhc acid, the title compound was produced MS(ES+) 476 (MH+) b ) l-benzyl-4-[[N α -(6-hydroxy-2-naphthylcarbonyl)-L-leucιnyl]amιno]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the compound of Example 1 17(a), the title compound was produced MS(ES+) 474 (MH+) Example 1 18 Preparation of 1 -benz l-4-f [N g -(2-naphthylcarbonyl)-L-leucιnyl]amιnoI-3-pyrrohdιnone a.) (3RS,4RS)-l-benzyl-4-[[N"-(2-naphthylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnol Following the procedure of Example 1 10(c) except substituting 2-naphthoιc acid for 3-ιsoquιnohnecarboxyhc acid, the title compound was produced. MS(ES+) 460 (MH + ) b ) l -benzyI-4-[[N α -(2-naphthyIcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 1 18(a), the title compound was produced MS(ES+) 458 (MH + ) Example 1 19 Preparation of l -benzyl-4-f fN g -(6-quιnohnylcarbonyl)-L-leucιnyllamιnol-3-pyrrolιdιnone a ) (3RS,4RS)- 1 -benzyl-4-[[N α -(6-quιnohnylcarbony l)-L-leucιnyl |amιno]-3-pyrrohdιnol Following the procedure of Example 1 10(c) except substituting 6- quinohnecarboxyhc acid for 3-ιsoquιnohnecarboxylιc acid, the title compound was produced MS(ES+) 461 (MH+) b ) l-benzyl-4-[[N α -(6-quιnohnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the compound of Example 1 19(a), the title compound was produced MS(ES+) 459 (MH + ) Example 120 Preparation of l-benzyl-4-[[N g -(4-ιmιdazoleacetyl)-L-leucιnyl lamιnol-3-pyrrolιdιnone a ) (3RS,4RS)-l-benzyl-4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyllamιno]-3-pyrrohdιnol Following the procedure of Example 1 10(c) except substituting 4-ιmιdazoleacetιc acid hydrochlonde for 3-ιsoquιnohnecarboxyhc acid, the title compound was produced MS(ES+) 414 (MH+) b ) 1 -benzy l-4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]amιnol-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 120(a), the title compound was produced MS(ES) 412 (MH + ) Examplel2l Preparation of 1 -benzyl-4-f fN g -(4-ρyrιdιnylcarbonyl)-L-leucιnyllamιno]-3-pyrrohdιnone a ) (3RS,4RS)- l-benzyl-4-[[N α -(4-pyπdιnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnol Following the procedure of Example 1 10(c) except substituting isonicotinic acid for 3-ιsoquιnolιnecarboxyhc acid, the title compound was produced MS(ES+) 41 1 (MH + ) b ) 1 -ben7yl-4-[[N α -(4-pyπdιnylcarbonyl)-L-leucιnyl]amιno]-3-pyιrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 121(a), the title compound was produced MS(ES+) 409 (MH + ) Example 122 Preparation of 4-1 [N a -(fgrf-butoxycarbonyl)-L-leucιny I laminol- 1 -benzyloxycarbonyl-3- pyrrohdinone Following the procedure of Example 46(k) except sustituting the compound of Example 46(e), the title compound was produced MS(ES) 448 (MH + ) Example 123 Preparation of 4-f[N g -(4-pyπdιnylmethoxy)carbonyll-L-leucιnylldmιnol- l -l(2R)-4-methyl- 2-[[(benzyloxycarbonyl)lamιnolpentyl]-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxy)carbonyl]-L-leucιnyl]amιno]- l -[(2R)-4-methyl- 2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrroiιdιnol Following the procedure of Example 46(h) except substituting the compound of Example 47(b) and also substituting CBZ-D-leucinal for CBZ-leucmal, the title compound was produced MS(ES) 584 (MH+) b ) 4-[[N α -(4-pyπdιnylmethoxy)carbonyl]-L-leucιnyl]amιno]- l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrolidιnone Following the procedure of Example 46(k) except substituting the compound of Example 123(a), the title compound was produced: MS(ES+) 582 (MH + ) Example 124 Preparation of 4-1 [N α -(4-pyπdιnylmethoxy)carbonyl 1-L-leucιny 1 laminol- 1 -K2S)-4-methyl- 2-lf(rgrf-butoxycarbonyl)lamιnolpentyl l-3-pyrιolιdιnone a ) (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxy)carbonyl|-L-leucιnyl laminol- 1 -[(2S)-4-methyl- 2-[[(fgrr-butoxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 123(a) except substituting BOC-L-leucinal for CBZ-D-leucinal, the title compound was produced MS(ES) 550 (MH + ) b ) 4-[[N α -(4-pyπdιnylmethoxy)carbonyl]-L-leucιnyl]amιno]- 1 -[(2S)-4-methyl-2-[[(rgA7- butoxycarbonyl)]amιno]pentyl]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the compound of Example 124(a), the title compound was produced MS(ES+) 548 (MH + ) Example 125 Preparation of 4-1 fN g -(4-pyπdιnylmethoxy)carbonyl1-L-leucιnyl laminol- 1-1 (2S)-4-methyl- 2-(amιno)pentyll-3-pyrrohdmone bis-hydrochloπde Following the procedure of Example 46(ι) except sustituting the material of Example 124(b), the title compound was produced MS(ES+) 448 (MH + ) Example 126 Preparation of 4-r[N g -(2-methylpropoxy)carbonyll-L-leucιnyllamιno|-l -[(2S)-4-methyI-2- [[(benzyloxycarbonyl)lamιnolpentyll-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(2-methylpropoxy)carbonyl]-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol To a solution of the compound of Example 46(ι) (274 mg, 0.53 mmol) in CH2CI2 (10 L) was added TEA (0.26 mL, 1.84 mmol) followed by isobutyl chloroformate (0.075 mL, 0 55 mmol) The reaction was stirred until complete by TLC analysis. Workup and column chromatography (10% CH OH/CH2G2) gave 78 mg of the title compound MS(ES+) 549 (MH+) b ) 4-[[N α -(2-methylpropoxy)carbonyl]-L-leucιnyl]amιno]- 1 -[(2S)-4-methyl-2- [ [(benzy loxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 126(a), the title compound was produced MS(ES+) 547 (MH + ) Example 127 Preparation of 4-[[N°-(methylamιno)thιocarbonyll-L-leucιnyllamιnol- l-K2S)-4-methyl-2- ff(benzyloxycarbonyl)lamιnolpeπtyll-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(methy lamιno)thιocarbonyl |-L-leucιnyl]amιno]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol To a solution of the compound of Example 46(ι) (250 mg, 0 48 mmol) in CH2CI2 was added TEA (0 14 mL, 1 mmol) followed by methyl isothiocyanate (0 03 mL, 0 5 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography ( 10% CH3OH/CH2CI2) gave 59 mg of the title compound MS(ES+) 522 (MH + ) b ) 4-[[N α -(methylamιno)thιocarbonyl [-L-leucιnyl]amιno]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 127(a), the title compound was produced MS(ES+) 520 (MH + ) Example 128 Preparation of 4-1 fN a -(phenylmethylamιno carbonyl]-L-leucιnyl laminol- l -K2S)-4-methy I- 2-ir( " benzyloxycarbonyl)lamιnolpentyll-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(phenylmethylamιno)carbonyl]-L-leucιnyl]amιno]- 1 -[(2S)-4-methy 1- 2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol To a solution of the compound of Example 46(ι) (250 mg, 048 mmol) in CH2CI2 (10 mL) was added TEA (0 14 mL, 1 mmol) followed by benzyl isocyanate (006 mL, 0 5 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography ( 10% CH3OH/CH2G2) gave 59 mg of the title compound MS(ES+) 582 (MH+) b ) 4-[[N α -(phenylmethylamιno)carbonyl]-L-leucιnyljamιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyI)]amιno]pentyl]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the compound of Example 128(a), the title compound was produced MS(ES+) 580 (MH + ) Example 129 Preparation of 4-flN g -(3.4-dιchlorophenylamιno)carhonyll-L-leucιnyllamιnol- l -f(2S)-4- methyl-2-ff(benzyloxycarbony01amιnolpentyll-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(3,4-dιchloropheny)amιno)carbonyl]-L-leucιnyl]amιno]- l -[(2S)-4- methyl-2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol To a solution of the compound of Example 46(ι) (250 mg, 0 48 mmol) in CH2CI2 ( 10 mL) was added TEA (0 14 mL, 1 mmol) followed by 3,4-dιchlorophenyl isocyanate (95 mg, 0 5 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography (10% CH3OH/CH2CI2) gave 240 mg of the title compound MS(ES+) 636 (MH+) b ) 4-[[N α -(3,4-dιchlorophenylamιno)carbonyI]-L-leucιnyl]amιno]- 1 -|(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 129(a), the title compound was produced MS(ES+) 634 (MH + ) Example 130 Preparation of l-benzyl-4-f[N g -(3.4-dιchlorophenylamιno)-L-leucιnyl lamιnol-3- pyrrohdinone a ) (3RS,4RS)- l-benzyl-4-[[N α -(3,4-dιchlorophenylammo)-L-leucιnyl |amιno]-3- pyrrohdmol To a solution of the compound of Example 1 1 (b) (250 mg, 0 66 mmol) in CH2 I2 (10 L) was added TEA (0 19 mL, 1 3 mmol) followed by 3,4-dιchlorophenyl isocyanate ( 130 mg, 0 69 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography ( 10% CH3OH/CH2CI2) gave 240 mg of the title compound MS(ES+) 493 (MH+) b ) l-ben/yl-4-|[N α -(3,4-dιchlorophenylamιno)-L-leucιnyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 130(a), the title compound was produced MS (ES) 491 (MH + ) Example 1 1 Preparation of 4-[[N g -( 1.2.3,4-tetrahydro-6-quιnolιnecarbonyl)-L-leucιnyllamιno]- 1 -K2S)- 4- methy 1-2-11 (p-toluenesulphonyl)lamιno1pentyll-3-pyrrohdιnone a ) (3RS,4RS)-4-[ [N α -( 1 ,2,3,4-tetrahydro-6-quιnohnecarbonyl)-L-leucιny 1 Jamino]- 1 -f(2S)- 4-methyl-2-amιnopentyl]-3-pyrrohdιnol To a solution of the compound of Example 65(a) (2 2 g, 3 6 mmol) in methanol ethyl acetate (200 mL of a 1 2 solution) was added 10% Pd on carbon The mixture was shaken on a Parr hydrogenator for 2h at approximately 40 psi The reaction was filtered through a pad of cehte with CH2CI2 and concentrated to give 1 73 g of the title compound MS(ES+) 474 (MH+) b ) (3RS,4RS)-4-[[N α -(l ,2,3,4-tetrahydro-6-quιnohnecarbonyl)-L-leucιnyl]amιno]- l -[(2S)- 4-methyl-2-[(p-toluenesulphonyl)amιno]pentyl]-3-pyrrohdιnol To a solution of the material from Example 131(a) (300 mg, 063 mmol) in CH2G2 (20 mL) was added TEA (0 I mL, 069 mmol) followed by p-toluenesulfonyl chloride ( 127 mg, 0 66 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography (5% CH3OH CH2G2) gave 260 mg of the title compound MS(ES+) 628 (MH+) c ) 4-[[N α -(l ,2,3,4-tetrahydro-6-quιnohnecarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [(p-toluenesulphonyl)amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 131(b), the title compound was produced MS(ES+) 626 (MH + ) Example 132 Preparation of 4-riN a -π .2.3.4-tetrahydro-6-quιnohnecarbonyl)-L-leucιnyl laminol- 1 -K2S)- 4-nιethyl-2-H(acetyl)lamιnolpentyll-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(l ,2,3,4-tetrahydro-6-quιnohnecarbonyl)-L-leucιnyl]amιno]-l -[(2S)- 4-methyl-2-[(acetyl)amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 131 (b) except substituting acetyl chloride foi p-toluenesulfonyl chloride, the title compound was prepared MS(ES+) 516 (MH + ) b ) 4-[[N α -(l ,2,3,4-tetrahydro-6-quιnohnecarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [(acetyl)amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 132(a), the title compound was produced MS(ES+) 514 (MH + ) Example 133 Preparation of 4-[[N g -(4-fluorobenzoyl)-L-leucιnyl laminol- 1 -r(2S)-4-methyl-2- Uacetyl)amιnolpentyn-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]-l -[(2S)-4-methyl-2- amιnopentyl]-3-pyrrolιdιnol To a solution of the compound of Example 92(a) ( 1.9 g, 3.3mmol) in methanohethyl acetate (200 mL of a 1 2 solution) was added 10% Pd on carbon The mixture was shaken on a Parr hydrogenator for 2h at approximately 45 psi The reaction was filtered through a pad of cehte with CH2 I2 and concentrated to give 1.2 g of the title compound: MS(ES+) 437 (MH+) b ) (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucmyl]amιno]- 1 -[(2S)-4-methyl-2- [(acetyl)amιno]pentyl]-3-pyrrohdιnol To a solution of the material of Example 133(a) (250 mg, 0.57 mmol) in CH2CI2 (20 mL) was added TEA (0.1 L, 0.63 mmol) followed by acetyl chloride (0.04 mL, 0.6 mmol). The reaction was stirred until complete by TLC analysis. Workup and column chromatography ( 10% CH3OH/CH2CI2) gave 190 mg of the title compound: MS(ES+) 479 (MH+). c.) 4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2-[(acetyl)amino]pentyl]- 3-pyrrolidinone Following the procedure of Example 46(k) except substituting the material from Example 133(b), the title compound was produced: MS(ES+) 477 (MH + ). Example 134 Preparation of 4-1 lN a -(4-fluorobenzoyl)-L-leucinyl laminol- 1 -1 (2S)-4-methyl-2-Kp- toluenesulphonyl)aminolpentyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]- l -[(2S)-4-methyl-2-[(p- toluenesulphonyl)amino]pentyl]-3-pyrrolidinol Following the procedure of Example 133(b) except substituting p-toluenesulfonyl chloride for acetyl chloride, the title compound was prepared: MS(ES+) 591 (MH + ). b.) 4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2-|(p- toluenesulphonyl)amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the material from Example 134(a), the title compound was produced: MS(ES+) 589 (MH + ). Example 135 Preparation of 4-r[N g -(4-fluorobenzoyl)-L-leucinyl]aminol-1-[(2S)-4-methyl-2- [(methanesulphonyl)aminolpentyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [(methanesulphonyl)amino]pentyl]-3-pyrrolidinone Following the procedure of Example 133(b) except substituting methanesulfonyl chloride for acetyl chloride, the title compound was prepared MS(ES+) 515 (MH + ) b ) 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [(methanesulphonyl)amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the material from Example 135(a), the title compound was produced MS(ES+) 513 (MH + ) Example 136 Preparation of 4-ffN g -(4-fluorobenzov0-L-leucιnyllamιnol-l -lC2S)-4-methyl-2-Kα- toluenesulphonyl)amιnolpentyll-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιnol- 1 -[(2S)-4-methyl-2-[(α- toluenesulphonyl)amιno]pentyl[-3-pyrrohdιnone Following the procedure of Example 133(b) except substituting α-toluenesulfonyl chloride for acetyl chloride the title compound was prepared MS(ES+) 591 (MH + ) b ) 4-[[N u -(4-fluorobenzoyl)-L-leucιnyl]amιno|- l -[(2S)-4-methyI-2-[(α- toluenesulphonyl)amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the material from Example 135(a), the title compound was produced: MS(ES+) 589 (MH + ) Example 137 Preparation of l-(2-pheπethyl)-4-ffN a -(4-fluorobenzoyl)-L-leucιnyllamιnol-3-pyrrohdιnone a ) (3RS,4RS)- l-(2-phenethyl)-4-[[N α -(/gr/-butoxycarbonyl)-L-leucιnyl]amιno]-3- pyrrolidinol Following the procedure of Example 1 10(a) except substituting phenylacetaldehyde for benzylaldehyde, the title compound was produced MS(ES+) 420 (MH + ) b ) (3RS,4RS)- l -(2-phenethyl)-4-[(L-leucιnyl)amιnoJ-3-pyrrohdιnol hydrochlonde Following the procedure of Example 1 10(b) except substituting the compound of Example 137(a), the title compound was produced MS(ES+) 320 (MH + ) c ) (3RS,4RS)- l-(2-phenethyl)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]-3-pyrrohdιnol Following the procedure of Example 1 10(c) except substituting 4-fluorobenzoιc acid for 3-ιsoquιnoiιnecarboxyhc acid, the title compound was produced MS(ES+) 442 (MH+) d ) l-(2-phenethyl)-4-[[N <x -(4-fluorobenzoyl)-L-leucιnyl]amιno]-3-pyπohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 1 7(c), the title compound was produced MS(ES+) 440 (MH + ) Example 138 Preparation of l -(2-phenethyl)-4-[rN g -(2-quιnohnylcarbonyl)-L-leucιnyllamιnol-3- pyrro dinone a ) (3RS,4RS)- l-(2-phenethyl)-4-[[N α -(2-quιnohnylcarbonyl)-L-leucιnyl]amιno]-3- pyrrohdinol Following the procedure of Example 137(c) except substituting quinaldic acid for 4-fluorobenzoιc acid, the title compound was prepared MS(ES+) 475 (MH * ) b ) l -(2-phenethyI)-4-[[N -(2-quιnohnylcarbonyl)-L-leucmyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the material of Example 138(a), the title compound was produced MS(ES+) 473 (MH + ) Example 139 Preparation of l-(2-phenethyl)-4-flN g -(2-naphthylcarbonyl)-L-leucιnyllamιnol-3- pyrrohdinone a ) (3RS,4RS)- l -(2-phenethyl)-4-[[N J -(2-naphthylcarbonyl)-L-leucιnyl |dmιno]-3- pyrrohdinol Following the procedure of Example 137(c) except substituting 2-naphthoιc acid for 4-fluorobenzoιc acid, the title compound was produced MS(ES+) 474 (MH + ) b ) 1 -(2-phenethyl)-4-[ [N -(2-naphthylcarbony l)-L-leucιnyl ]amιno]-3-pyrrolιdιnone Following the procedure of Example 46(k) except substituting the material of Example 139(a), the title compound was produced MS(ES+) 472 (MH+) Example 140 Preparation of l-(2-phenethyl)-4-r[N u -(α-toluenesulphonyl)-L-leucιnyllamιnol-3- pyrrohdinone a ) (3RS,4RS)- l -(2-phenethyl)-4-[[N α -(α-toluenesulphonyl)-L-leucιnyl]dmιno]-3- pyrrohdinol Following the procedure of Example 131(b) except substituting the compound of Example 137(b) and α-toluenesulfonyl chloride for p-toluenesulfonyl chloride, the title compound was produced MS(ES+) 474 (MH + ) b ) l-(2-phenethyl)-4-[[N α -(α-toluenesulphonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the material of Example 140(a), the title compound was produced MS(ES+) 472 (MH+) Example 141 Preparation of 1 -(2-phenethyl)-4-[[N g -(2-nιtro-α-toluenesulphonyl)-L-leucιnyl lamιno]-3- pyrrohdinone a ) (3RS,4RS)-l-(2-phenethyl)-4-[[N u -(2-nιtro-α-toluenesulphonyl)-L-leucmyl]amιno]-3- pyrrohdinol Following the procedure of Example 140(a) except substituting 2-nιtro-α- toluenesulfonyl chloride for α-toluenesulphonyl chloride, the title compound was produced MS(ES+) 519 (MH+) b ) l -(2-phenethyl)-4-[[N α -(2-nιtro-α-toluenesulphonyl)-L-leucιnyl]amιno]-3 pyrrohdinone Following the procedure of Example 46(k) except substituting the material of Example 141 (a), the title compound was produced MS(ES+) 517 (MH + ) Example 142 Preparation of 4-HN g -(2-phenylacetyl)-L-leucιnyllamιnol- l -f(2S)-4-methyl-2-l [f4- pyrιdιnylcarbonyl)1dmιnolpentyn-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N α -(2-phenylacetyl)-L-leucιnyl]amιno]-1 -[(2S)-4-methyl-2- (amιno)pentyl]-3-pyrrohdιnoI To a solution of the compound of Example 87(a) ( 1 g, 1 76 mmol) in methanol ethyl acetate (200 mL of a 1 2 solution) was added 10% Pd on carbon The mixture was placed on a Parr hydrogenator for 2h at approximately 45 psi The reaction was filtered through a pad of cehte with CH2CI2 and concentrated to give 740 mg of the title compound MS(ES+) 433 (MH+) b ) (3RS,4RS)-4-[[N α -(2-phenylacetyl)-L-leucιnyI]amιnol-l-[(2S)-4-methyl-2-[[(4- pyπdιnylcarbonyl)]amιno]pentyl]-3-pyrrohdιnol To a solution of the compound of Example 142(a) (247 mg, 0 57 mmol) in CH2CI2 (10 L) was added isonicoti c acid (74 mg, 0 6 mmol) followed by EDC ( 1 7 mg, 0 7 mmol) and HOBT (81 mg, 0 6 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography (5% CH3OH/CH2CI2) gave 180 mg of the title compound MS(ES+) 538 (MH + ) c ) 4-[[N α -(2-phenylacetyl)-L-leucιnylJamιno]-1-[(2S)-4-methyl-2-[[(4- pyπdιnylcarbonyI)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 142(b), the title compound was produced MS(ES+) 536 (MH + ) Example 143 a ) (3RS,4RS)-4-[[N α -(2-phenylacetyl)-L-leucιnylldmιno]- 1 -[(2S)-4-methyl-2-(|(p- toluenesulphonyl)]amιno]pentyl]-3-pyrιohdιnol To a solution of the compound of Example 142(a) (247 mg, 0 57 mmol) in CH2CI2 (10 mL) was added TEA (0 1 mL, 0 7 mmol) followed by p-toluenesulfonyl chloride ( 1 14 mg, 0 6 mmol) The reaction was stirred until complete by TLC analysis Workup and column chromatography (5% CH3OH/CH2CI2) gave 300 mg of the title compound MS(ES+) 587 (MH+) b ) 4-[[N α -(2-phenylacetyl)-L-leucιnylJamιno)- l-[(2S)-4-methyl-2-[l(p- toluenesulphonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 143(a), the title compound was produced MS(ES+) 585 (MH + ) Example 144 Preparation of 4-riN g -(2-phenylacetv0-L-leucιnyllamιnol- l -|(2S)-4-methyl-2-| [(4- ιmιdazoleacetv01amιnolpentyll-3-pyrrolιdιnone a ) (3RS,4RS)-4-[[N β -(2-phenylacetyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2-[[(4- ιmιdazoleacetyl)]amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 142(b) except substituting 4-ιmιdazoleacetιc acid for isonicotinic acid, the title compound was produced MS(ES+) 541 (MH + ) b ) 4-[[N α -(2-phenylacety l)-L-leucιnyl]amιno]- 1 -[(2S)-4-methyl-2-[[(4- ιmιdazoleacetyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 144(a), the title compound was produced MS(ES+) 539 (MH + ) Example 145 Preparation of 4-l(4-phenoxybenzoyl)amιnol- l -ff2S)-4-methyl-2- lKbenzyloxycarbonyl)lamιno]pentanoyπ-3-pyrrohdιnone a ) (3RS,4RS)-4-[(4-phenoxybenzoyl)ammo]- l-[(2S)-4-methyl-2- [ [(benzy loxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnol Following the procedure of Example 1 (e-g) except substituting 4-phenoxybenzoιc acid for CBZ-leucine in step 1(e), the title compound was produced MS(ES+) 546.3 (MH+), 568 2 (M+Na) b ) 4-[(4-phenoxybenzoyl)amιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyI)]amιno[pentanoyl]-3-pyrrolιdιnone Following the procedure of Example 1 (h) except substituing the compound of Example 145(a), the title compound was produced MS(ES+) 544 2 (MH + ) Example 146 Preparation of l-benzyl-4-flN -[(4-pyπdιnylmethoxy)carbonyll-L-leuunyl lamιnol-3 pyrrohdinone a ) (3RS,4RS)- 1 -benzyl-4-[[N -[(4-pyπdιnylmethoxy)carbonyl]-L-leu nyl]amιno]-3- pyrrolidmol To a solution of the compound of Example 47(b) (383 mg, 0 91 mmol) in CH2CI2 (20 mL) was added TEA (0 25 mL, 1 81 mmol) followed by benzylaldehyde (0 1 1 mL, 1 1 mmol) The reaction was allowed to stir at room temperature for 0 5 h whereupon sodium triacetoxyborohydride (423 mg, 2 mmol) was added The reaction was stirred at room temperature for 2 h whereupon it was diluted with ethyl acetate and washed with sat'd NaHCθ3, brine, dried (Na2S0 4 ) , filtered and concentrated Column chromatography of the the residue (5 95 methanol CH2CL2) gave 210 mg of the title compound MS(ES+) 441 (MH+) b ) l-benzyl-4-[[N α -[(4-pyndιnylmethoxy)carbonyl]-L-leucιnyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 146(a), the title compound was produced: MS(ES+) 439 (MH + ). Example 147 Preparation of 1 -(2-naphthylmethyl)-4-[[N a -(4-pyridinylmethoxycarbonyl)-L- leucinyl laminol-3-pyrrolidinone a.) (3RS,4RS)- l-(2-naphthylmethyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]aminoj-3-pyrrolidinol Following the procedure of Example 146(a) except substituting 2-naphthaldehydc for benzylaldehyde, the title compound was produced: MS(ES+) 491 (MH + ). b.) l -(2-naphthylmethyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 147(a), the title compound was produced: MS(ES+) 489 (MH + ). Example 148 Preparation of 1 -(3-cyanobenzyl)-4-f [N a -(4-pyridinylmethoxycarbonyl)-L-leuciny llaminol- 3-pyrrolidinone a.) (3RS,4RS)- 1 -(3-cyanobenzyl)-4-[[N α -(4-pyridiny lmethoxycarbony 1)-L- leucinyl]amino]-3-pyrrolidinol Following the procedure of Example 146(a) except substituting 3- cyanobenzaldehyde for benzylaldehyde, the title compound was produced: MS(ES+) 466 (MH+). b.) l -(3-cyanobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 148(a), the title compound was produced: MS(ES+) 464 (MH+). Example 149 Preparation of 1 - -amidobenzyl)-4-[rN a -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminol- 3-pyrrolidinone a.) (3RS,4RS)-l -(3-amidobenzyl)-4-[[N"-(4-pyridinylmethoxycarbonyl)-L-leucinyllamino]- 3-pyrrolidinol To a solution of the compound of Example 148(a) ( 160 mg, 0.34 mmol) in DMSO (4 mL) was added H2O2 (0.5 mL) followed by 29 mg of K2CO3. The reaction was stirred at room temperature of 1 h whereupon is was diluted with ethyl acetate and washed with water, brine, dried (Na2S0 4 ) and concentrated to give the title compound: MS(ES+) 484 (MH+). b.) l -(3-amidobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 149(a), the title compound was produced: MS(ES+) 482 (MH + ). Example 150 Preparation of l-(3-nitrobenzyl)-4-[fN g -(4-pyridinylmethoxycarbonyl)-L-leucinyllaminol- 3-pyrrolidinone a.) (3RS,4RS)- 1 -(3-nitrobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- 3-pyrrolidinol Following the procedure of Example 146(a) except substituting 3- nitrobenzaldehyde for benzylaldehyde, the title compound was produced: MS(ES+) 486 (MH+). b.) l-(3-nitrobenzyl)-4-[[N°-(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of example 46(k) except substituting the compound of Example 150(a), the title compound was produced: MS (ES) 484 (MH + ). Example 151 Preparation of l-(2-nitrobenzyiy4-[[N g -(4-pyridinylmethoxycarbonvI)-L-leucinyllaminol- 3-pyrrolidinone a.) (3RS,4RS)-l-(2-nitrobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- 3-pyrrolidinol Following the procedure of Example 146(a) except substituting 2- nitrobenzaldehyde for benzylaldehyde, the title compound was produced: MS(ES+) 486 (MH+). b.) l-(2-nitrobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 151(a), the title compound was produced: MS(ES+) 484 (MH + ). Example 152 Preparation of l-(4-cyanobenzyl)-4-lfN g -(4-pyridinylmethoxycarbonylVL-leucinyl]aminol- 3-pyrrQli<hnς>ne a.) (3RS,4RS)-l-(4-cyanobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinol Following the procedure of Example 146(a) except substituting 4- cyanobenzaldehyde for benzylaldehyde, the title compound was produced: MS(ES+) 466 (MH+). b.) 1 -(4-cyanobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 152(a), the title compound was produced: MS(ES+) 464 (MH + ). Example 153 Preparation of 1 -l4-hromobenzyl)-4-rrN g -(4-pyridinylmethoxycarbonyl )-L- leucinyllaminol-3-pyrrolidinone a.) (3RS.4RS)- 1 -(4-bromobenzy l)-4-[[N α -(4-pyridinylmethoxycarbony 1)-L- leucinyl]amino]-3-pyrroIidinoI Following the procedure of Example 146(a) except substituting 4- bromobenzaldehyde for benzylaldehyde, the title compound was prepared: MS(ES+) 520 (MH+). b.) I-(4-bromobenzyI)-4-[[N α -(4-pyridinylmethoxycarbonyI)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 153(a), the title compound was produced: MS(ES+) 518 (MH + ). Example 154 Preparation of 1 -phenethyl-4-[[N g -(4-pyridinylmethoxycarbony l)-L-leucinvnaminol-3- pyrrolidinone a.) (3RS,4RS)-l-phenethyl-4-[[N a -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinol Following the procedure of Example 146(a) except substituting phenylacetaldehyde for benzylaldehyde, the title compound was produced: MS(ES+) 455 (MH + ). b.) l-phenethyl-4-[[N α -(4-pyridinylmethoxycarbonyI)-L-leucinyl]amino]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 154(a), the title compound was produced: MS(ES+) 453 (MH + ). Example 155 Preparation of 1 -(3-amιnoben7yl)-4-frN a -(4-pyrιdιnylmethoxycaιbonyl)-L-leucιnyl ]amιnol- 3-pyrrolιdιnone To the compound of Example 150(b) (20 mg, 0 04 mmol) in ethanol (2 mL) was added SnCl2 (20 mg, 0 1 mmol) followed by Na2CU (8 mg, 0.08 mmol) The reaction was stirred at room temperature overnight whereupon is was diluted with ethyl acetate and washed with sat'd NaHC0 , water, brine, dried (Na2S0 4 ) and concentrated to give the title compound MS(ES+) 454 (MH+) Example 156 Preparation of 1 -(3-ben7yloxybenzy l)-4-f [N"-(4-pyπdιnylmethoxycarbonyl)-L- leucιnyllamιnol-3-pyrrohdιnone a ) (3RS,4RS)-l-(3-benzyloxybenzyl)-4-[[N J -(4-pyπdιnylmethoxycarbonyl)-L- leucιnyl]amιno]-3-pyrrohdιnol Following the procedure of Example 146(a) except substituting 3- benzyloxybenzaldehyde for benzylaldehyde, the title compound was produced MS(ES+) 547 (MH+) b ) I-(3-benzyloxybenzyl)-4-[[N u -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-3- pyrrohdinone Following the procedure of Example 46(k) except substituting the compound of Example 156(a), the title compound was produced. MS(ES) 545 (MH + ) Example 157 Preparation of l-G-hydoxybenzyl ι-4- [N g -(4-pyridinylmethoxycarbonyl)-L- leucιnyllaminol-3-pyrrolidιnone a ) (3RS,4RS)-l-(3-hydroxybenzyl)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L- leucιnyl]amιno]-3-pyrrohdιnol Following the procedure of Example 146(a) except substituting 3- hydroxybenzaldehyde for benzylaldehyde, the title compound was produced MS(ES+) 457 (MH+) b ) l-(3-hydroxybenzyl)-4-[[N α -(4-pyπdιnylmethoxycarbonyI)-L-leucιnyl]amιno]-3- pyrrohdinone Following the procedure of Example 46(k) except substituting the compound of Example 157(a), the title compound was produced MS(ES+) 455 (MH + ) Example 158 Preparation of 1 -ethyl-4-f [N a -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyllamιnol-3- pyrrohdinone a ) (3RS,4RS)-l-ethyl-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιnol-3- pyrrohdinol To a solution of the compound of Example 47(b) (300 mg, 0 71 mmol) in DMF ( 10 mL) was added bromoethane (0 06 mL, 0 85 mmol), Na2C0 (393 mg, 2 84 mmol) and a catalytic amount of KI The reaction was stirred at room overnight whereupon it was diluted with ethyl acetate, washed with sat'd N HCU3, brine, dried (Nd2S0 4 ), concentrated and chromatographed (20%CH3θH CH2CI2) to give 120 mg of the title compound MS(ES+) 379 (MH+) b ) 1 -ethyl-4-[[N α -(4-pyπdιnylmethoxycarbony l)-L-leucιnyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 158(a), the title compound was produced MS(ES+) 377 (MH + ) Example 159 Preparation of 1 -cyclopropy lmethyl-4-[[N g -(4-pyπdιny lmethoxycarbonyll-L- leucιnyllamιnol-3-pyrrohdιnone a.) (3RS,4RS)-l -cyclopropylmethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinol To a solution of the compound of Example 47(b) (300 mg, 0.71 mmol) in DMF ( 10 mL) was added bromomethylcyclopropane (0.08 mL, 0.85 mmol), Na2Cθ (393 mg, 2.84 mmol) and a catalytic amount of KI. The reaction was stirred at room overnight whereupon it was diluted with ethyl acetate, washed with sat'd NaHCθ3, brine, dried (Na2S0 4 ), concentrated and chromatographed (20%CH3θH:CH2Cl2) to give 120 mg of the title compound: MS(ES+) 405 (MH+). b.) l-cyclopropylmethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 159(a), the title compound was produced: MS(ES+) 403 (MH + ). Example 160 Preparation of 1 -(2-N.N-dimeth ylaminoethyl V-4-1I N g -(4-pyridin ylmetho vcarbonyl)-L- leucinyllaminol-3-pyrrolidinone a.) (3RS,4RS)- l-(2-N,N-dimethylaminoethyl)-4-[|N α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinol To a solution of the compound of Example 47(b) (383 mg, 0.91 mmol) in ethanol (10 mL) was added 2-dimethylaminoethyl chloride hydrochloride ( 158 mg, 1.1 mmol), Na2Cθ3 (250 mg, 1.81 mmol) and a catalytic amount of KI. The reaction was refluxed for 6 h whereupon it was diluted with ethyl acetate, washed with sat' NaHCθ , brine, dried (Na2S0 ), concentrated and chromatographed (25% CH3θH:CH2Cl2) to give 150 mg of the title compound: MS(ES+) 422 (MH+). b.) l-(2-N,N-dimethylaminoethyI)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 160(a), the title compound was produced: MS(ES+) 420 (MH + ). Example 161 Preparation of 1 -C2-morpholinoethyl)-4-f rN g -(4-pyridinylmethoxycarbonyl)-L- leucinyllaminol-3-pyrrolidinone a.) (3RS,4RS)- 1 -(2-morpholinoethyl)-4-[[N α -(4-pyridiny lmethoxycarbony!)-L- leucinyl]amino]-3-pyrrolidinonol To a solution of the compound of Example 47(b) (400 mg, 0.95 mmol) in ethanol (10 mL) was added N-(2-chloroethyl)morpholine hydrochloride ( 194 mg, 1.1 mmol), Na2Cθ3 (525 mg, 3.8 mmol) and a catalytic amount of KI. The reaction was refluxed for 6h whereupon it was diluted with ethyl acetate, washed with sat' NaHCθ3, brine, dried (Na2S0 4 ), concentrated and chromatographed (10% CH3θH:CH2Cl2) to give 80 mg of the title compound: MS(ES+) 464 (MH+). b.) l-(2-morpholinoethyl)-4-[[N -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 161(a), the title compound was produced: MS(ES+) 462 (MH + ). Example 162 Preparation of l-(2-bromobenzyl)-4-f[N g -(2-pyridinylmethoxycarbonyl)-L- leucinyllaminol-3-pyrrolidinonone a.) (3RS,4RS)-4-[[N α -(2-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3-pyrrolidinol bis- hydrochloride Following the procedure of Example 47(a-b) except substituting N-(2- pyridylmethoxycarbonyl)-L-leucine for N-(4-pyridylmethoxycarbonyl)-L-leucine, the title compound was prepared: MS(ES+) 351 (MH + ). b.) (3RS,4RS)- 1 -(2-bromobenzyl)-4-[[N α -(2-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinonoI To a solution of the compound of Example 162(b) (200 mg, 0.47 mmol) in CH2CI2 (20 mL) was added TEA (0.08 mL, 0.57 mmol) followed by 3-bromobenzylaldehyde (0.07 mL, 0.57 mmol). The reaction was allowed to stir at room temperature for 0.5 h whereupon sodium triacetoxyborohydride ( 120 mg, 0.57 mmol) was added. The reaction was stirred at room temperature for 2 h whereupon it was diluted with ethyl acetate and washed with sat'd NaHCθ3, brine, dried (Na2S0 4 ) , filtered and concentrated. Column chromatography of the the residue (5:95 methanol: CH2CI2) gave 210 mg of the title compound: MS(ES+) 521 (MH+), c.) l-(2-bromobenzyl)-4-[[N α -(2-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinonone Following the procedure of Example 46(k) except substituting the compound of Example 162(c), the title compound was produced: MS(ES+) 519 (MH + ). Example 163 Preparation of 4- f rN ffl -(4-pyrdinylmethoxy)carbonv0-L-leucinyl laminol- 1 -1 (2SV-4-methy 1- 2-[f(benzyloxycarbonyl)laminolpentyll-3-pyrrolidinone a.) (3RS,4RS)-4-[[N σ -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl]amino|- !-[(2S)-4-methyl- 2-[[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol Following the procedure of Example 146(a) except substituting CBZ-leucinal for benzylaldehyde, the title compound was prepared: MS(ES+) 584 (MH + ). b.) 4-[[N -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyI]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 163(a), the title compound was produced: MS(ES+) 582 (MH + ). Example 164 Preparation of 441 N g -(4-pyrdinylmethoxy)carbonyl)-L-leucinyllaminol- 1 -1 (2S)-4-methy 1- 2-IKbenzyloxycarbonyl)laminomethyl]pentyl1-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl]amino]- l-[(2S)-4-methyl- 2-[[(benzyloxycarbonyl)]aminomethyl]pentyl]-3-pyrrolidinol Following the procedure of Example 146(a) except substituting N-methyl-CBZ- leucinal for benzylaldehyde, the title compound was produced: MS(ES+) 598 (MH + ). b.) 4-[[N α -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [ [(benzy loxycarbonyl)]aminomethyl]pentyl]-3-pyrroIidinone Following the procedure of Example 46(k) except substituting the compound of Example 164(a), the title compound was produced: MS(ES+) 596 (MH + ). Example 165 Preparation of 4-f [N g -f(2-pyridinylmethoxy)carbonyll-L-leucinyllaminol- l-[(2S)-4-methyl- 2-[[(benzyloxycarbonyl)laminolpentvn-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -[(2-pyridinylmethoxy)carbony!]-L-leucinyl]amino]- 1 -[(2S)-4-methy 1- 2-[[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol Following the procedure of Example 46(h) except substituting the compound of Example 162(a), the title compound was produced: MS(ES+) 584 (MH + ). b.) 4-[[N α -[(2-pyridinylmethoxy)carbonyl]-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 165(a), the title compound was produced: MS(ES+) 582 (MH + ). Example 166 Preparation of 4-[fN g -[(3-pyridinylmethoxy)carbonyn-L-leucinynaminol-l-f(2S)-4-methyl- 2-rf(benzyloxycarbonyl)]amino1pentvn-3-pyrrolidinone a.) (3RS,4RS)-4-[[N α -(3-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3-pyrrolidinol bis- hydrochloride Following the procedure of Example 162(a) except substituting N-(3- pyπdyimethoxycarbony])-L-leucιne for N-(2-pyπdylmethoxycarbonyl)-L-leucιne, the title compound was prepared MS(ES+) 351 (MH + ) b ) (3RS,4RS)-4-[[N α -[(3-pyπdιnylmethoxy)carbonyl]-L-leucιnyl]amιno]- l-[(2S)-4- methyl-2-[ [(benzy loxycarbonyl)]amιno]pentyI]-3-pyrrohdιnol Following the procedure of Example 165(a) except substituting the compound of Example 166(a), the title compound was produced MS(ES+) 584 (MH + ) c ) 4-[[N α -[(3-pyπdιny lmethoxy )carbony l]-L-leucιny l]amιno]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 166(b), the title compound was produced MS(ES+) 582 (MH * ) Example 167 Preparation of 4-[fN g -(benzyloxycarbonyl)-L-leucιnyllamιnol- l -K2S)-4-methyl-2- [f(benzyloxycarbonyl)lamιnolpentyl l-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -|(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol Following the procedure of Example 46(h) except substituting the compound of Example 1(0, the title compound was prepared MS(ES+) 583 (MH + ) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 167(a), the title compound was produced MS(ES+) 581 (MH + ) Example 168 Preparation of 4-[[N s -(4-pyridinylmethoxycarbonyl)-L-leucinyllaminomethyll-l -[(2S)-4- methyl-2-ff(benzyloxycarbonyl)laminolpentyll-3-pyrrolidinone a.) \-tert -butoxycarbonyl-rr «.v-3-aminomethyl-4-hydroxypyrrolidine A solution of the compound of Example 1 (b) (2.3 g, 12.4 mmol) in methylamine ( 10 L) was stirred at room temperature for 48 h whereupon it was concentrated, diluted with ethyl acetate and washed saturated NaHCU , water and brine. The organic layer was dried (MgS0 4 ), filtered and concentrated. Column chromatography of the residue (20% CH3θH:ethyl acetate) gave 424 mg of the title compound: MS(ES) 1 16 (MH+-Boc). b.) (3RS,4RS)-4-[[N -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminomethyl]- 1 -tert- butoxycarbonyl-3-pyrrolidinol To a solution of the compound of Example 170(a) (420 mg, 1.94 mmol) in CH2CI2 (20 L) was added N-(4-pyridylmethoxycarbonyl)-L-leucine (545 mg, 2.04 mmol), HOBT (276 mg, 2.04 mmol) and EDC (446 mg, 2.33 mmol). The reaction was allowed to stir at room temperature overnight whereupon it was diluted with CH2CI2 and washed 0.5N HCI, sat'd NaHCθ , water and brine. The organic layer was dried (MgS0 4 ), filtered and concentrated. Column chromatography of the residue (5:95 MeOH:CH2θ2) gave 600 mg of the title compound: MS(ES+) 465 (MH+). c.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminomethyl]-3- pyrrolidinol bis-hydrochloride To a solution of the compound of Example 170(b) (600 mg, 1.3 mmol) in methanol (10 mL) was added 4M HCI in dioxane ( 10 mL). The reaction was stirred at room overnight whereupon it was concentrated to give 608 mg of the title compound: MS(ES+) 365 (MH+). d.) (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminomethyl]- 1 -[(2S)-4- methyI-2-[[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol To a solution of the compound of Example 170(c) (325 mg, 0.74 mmol) in CH2CI2 ( 10 mL) was added TEA (0.21 mL, 1.49 mmol) followed by CBZ-leucinal (405 mg, 1.63 mmol). The reaction was allowed to stir at room temperature for 0.5 h whereupon sodium triacetoxyborohydride (392 mg, 1.85 mmol) was added. The reaction was stirred at room temperature for 2 h whereupon it was diluted with ethyl acetate and washed with sat'd NaHCθ3, brine, dried (Na2S0 4 ) , filtered and concentrated. Column chromatography of the the residue (5:95 methanol: CH2CI2) gave 120 mg of the title compound: MS(ES+) 598 (MH+). e.) 4-[[N 0l -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminomethyl]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 170(d), the title compound was produced: MS(ES+) 596 (MH + ). Example 169 Preparation of 1 -benzyl-4-[[N a -(2-nitro-α-toluencsulphonyl)-L-leucinyl1aminol-3- pyrrolidinone a.) (3RS,4RS)- 1 -benzy l-4-[[N α -(2-nitro-α-toluenesulphonyl)-L-leucinyI]amino]-3- pyrrolidinol To a solution of the compound of Example 1 10(b) (500 mg, 1.32 mmol) in CH2CI2 (20 mL) was added TEA (0.64 mL, 4.62 mmol) followed by 2-nitro-α-toluenesulfonyl chloride (327 mg, 1.38 mmol). The reaction was stirred until complete by TLC analysis. Workup and column chromatography (10% CH3OH/CH2CI2) gave 100 mg of the title compound: MS(ES+) 505 (MH+). b.) l-benzyl-4-[[N -(2-nitro-α-toluenesulphonyl)-L-leucinyl]amino]-3-pyrrolidinone Following the procedure of Example 46(k) except substituting the compound of Example 171 (a), the title compound was produced: MS (ES) 503 (MH + ). Example 170 Preparation of 1 -benzyl-4-HN g -(phenylsulphony l)-L-leucin yllaminol-3-pyrrolidinone a.) (3RS,4RS)-l-benzyl-4-[[N α -(phenylsulphonyl)-L-leucinylJamino]-3-pyrrolidinol Following the procedure of Example 169(a) except substituting benzenesulfonyl chloride for 2-nιtro-α-toluenesulfonyl chloride, the title compound was prepared MS(ES+) 446 (MH + ) b ) l-benzyl-4-[[N α -(phenylsulphonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 172(a), the title compound was produced MS(ES+) 444 (MH + ) Example 171 Preparation of l-benzyl-4-f[N g -(α-toluenesulphonyl)-L-leucιnyl]amιnol-3-pyrrohdιnone a ) (3RS,4RS)- 1 -benzyl-4-[[N"-(α-toluenesulphony l)-L-leucιny l]amιno]-3-pyrrohdιnol Following the procedure of Example 169(a) except substituting α-toluenesulfonyl chloride for 2-nιtro-α-toluenesulfonyl chloride, the title compound was prepared MS(ES+) 460 (MH + ) b ) l-benzyl-4-[[N α -(α-toluenesulphonyl)-L-leucιnyI]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 173(a), the title compound was produced MS(ES+) 458 (MH+) Example 172 Preparation of 1-benzyl-4-f[N a -(2-naphthylsulphonyl)-L-leucinyllaminol-3-pyrrohdinone a ) (3RS,4RS)- l -benzyl-4-[[N α -(2-naphthyIsulphonyl)-L-leucιnyllamιno]-3-pyrrohdιnoI Following the procedure of Example 169(a) except substituting 2- naphthalenesulfonyl chloride for 2-nιtro-α-toluenesulfonyl chloride, the title compound was produced MS(ES+) 496 (MH+) b ) 1 -benzy l-4-[[N α -(2-naphthylsulphonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone Following the procedure of Example 46(k) except substituting the compound of Example 174(a), the title compound was produced MS(ES+) 494 (MH + ) Example 173 Preparation of 1 -benzy 1-4-1 [N°-(2-naphthylcarbonyl)-L-leucιnyllamιnol-3-pιpendιnone a ) (3RS,4RS)-l -benzyl-4-[[N α -(L-leucιnyl)amιno]-3-pιpeπdιnol hydrochloride Following the procedure of Example 98(h-ι) except substituting benzaldehyde for CBZ-leucinal, the title compound was prepared MS(ES+) 320 3 (MH+) b ) (3RS,4RS)-l-benzyI-4-[[N ra -(2-naphthylcarbonyl)-L-leucιnyl]amιno]-3-pιperιdιnol Following the procedure of Example 98(j) except substituting the 2-naphthoιc acid for phenylacetic acid, the title compound was produced MS(ES+) 474 1 (MH + ) c ) 1 -ben7yl-4-[[N α -(2-naphthylcarbony l)-L-leucιnyl |amιno]-3-pιperιdιnonc Following the procedure of Example 98(k) except substituting the compound of Example 176(c), the title compound was produced MS(ES+) 472 3 (MH + ) Example 174 Preparation of I -benzy l-4-[fN α -(2-quιnohnylcarbon yl)-L-leucιny 1 lamino 1-3-pιpeπdιnone a ) (3RS,4RS)- 1-benzyl-4-[[N α -(2-quιnolιnylcarbonyl)-L-leucιnyl[amιno]-3-pιpeπdιnol Following the procedure of Example 173(b) except substituting quinaldic acid for 2-naphthoιc acid , the title compound was produced MS(ES+) 475 3 (MH + ) b ) l-benzyl-4-[[N α -(2-quιnohnylcarbonyl)-L-leucιnyl]amιno]-3-pιpeπdιnone Following the procedure of Example 98(k) except substituting the compound of Example 177(a), the title compound was produced MS(ES+) 473 3 (MH + ) Example 175 Preparation of l-benzyl-4-|[N α -(2-naphthylsulphonyl)-L-leucιnyllamιnol-3-pιperιdιnone a ) (3RS,4RS)-l-benzyl-4-[[N α -(2-naphthylsulphonyl)-L-leucιnyl]amιno]-3-pιpeπdιnol Following the procedure of Example 172(a) except substituting the compound of Example 173(a), the title compound was produced MS(ES+) 510 3 (MH+) b ) l-benzyl-4-[[N α -(2-naphthylsulphonyl)-L-leucιnyI]amιno]-3-pιpeπdιnone Following the procedure of Example 98(k) except substituting the compound of Example 178(a), the title compound was produced 508 MS(ES+) (MH 4 ) Example 176 Preparation of 4-irN g -(benzyloxycarbonyl)-L-leucιnyllamιnomethyll-l -l(2S)-4-methyl-2- [f (benzy loxycarbonyl)lamιnomethyl]pentanoyl]-3-pyrrohdιnone a ) (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyi]amιnomethyl J- 1 -[(2S)-4-methyl-2 [[(benzy loxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrolιdιnol Following the procedure of Example 1(e-g) except substituting N-methyl-CBZ-leucine for CBZ-leucme in steps 1 (e) and 1(g), the title compound was produced MS(ES+) 625 3 (M+H), 647 3 (M+Na) b ) 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιnomethyl]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnone Following the procedure of Example 3(b) except substituting the compound of Example 176(a), the title compound was produced MS(ES+) 623 4 (M+H), 645 4 (M+Na) Examples 177-198 The following compounds were prepared using processes analogous to those detailed in Examples 1-176 Example Name 177 (3RS,4RS)-4-[(2S)-4-methyl-2-[(benzyloxycarbonyl)amιno]pentyl]- l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentanoyl]- 3-pyrrohdmone 4-[(2S)-4-methyl-2-[(benzyloxycarbony l)amιno]pentyl]- 1 - [(2S)-4-methyl-2-[ [(benzy loxycarbonyl)]amιno]pentanoyl]- 3-pyrrohdιnone 178 (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno] [2-[(α-toluenesulphonyl)amιnolethyl]-3-pyrrohdιnol 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- l- [2-[(α-toluenesulphonyl)amιno]ethyl]-3-pyrrohdιnone 179 (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- 1 -benzoyl-3- pyrrohdinol 4-[[N -(4-fluorobenzoyl)-L-leucιnyl]amιno]- l-benzoyl-3-pyrrohdιnone 180 (3RS,4RS)-4-[[N α -(piperonylcarbonyl)-L-leucιnyI]amιno]-l-benzoyl-3- pyrrolidinol 4-[[N α -(pιperonylcarbonyl)-L-leucιnyl]amιno]-l -benzoyl-3- pyrrolidinone 181 (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- [2-[(4-fluorobenzoyl)amιno]ethyl]-3-pyrrohdιnol 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- 1 - [2-[(4-fluorobenzoyl)amιno|ethyl]-3-pyrrohdιnone 182 (3RS,4RS)-4-[[N α -(?grr-butoxycarbonyl)-L-leucιnyl]amιno]- 1 -benzoyl- 3-pyrrohdιnol 4-[[N -(/g/7-butoxycarbonyl)-L-leucιnyl]amιno]- 1 -benzoyl-3- pyrrohd one 183 (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- l -[(2S)-4- methyl-2-[(4-fluorobenzoyl)amιno]pentyl]-3-pyrrohdιnol 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- l-[(2S)-4- methyl-2-[(4-fluorobenzoyl)amιno]pentyI]-3-pyrrohdιnone 184 4-[[N α -(4-carboxybenzoyl)-L-leucιnyl]amιno]- 1 -[(2S)-4- methyl-2-[(4-fluorobenzoyI)amιno]pentyl]-3-pyrrohdιnone lithium salt 185 1 -benzyl-4-[[N α -(4-carboxybenzoyl)-L-leucιnyl]amιno]-3- pyrrohdinone lithium salt 186 (3RS,4RS)- 1 -benzy l-4-[[N α -(4-carboxymethyl)benzoyl)- L-leucιnyl]ammo]-3-pyrrohdιnol 1 -benzy l-4-[[N α -(4-carboxymethyl)benzoyl)-L-leucιnyl]amιno]-3- pyrrohdmone 187 (3RS,4RS)-4-[[N α -[(4-carboxymethyl)benzoyl]-L-leucιnyl]amιnoJ- [(2S)-4-methyl-2-[[(4-fluorobenzoyl)amιno]pentyl]-3-pyrrohdιnol 4-[[N α -[(4-carboxymethyl)benzoyl]-L-leucιnyl]amιno]- l-[(2S)-4- methyl-2-[[(4-fluorobenzoyl)amιno]pentyl]-3-pyrrohdιnonc 188 (3RS,4RS)- l-phenethyl-4-[[N α -(2-amιno-α-toluenesulphonyl)-L-leucιnyl], 3-pyrrohdιnol l-phenethyl-4-[[N α -(2-amιno-α-toluenesulphonyl)-L-leucιnyl]amιno]-3- pyrrohdinone 189 (3RS,4RS)-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιno|- l -benzoyl- 3-pιpeπdιnol 4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl Jamino]- 1 -benzoyl-3- pipeπdinone 190 (3RS,4RS)-4-[[N α -(2-qumohnecarbonyl)-L-leucιnyl]amιno] l -benzoyl- 3-pιpeπdιnol 4-[[N α -(2-quιnohnecarbonyl)-L-leucιnyl]amιno]-l-ben7oyl-3- pipeπdinone 191 (3RS,4RS)-4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno]-l- benzoyl-3-pιpeπdιnol 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl jamino]- 1 -benzoyl-3- pipeπdinone 192 (3RS,4RS)-4-[[(2S)-4-methyl-2-(benzyl)oxy ]pentanoy 1]- 1 - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]ammo]pentanoyl]- 3-pιpeπdιnol 4-|[(2S)-4-methyl-2-(benzyl)oxy]pentanoyl]-l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amino]ρentanoyl]- 3-piperidinone 193 (3RS,4RS)-4-[[3-(2-pyridyl)phenylacetyI)]amino]- l -[3-(2-pyridyl)phenyla piperidinol 4-[[3-(2-pyridyl)phenylacetyl)]amino]-l-[3-(2-pyridyl)phenylacetyl)]-3-pi| 194 (3RS,4RS)-4-[[N α -(p-trifluoromethanephenylsulphonyl)- L-leucinyl]amino]- l-[3-(2-pyridyl)phenylacetyl)]-3-piperidinol 4-[[N α -(p-trifluoromethanephenylsulphonyI)- L-IeucinyI]amino]-l-[3-(2-pyridyl)phenylacetyl)]-3-piperidinone 195 (3RS,4RS)-4-[[N α -(2-naphthylsulphonyl)- L-leucinyl]amino]- l-[3-(2-pyridyl)phenylacetyl)]-3-piperidinol 4-[[N α -(2-naphthylsulphonyl)- L-leucinyl]amino]-l-[3-(2-pyridyl)phenylacetyl)]-3-piperidinone 196 (3RS,4RS)-4-[[N α -(3,4-dichlorophenylsulphonyl)- L-leucinyl]amino]-l-[3-(2-pyridyl)phenylacetyl)]-3-piperidinol 4-[[N α -(3,4-dichlorophenylsulphonyI)- L-leucinyl]amino]- l-[3-(2-pyridyl)phenylacetyl)]-3-piperidinone 197 (3RS,4RS)-4-[[N α -(methanesulphonyl)- L-leucιnyl]amιno]- l-[3-(2-pyridyl)phenylacetyl)]-3-pιperιdιnol 4-[[N α -(methanesulphonyl)- L-leucιnyl]amιno]- l-[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnone 198 (3RS,4RS)-4-[[N -(4-fluorophenylsulphonyl)- L-leucιnyl]amιno]- l-[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnol 4-[[N α -(4-fluorophenylsulphonyl)- L-leucιnyl]amιnol- l-[3-(2-pyπdyl)phenylacetyI)]-3-pιpeπdιnone The above specification and Examples fully disclose how to make and use the compounds of the present invention However, the present invention is not limited to the particular embodiments described hereinabove, but includes all modifications thereof within the scope of the following claims The various references to journals, patents and other publications which arc cited herein comprise the state of the art and are incorporated herein by reference as though fully set forth

Claims: What is claimed is: A compound according to formula (I): wherein: A is C(O) or CH(OH); R 1 is R 2 is H, Cι _ 6 alkyi, C 3 ..6cycloalkyl-Cθ-6alkyl, Ar-Cθ-6 lkyl, Het-C 0 _6alkyl, R 5 C(0)-, R 5 C(S)-, R 5 S0 2 -, R 5 OC(0)-, R 5 R'NC(0)-, R 5 R'NC(S)-, adamantyl-C(O)-, or R" is H, Ci .galkyl, Ar-Co-όalkyl, or Het-CQ-όalkyl; R'" is H, Cj.galkyl, C3_ 6 cycloalkyl-C 0 -6alkyl, Ar-C 0 _6alkyl, or Het-C 0 _6alkyl; each R3 independently is H, C2-6alkenyl, C2-6alkynyl, Het, Ar or Cj -όalkyl optionally substituted by OR', SR', NR' 2 , R'NC(0)OR 5 , C0 2 R', C0 2 NR' 2 , N(C=NH)NH , Het or Ar; R 4 is H, C |_ 6 alkyl, C 3 _6cycloalkyl-Co-6alkyl, Ar-C 0- 6alkyI, Het-C 0- 6alkyl, R 5 C(0)-, R 5 C(S)-, R 5 S0 2 -, R 5 OC(0)-, R 5 R'NC(0)-, R5R'NC(S)-, R'HNCH(R')C(0)-, or R 5 OC(0)NR'CH(R')C(0)-, each R * independently is C3_ ycloalkyl-Co-6 a lkyl, Ar-Co- a 'kyl, Het-Co_6 a lkyl, Ar-Co-6 a 'koxy, Het-Co_6 a 'koxy, or Ci-^alkyl optionally substituted by OR', SR', NR'2, R'NC(0)OR 5 , C0 2 R', C0 2 NR' 2 , N(C=NH)NH 2 , Het or Ar, R 6 is H, Ci . alkyl, Ar-Cθ-6 a Ikyl, or Het-C - l yl and R 7 is H, C]. 6 alkyl, C3. 6 cycloalkyl-C 0 -6alkyl, Ar-C 0- 6alkyl, Het-C 0- 6alkyl, R 5 C(0)-, R 5 C(S)-, R 5 S0 -, R 5 OC(0)-, R 5 R'NC(0)-, R 5 R'NC(S)-, R'HNCH(R')C(0)-, or R 5 OC(0)NR'CH(R')C(0)-, or Ro and R 7 are connected to form a pyrrolidine, a piperidine, or a morphohne ring, each R' independently is H, C i .galkyl, Ar-Cθ-6alkyl, or Het-Co-6 a lkyl, R* is H, C ι _ 6 alkyl, C3_ cycloalkyl-Co-6 a lkyl, Ar-C 0- 6alkyl, or Het-Co-6alkyl, Y is a single bond or O; each Z independently is CO or CH2; and n is 0, 1 , or 2, or a pharmaceutically acceptable salt thereof 2. A compound according to claim 1 wherein R ' is 3 A compound according to claim 2 wherein R 4 is R^C(O)-, R^Sθ2-, R 5 OC(0)-. 4. A compound according to claim 3 wherein R^ m said R ' group is Ar-Co- a l yl or Het-Cθ-6 a lkyl- 5 A compound according to claim 4 wherein R-* in said R ' group is phenyl or benzyl which are unsubstituted or substituted by one or two of the group consisting of Cl, Br, F, CF 3 , C j _ 4 alkyl, OH, C 1 _ 4 alkoxy, CN, CONH 2 , NH 2 , or N0 2 , or substituted by methylenedioxy; or 6. A compound according to claim 2 wherein, in said R^ group, R' is H or CH3 and R 3 is i-butyl. 7. A compound according to claim 1 wherein R ' is 8. A compound according to claim 1 wherein R 2 is R° R 3 9 A compound according to claim 8 wherein R 7 is R^OC(O)- 10 A compound according to claim 9 wherein R^ in said R 7 group is Ar-Co_ alkyl or Het-Co_6alkyl 1 1 A compound according to claim 10 wherein R~* in said R ' group is phenyl or benzyl which are unsubstituted or substituted by one or two of the group consisting of Cl, Br, F, CF 3 , C | . 4 alkyl, OH, C | . 4 dlkoxy, CN, CONH 2 , NH 2 , or N0 2 , or substituted by methylenedioxy, or 2-, 3-, or 4-pyπdyl-CH2- 12 A compound according to claim 1 wherein R 2 is X ' in which X is CO, S0 2 , or CH 2 -CO and Y is a single bond or O 13 A compound according to claim 8 wherein, in said R 2 group, R° is H or CH3 and R 3 is i-butyl 14 A compound according to claim 1 wherein R 2 is Ar-Co-6 a 'kyl, Het-Co_6alkyl,C3_ 6 cycloalkyl-C 0 -6alkyl, Ar-C 0 .6alkyl, Het-C 0 -6 a lkyl, R 5 C(0)-, R 5 C(S)- R 5 S0 2 -, R 5 OC(0)-, R 5 R'NC(0)-, R 5 R'NC(S)-, R'HNCH(R')C(0)-, R 5 OC(0)NR'CH(R')C(0)-, adamantyl-C(O)- 15 A compound according to claim 1 wherein A is C(O) 16 A compound according to claim 1 which is (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]ammo]pentanoyI]-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[4-(phenoxybenzamιde)]-3- pyrrohdinone, (3RS,4RS)-4-[[N a -(ben?yloxycarbonyl)-L-leucinyl Jamino]- 1 -[4- (bιphcnylethanoy!)]-3-pyrrohdιnol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[4-(bιphenylethanoyl)]-3- pyrrohdinone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl Jamino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrolιdιnone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucmyl]amιnoJ-l -[(2S)-4-methyl-2- [[(tert-butoxyoxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyI-2-[[(tert- butoxyoxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnonone, 4-[[N α -(benzyloxycarbony l)-L-leucιnyl]amιno]- 1 -[(2S)-4-methy 1-2- (amιnomethyl)pentanoylJ-3-pyrrohdιnone, 4-[[N -(benzyloxycarbonyI)-L-leucιnylJamιno]- l -tert-butoxycarbonyl-3- pyrrohdinone, 4-[[N α -(benzyIoxycarbonyl)-L-leucιnylJamιno]-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2-[[(N-tert- butoxycarbonyl)ethanoyl]amιnomethyl]pentanoyl]-3-pyrrohdιnone, 4-[[N α -(benzy loxycarbonyl)-L-leucιnyl Jamino]- l -[(2S)-4-methy 1-2- [(ethanoyl)amιnomethyl]pentanoyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -f(2S)-4-methyl-2- [[(tert-butoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2-[[(tert- butoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N a -(benzyloxycarbony)-L-leucιnyl]amιno]- l-[(2R)-4-methyl-2- [[(ben7yloxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnol, 4-[[N α -(benzyloxycarbony)-L-leucιnyl)amιno]-l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[2- [(benzyloxycarbonyl)amιno]ethanoyl]-3-pyrrohdιnonol, 4-[[[N -(benzyloxycarbonyl)-L-leucιnyI]amιno]-l-[2- [(benzyloxycarbonyl)amιno]ethanoyl]-3-pyrrohdιnonone, (3RS,4RS)-4-[[N α -(benzyloxycarbony)-L-leucιnyl]amιno]- l-[(2S)-3-tert-butoxy- [[(benzyloxycarbonyl)]amιno]propanoyl]-3-ρyrrohdιnol, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l -[(2S)-2- [f(benzyloxycarbonyl)]amino]propanoylJ-3-pyrrolidinol; 4-[[N α -(benzyloxycarbony)-L-leucinyl]amino]- 1 -[(2S)-2- [[(benzyloxycarbonyl)]amino]propanoyl)-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l - [cyclohexanepropanoyl]-3-pyrrolidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl Jamino]- 1 -[cyclohexanepropanoyl]-3- pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(4-pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-pyrrolidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l -[(2S)-4-methyl-2-[[(4- pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-1 -[(2S)-4-methyl-2- [[(2-pyridinylmethoxycarbonyl)[aminoJpentanoyl]-3-pyrrolidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l -[(2S)-4-methyl-2-f[(2- pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N"-(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(3-pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-pyrrolidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2-[ |(3- pyridinylmethoxycarbonyl)]amino]pentanoyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino|- l -(2-pyridylcarbonyl)- 3-pyrrolidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l-(2-pyridylcarbonyl)-3- pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]aminoJ- 1 -| (2S)-4-methy 1-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -[4- (biphenyl)ethanoylj- 3-piperidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-[4-(biphenyl)ethanoyl]-3- piperidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-piperidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-piperidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-tert-butoxycarbonyI-3- pipeπdinone, (3RS,4RS)-4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-[2- [[(ben7yloxycarbonyl)]ιso-butyIamιno]ethanoyI]-3-pιpendιnol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 -[2-[[(benzyloxycarbonyI)]ιso- butylamιno]ethanoyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[2-[(tert- butoxycarbonyl)amιno]ethanoyl]-3-pιpeπdιnol, 4-[[N α -(benzyloxycarbony l)-L-leucmy l]amιno]- 1 -[2-[(tert- butoxycarbonyl)amιno]ethanoyl]-3-pιpeπdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[2-(amιno)ethanoyl]-3- pipeπdinone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -(4-methyIpentanoyl)- 3-pιpeπdιnol, 4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -(4-methylpentanoyl)-3- pipeπdinone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyI)-L-leucιnyl]amιno]- l -(benzoyl)-3- pipeπdinol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-(benzoyl)-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 -(acetyl)-3- pipeπdinol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-(acetyl)-3-pιperιdιnone, (3RS,4RS)-4-[[N a -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -(2-pyπdoxyacetyl)-3- pipeπdinol, 4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 -(2-pyndoxyacety l)-3- pipeπdinone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyI)-L-leucιnyl]amιnoJ- 1 -[2- [(benzyloxycarbonyl)methylamιno]ethanoyl]-3-pιpeπdιnol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[2- [(benzyIoxycarbonyl)methylamιno]ethanoyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(benzyloxycarbony)-L-leucιnyl]amιno]- 1 - [3-(2-pyπdyl)phenylacetyl)]-3-pιpendιnol; 4-[[N α -(benzyloxycarbony)-L-leucmyl]amιno]-l-[3-(2-pyrιdyl)phenylacetyl)]-3- pipeπdinone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 -[2- [(benzyloxycarbonyl)methylamino]ethanoyl]-3-pyrrohdinol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[2- [(benzyloxycarbonyl)methylamιno]ethanoyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[2- (phenoxy)ethanoyl]-3-pyrrohdιnol, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl|amιno]- l -[2-(phenoxy)ethanoyl]-3- pyrrohdinone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-l- [(2-phenyl)ethanoyl]-3-pyrrohdιnol, 4-[[[N -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιnoJ-l-[(2-phenyl)ethanoylJ- 3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbony)-L-leucιnyl]amιno]- l -ethanoyl-3- pyrrohdinol, 4-[[N α -(4-pyπdιnylmethoxycarbony)-L-leucιnyl]amιnoJ- l-ethanoyl-3- pyrrohdinone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbony])-L-leucιnyl)amιno]-l - (4-cyanobenzoyl)-3-pyrrohdιnol, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιnol-l -(4-cyanobenzoyl)-3- pyrrohdinone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l - tert-butoxycarbonyl-3-pyrrolιdmol, 4-[[N α -(4-pyrιdιnylmethoxycarbonyl)-L-leucιnyl]amιnoJ- l-tert-butoxycarbonyl-3- pyrrohdinone, (3RS,4RS)-4-[[N α -3-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l- tert-butoxycarbony 1-3-py rrol ldinol , 4-[[N α -(3-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno)- l-tert-butoxycarbonyl-3- pyrrohdinone, 4-[[N -(3-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιnoJ-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(2-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιnoJ- l-[(2S)-4- methyl-2-[[(benzyloxycarbonyl)]amιnomethyl]pentano lJ-3-pyrrohdιnone, 4-[[N α ιdmylmethoxycarbony l)-L-leucιnyl Jamino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnone; (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4- methyl-2-[[(4-pyrιdιnylmethoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnol; 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-1 -[(2S)-4-methyl-2-[[(4- pyπdιnylmethoxycarbonyl)Jamιno]pentanoyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N -(4-pyrιdιnylmethoxycarbonyl)-L-leucιnylJamιno]- l-[(2S)-4- methyl-2-[[(benzyloxycarbonyl)Jamιnomethyl]pentanoyl]-3-pyrrohdιnol, 4-[[N α -(4-pyπdιny lmethoxycarbonyl)-L-leucιπyl Jamino]- l -[(2S)-4-methy 1-2- [[(benzyloxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιnoJ- 1 -|(2S)-4-methyl- 2-[[(benzyloxycarbonyl)Jamιno]pentyl]-3-pyrrohdιnol, 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [f(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N a -(4-pyndinylmethoxycarbonyl)-L-leucinyl Jamino]- 1 - [ l -(adamantyl)carbonyl]-3-pyrrohdιnol, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-Ieucιnyl Jamino]- 1 -[ 1 - (adamantyl)carbonyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(benzyloxycarbony l)-L-leucιny I Jamino]- l-(4-methyl- pentanoyI)-3-pyrrolιdιnol, 4-f [N α -(benzyloxycarbonyl)-L-ieucιnylJamιno]- l -(4-methyl-pentanoyl)-3- pyrrohdmone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-D-leucιnyl]amιno]-l -[(2S)-4-methyl-2- [[(benzyloxycarbony])]amιno]pentanoyl]-3-pιpeπdιnol, 4-[[N α -(benzyloxycarbonyl)-D-leucιnyl Jamino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N tI -(tert-butoxycarbonyl)-L-leucιnylJamιnoJ-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)Jamιno]pentanoyl]-3-pιpeπdιnol, 4-[[N α -(tert-butoxycarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιnoJpentanoyl]-3-pιpeπdιnone (3RS,4RS)-4-[[N"-(benzyloxycarbonyl)-N c -(tert-butoxycarbonyl)-L-lysιne]amιno]- I- l(2S)-4-methyI-2-[[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιpeπdιnol, 4-[[N α -(benzyloxycarbonyl)-N e -(tert-butoxycarbonyl)-L-lysιne]amιno]-l- [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l - tert-butoxycarbony I-3-pιpeπdιnol , 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-Ieucιnyl]amιno]-l -tert-butoxycarbony 1-3- pipeπdinone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- 1 - (4- methylpentanoyl)-3-pιpeπdιnol, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- 1 -(4-methylpentanoyl)-3- pipeπdinone, (3RS,4RS)-4-[[N -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-[2- (benzyloxycarbonyl)]iso-butylaminoJethanoyl]-3-piperidinol; 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l -[2- (benzyloxycarbonyl)Jiso-butylamino]ethanoylJ-3-piperidinone; (3RS,4RS)-4-[[N-2-(benzyloxycarbonyl)]iso-butylamino]ethanoyl]- l- [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]aminoJpentanoyl]-3-piperidinol; 4-[[N-2-(benzyloxycarbonyl)]iso-butylamino]ethanoyl]- l -[(2S)-4-methyl-2- [f(benzyloxycarbonyl)Jamino]pentanoyl]-3-piperidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l -(methanesulphonyl)- 3-piperidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l -(methanesulphonyl)-3- piperidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-(phenylsulphonyl)-3- piperidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -(phenylsulphonyl)-3- piperidinone; (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-(8- quinolinesulphonyl)-3-pyrrolidinol; 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l -(8-quinoIinesulphonyl)- 3-pyrrolidinone; (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-1 - (2-pyridylsulphonyl)-3-pyrrolidinone; 4-[|N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminoJ- l-(2-pyridy Isulphony l)-3- pyrrolidinone; (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinylJaminoJ- 1 - [(2-propoxy)carbonyl]-3-pyrrolidinol; 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinylJamino]-1- [(2-propoxy)carbonyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]- l-[(3-methy- l-propoxy)carbonyl]-3-pyrrolidinol; 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyI Jamino]- 1 -[(3-methyl- 1 - propoxy)carbonyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- 1 - [(4-phenoxy)phenylsulphonyl]-3-pyrrolidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(4-phenoxy)phenylsulphonyl]-3- pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino|- 1 - f(4-phenoxy)pheny Isulphony l]-3-piperidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]- l- [(4-phenoxy)phenylsulphonyl]-3-piperidinone; (3RS,4RS)-4-[[N α -(3,4-dichlorobenzoyl)-L-leucinyl]amino]-1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol; 4-[[N α -(3,4-dichlorobenzoyl)-L-leucinyl]amino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(6-quinolinecarbonyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminoJpentylJ-3-pyrrolidinol; 4-[[N α -(6-quinolinecarbonyI)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyI]-3-pyrrolidinone; (3RS,4RS)-4-[(2-dibenzofuransulphonyl)aminoJ- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)JaminoJpentanoyl]-3-pyrrolidinol; 4-[(2-dibenzofuransulphonyl)amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminoJpentanoyl]-3-pyrrolidinone; (3RS,4RS)-4-[(2-dibenzofuransulphonyl)amino]- l-[(2S)-4-methyl-2- [[(benzyioxycarbonyl)]methylamino]pentanoyl]-3-pyrrolidinol; 4-[(2-dibenzofuransulphonyl)amino]-l-[(2S)-4-methyl-2- [ [(benzy loxycarbonyl)]methylamino]pentanoyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -(4-methylpentyI)-3- piperidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-(4-methylpentyl)-3-piperidinone; (3RS,4RS)-4-[[N α -(2-pyridylcarbonyl)-L-leucinyl]amino]-l-(4-methylpentyl)-3- piperidinol; 4-[[N α -(2-pyridylcarbonyl)-L-leucinyl]aminoJ- 1 -(4-methylpentyl)-3-piperidinone; (3RS,4RS)-4-[[N α -(3-chlorobenzoyl)-L-leucinyl]amino]- l-(4-methylpentyl)-3- piperidinol; 4-[[N α -(3-chlorobenzoyl)-L-leucinyl]amino]-l-(4-methylpentyl)-3-piperidinone; (3RS,4RS)-4-[[N α -(2-quinolinecarbonyl)-L-leucinyl]amino]-l -(4-methy lpentyl)-3- piperidinol; 4-[[N -(2-quinolinecarbonyl)-L-leucinyl]amino]- l-(4-methylpentyl)-3- piperidinone; (3RS,4RS)-4-[[N α -(3,4-dichlorobenzoyl)-L-Ieucinyl]amino]- l-(4-methylpentyl)-3- piperidinol; 4-[[N α -(3,4-dichlorobenzoyl)-L-leucinyl]amino]- 1 -(4-methylpentyl)-3- piperidinone; (3RS,4RS)-4-[[N α -(8-quιnolιnecarconyl)-L-leucιnyl]aιτuno]- l-(4-methylpentyl)-3- pipeπdinol, 4-[[N α -(8-quιnohnecarbonyl)-L-leucιnyl]amιno]- l -(4-methy lpentyl)-3-pιpeπdιnonc (3RS,4RS)-4-[[N α -(3-ιsoquιnohnecarbonyl)-l -leucιnyl]amιno]- l -(4-methylpentyl)- 3-pιpeπdιnol, 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno]-l -(4-methylpentyl)-3- pipeπdinone, (3RS,4RS)-4-[[N α -(2-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιnoJ-l - (4-methylpentyl)-3-pιpeπdιnol, 4-[[N α -(2-pyrιdιnylmethoxycarbonyl)-L-leucιnyl Jamino]- 1 -(4-methy Ipenty l)-3- pipeπdinone, (3RS,4RS)-4-[[N α -(acetyl)-L-leucιnyl]amιno]- l -(4-methylpentyl)-3-pιpeπdιnol, 4-[[N α -(acetyl)-L-leucιnyl Jamino]- 1 -(4-methy lpentyl)-3-pιpeπdιnone, (3RS,4RS)-4-[(N α -(p-trιfluoromethylbenzenesulphonyl)-L-leucιnylJamιno]- l-(4- methylpentyl)-3-pιpeπdιnol, 4-[[N α -(p-tπfluoromethylben7enesulphonyl)-L-leucιnyl]amιnoJ- l-(4- methylpentyl)-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(6-quιnohnecarbonyl)-L-leucιn l]amιnoJ- 1 -(4-methylpentyl) 3- pipeπdinol, 4-[[N α -(6-quιnohnecarbonyl)-L-leucιny I Jamino J- 1 -(4-mcthy Ipenty l)-3- pipeπdmone, (3RS,4RS)-4-[[2-(RS)-(3-bιphenyl)-4-methylJamιno]pentanoyI]-l -(4- methylpentyl)-3-pιpeπdιnol, 4-[[2-(RS)-[(3-bιphenyl)-4-methyl]amιno]pentanoyIJ- l -(4-methy Ipenty l)-3 pipeπdinone, (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[2- [(benzyloxycarbonyl)methylamιno]ethyI]-3-pιpeπdιnol, 4-[[N -(benzyloxycarbonyl)-L-leucιnyl]amιno]- 1 - [2-[(benzyloxycarbonyl)methylamιno]ethyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(a-toluenesulphony l)-L-leucιnyl]amιno]- 1 - [3-(2-pyrιdyl)phenylacetyl)]-3-pιpeπdιnol, 4-[[N α -(a-toluenesulphonyI)-L-leucιnyl]amιno]- l-[3-(2-pyπdyl)phenylacetyl)]-3- piperidmone, (3RS,4RS)-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιno|-l- [3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnone, 4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιno]- l-[3-(2-pyπdyl)phenylacetyl)J-3- pipeπdinone, (3RS,4RS)-4-[[N α -(benzensulphonyl)-L-leucinyllamino]- 1 - [3-(2-pyridyl)phenylacetyl)]-3-piperidinol; 4-[[N α -(benzensulphonyl)-L-leucinyI]amino]-l-[3-(2-pyridyl)phenylacetyl)]-3- piperidinone; (3RS,4RS)-4-[[N α -(3-isoquinolinecarbonyl)-L-leuciny IJaminoJ- 1 - [3-(2-pyridyl)phenylacetyl)J-3-piperidinoI; 4-[[N α -(3-isoquinolinecarbonyl)-L-leucinyl]amino]- l -[3-(2-pyridyl)phenylacetyl)]- 3-piperidinone; (3RS,4RS)-4-[3-[(2-pyridyl)phenylacetyl)]amino]- l-[(2S)-4-methyl-2- [[(benzyioxycarbonyl)]aminoJpentanoyl]-3-piperidinol; 4-[3-[(2-pyridy l)pheny lacety l)Jamino]- 1 -[(2S)-4-methy 1-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-piperidinone; (3RS,4RS)-4-[3-[(2-pyridyl)phenylacetyl)]aminoJ- l -[(2S)-4-methyl-2-[[(2- pyridinylmethoxycarbonyl)]aminoJpentanoylJ-3-piperidinol; 4-[3-[(2-pyridyl)phenylacetyl)Jamino]-l-[(2S)-4-methyl-2-[[2- (pyridinylmethoxycarbonyl)]amino]pentanoy]]-3-piperidinone; (3RS,4RS)-4-[[N α -(2-phenylacetyl)-L-leucinylJamino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol; 4-[[N α -(2-phenylacety l)-L-leucinyl]amino]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyI)]amino]pentyl]-3-pyrrolidinone; 4-[[N α -(tert-butoxyoxycarbonyl)-L-Ieucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrroiidinone; 4-f(L-leucinyl)amino]-l -[(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amino]pentyl]-3- pyrrolidinone; (3RS,4RS)-4-[[N α -(2-quinolinecarbonyI)-L-leucinyl]amino]- 1 -[(2S)-4-methy 1-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol; 4-[[N α -(2-quinolinecarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyI]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(piperonylcarbonyl)-L-leucinyl]amino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol; 4-[[N α -(piperonylcarbonyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)Jamino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucinyI]amino]-1-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminoJpentyI]-3-pyrrolidinol; 4-[[N α -(4-fluorobenzoyI)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(2-pyπdylcarbonyl)-L-leucιnyI|amιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyI]-3-pyrrohdιnol, 4-HN α -(2-pyrιdylcarbonyl)-L-leucιnylJamιnol-l -[(2S)-4-methyl-2- J[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnonc, (3RS,4RS)-4-[[N α -(2-mtro-a-toluenesulphonyl)-L-leucιnyl]amιno]- l -[(2S)-4- methyl-2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol, 4-[[N α -(2-nιtro-a-toluenesulphonyl)-L-leucιnyl]amιnoJ- l -[(2S)-4-methyl-2- [|(ben7yloxycarbonyl)Jamιno]pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(8-quιnohnesulphonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentylJ-3-pyrrohdιnol, 4-[[N α -(8-quιnohnesulphonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrohdinone, (3RS,4RS)-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιnomethyl]- l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol, 4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιnomethyl]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]ammo]pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(2-quιnohnylcarbonyl)-L-leucιnyl]amιnomethyl]-l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrolιdιnol, 4-[[N α -(2-quιnohnylcarbonyl)-L-leucιnyl]amιnomethyl]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentylJ-3-pyrrohdιnone, (3RS,4RS)-4-[[N -(phenylacetyl)-L-leucιnyl[amιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol, 4-[[N α -(phenylacetyl)-L-leucιnyl]ammo]-l-[(2S)-4-methyl-2- [[(ben7yloxycarbonyl)]amιnojpentyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l -l(2S)-4- methyl-2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)Jamιno]pentyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιnoJ-l-[(2R)-4- methyl-2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l -[(2R)-4-methyl-2- [[(benzyloxycarbonyl)Jamιno]pentyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(ρhenylacetyl)-L-leucιnyl]amιno]- l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol, 4-[[N α -(phenylacetyl)-L-leucιnyl]amιno]- 1 -[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]amino]-l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnol, 4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]amιno]-l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιnolpenty]]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]amιnoJ- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbony])]amιno]pentylJ-3-pιpeπdιnol, 4-[[N tt -(4-ιmιdazoleacetyI)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2- f[(benzyloxycarbonyl)Jamιno]pentyl]-3-pιperιdιnone, (3RS,4RS)-4-[[N 0l -(4-pyπdιnylcarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- f[(benzyloxycarbonyl)]amιno]pentyl J-3-pιpeπdιnol, 4-[[N™-(4-pyridinylcarbonyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyI)]amιno]pentyl]-3-pιpeπdιnone, 4-[[N α -(tert-butoxycarbonyl)-L-leucιnyI]amιno]- l -(benzy loxycarbonyl)-3- pipeπdinone, (3RS,4RS)-4-[[N α -(8-quιnohnesulphonyl)-L-leucιnyl]amιnol- l - (benzyloxycarbonyl)-3-pιpeπdιnol, 4-[[N -(8-quιnohnesulphonyl)-L-leucιnyl]amιno]- l -(benzy loxycarbonyl)-3- pipeπdinone, (3RS,4RS)-4-[[N α -(4-pyπdιnylacetyl)-L-leucιnyl]amιno]-l -(ben7yloxycarbonyl)-3- pipeπdinol, 4-[[N α -(4-pyπdιnylacetyl)-L-leucιnyl]amιno]-l -(benzy loxycarbonyl)-3- pipeπdinone, (3RS,4RS)-4-[[N α -(4-ιmιda7θleacetyl)-L-leucιnyl]amιnoJ-l -(benzyloxycarbonyl)- 3-pιpeπdιnol, 4-[[N"-(4-ιmιdazoleacetyl)-L-leucιnyl]amιno]-l-(benzyloxycarbonyl)-3- pipeπdinone, (3RS,4RS)-4-[[N α -(4-pyπdιnylcarbony l)-L-leucιny l]amιno]- 1 - (benzyloxycarbonyl)-3-pιpendιnol, 4-[[N α -(4-pyπdιnylcarbonyl)-L-leucιnyl]amιno]- l-(benzyloxycarbonyl)-3- pipendinone, (3RS,4RS)-l-benzyl-4-[[N"-(3-ιsoquιnohnylcarbonyl)-L-leucιnyl]amιno]-3- pyrrohdinol, 1 -benzy l-4-[[N α -(3-ιsoquιnohnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, (3RS,4RS)-l -benzyl-4-[[N α -(3,4-dιchlorobenzoyl)-L-leucιnyl]amιno]-3- pyrrohdinoi, 1-benzyl-4-[[N α -(3,4-dιchlorobenzoyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, (3RS,4RS)-l-benzyl-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιnomethyl]-3- pyrrohdmol, l -ben7yl-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιnomethyl]-3-pyrrohdιnonc, (3RS,4RS)-l-benzyl-4-[[N α -(2-quιnohnylcarbonyl)-L-leucιnyl]dmιnomethyl]-3- pyrrohdinol, l-benzyl-4-[[N α -(2-quιnolιnylcarbonyl)-L-leucιnyl]amιnomethyl]-3-pyrrohdιnone, (3RS,4RS)-l-benzyl-4-[[N α -(2-quιnohnylcarbonyl)-L-leucιnyl]amιno]-3- pyrrohdinol, 1 -benzy l-4-[[N α -(2-quιnohnylcarbonyI)-L-leucιnyl]amιno]-3-pyrrohdιnone, (3RS,4RS)-1 -benzy l-4-[[N α -(pιperonylcarbonyl)-L-leucιnyl]amιnoJ-3-pyrrohdιnol, l-benzyl-4-[[N α -(pιperonylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, (3RS,4RS)- l-benzyl-4-[[N ot -(4-fluorobenzoyl)-L-leucιnyl]amιno]-3-pyrrohdιnol, l -benzyl-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιnoJ-3-pyrrohdιnone, (3RS,4RS)-l-benzyl-4-[[N α -(6-hydroxy-2-naphthylcarbonyl)-L-leucιnyl]amιnol- 3-pyrrohdιnol, l -benzyl-4-[[N α -(6-hydroxy-2-naphthylcarbonyl)-L-leucιnyl]amιnoJ-3- pyrrohdinone, (3RS,4RS)-1 -benzy l-4-[[N α -(2-naphthylcarbonyl) L-lcucιnyl]amιno]-3- pyrrohdinol, l -benzyl-4-[[N α -(2-naphthylcarbonyI)-L-leucιnyl]amιnoJ-3-pyrrohdιnone, (3RS,4RS)-l-benzyl-4-[[N α -(6-quιnohnylcarbonyl)-L-leucιnyl]amιno]-3- pyrrohdinol, l-benzyl-4-[[N α -(6-quιnohnylcarbonyl)-L-leucιnylJamιno]-3-pyrrohdmone, (3RS,4RS)-l-benzyl-4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]amιno]-3-pyrrohdιnol, 1 -benzy l-4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]amιnoJ-3-pyrrohdιnone, (3RS,4RS)-l -benzyl-4-[[N"-(4-pyπdιnylcarbonyl)-L-leucιnyl]amιno]-3- pyrrohdmol, l-benzyl^-KN^^-pyπdinylcarbony -L-leucinylJaminoJ-S-pyrrohdinone, 4-[[N α -(tert-butoxycarbonyl)-L-leucιnyl]amιno]- l-benzyloxycarbonyl-3- pyrrohdinone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxy)carbonyl]-L-leucιnyl]amιno]- l- [(2R)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnoI, 4-[[N α -(4-pyπdιnylmethoxy)carbonyI]-L-leucιnyl]amιno]-1-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(4-pyπdιnylmethoxy)carbony l]-L-leucιnyl]amιnoJ- 1 - [(2S)-4-methyl-2-[[(tert-butoxycarbonyl)]amιno]pentylJ-3-pyrrohdιnone, 4-[[N α -(4-pyπdιnylmethoxy)carbonyl]-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [[(tert-butoxycarbonyl)]amιnoJpentyl]-3-pyrrohdιnone, 4-[[N α -(4-pyπdιnylmethoxy)carbony l]-L-Ieucιnyl]amιno]- 1 - [(2S)-4-methyI-2-(amιno)pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(2-methylpropoxy)carbonyl]-L-leucιnyl|amιno]- l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnol, 4-[[N"-(2-methylpropoxy)carbonyl]-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(methylamιno)thιocarbonylJ-L-leucιnyllamιnoJ-l -[(2S)-4- methy!-2-[f (benzy loxycarbonyI)]amιno]pentyl]-3-pyrrohdιnol, 4-[[N α -(methylamιno)thιocarbonyl]-L-leucιnyl]amιno]- I-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)Jamιno]pentyl]-3-pyrrohdmone, (3RS,4RS)-4-[[N α -(phenylmethylamιno)carbonyl]-L-leucιnyl]amιno]- l- l(2S)-4-methyl-2-[ [(benzy loxycarbonyl)]amιno]pentyi]-3-pyrrohdιnol, 4-[[N ct -(phenylmethylamιno)carbonyl]-L-leucιnyl]amιno)- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιnoJpentylJ-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(3,4-dιchlorophenylamιno)carbonyl]-L-leucιnylJamιnoJ- l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentyI]-3-pyrrohdmol, 4-[[N α -(3,4-dιchlorophenylamιno)carbonyl]-L-leucιnyl]amιno]- l -[(2S)-4-methyl- 2-[[(benzyloxycarbonyl)Jamιno]pentyl]-3-pyrrolιdιnone, (3RS,4RS)-l -benzyl-4-[[N α -(3,4-dιchlorophenylamιno)-L-leucιnyI]amιno]-3- pyrrohdinol, 1 -benzy l-4-[[N α -(3,4-dιchlorophenylamιno)-L-leucιnyl]amιno]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -( 1 ,2,3,4-tetrahydro-6-quιnolιnecarbony l)-L-leucιny 1 Jamino]- 1 [(2S)-4-methyl-2-[(p-toluenesulphonyl)amιno]pentyl]-3-pyrrohdιnol, 4-[[N -(l ,2,3,4-tetrahydro-6-quιnohnecarbonyl)-L-leucιnyl]amιno]-l -[(2S)-4- methyl-2-[(p-toluenesulphonyl)amιno]pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(l ,2,3,4-tetrahydro-6-quιnohnecarbonyl)-L-leucιnyl]amιno]- l- [(2S)-4-methyl-2-[(acetyl)amιno]pentyI]-3-pyrrohdιnol, 4-[[[N α -(l ,2,3,4-tetrahydro-6-quιnohnecarbonyl)-L-leucιnyl]ammo]-l- [(2S)-4-methyl-2-[(acetyl)amιno]pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2- [(acetyl)amιno]pentyl]-3-pyrrolιdmoI, 4-[[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [(acetyl)amιno]pentyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]-1-[(2S)-4-methyl-2-[(p- toluenesulphonyl)amιno]pentyl]-3-pyrrohdιnol, 4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2-[(p- toluenesulphonyl)amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[ [N α -(4-fluorobenzoyl)-L-leucinyl]aminoJ- l -[(2S)-4-methyl-2- [(methanesulphonyl)amino]pentyl]-3-pyrrolidinone; 4-[fN α -(4-fluorobenzoyl)-L-leucinyl)aminoJ- 1 -[(2S)-4-methyl-2- [(methanesulphonyl)amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucinylJamino]- l -[(2S)-4-methyl-2-[(a- toluenesulphonyl)amino]pentyl]-3-pyrrolidinone; 4-[[N -(4-fluorobenzoyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[(a- toluenesulphonyl)amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-l -(2-phenethyl)-4-[[N α -(4-fluorobenzoyl)-L-leucinyl]aminoJ-3- pyrrolidinol; l-(2-phenethyl)-4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]-3-pyrrolidinone; (3RS,4RS)- l-(2-phenethyl)-4-[[N α -(2-quinolinylcarbonyl)-L-leucinyl]amino]-3- pyrrolidinol; 1-(2-phenethyl)-4-[[N α -(2-quinolinylcarbonyl)-L-leucinyl]amino]-3-pyrrolidinone; (3RS,4RS)-l-(2-phenethyl)-4-[[N α -(2-naphthylcarbonyl)-L-Ieucinyl]amino]-3- pyrrolidinol; l-(2-phenethyl)-4-[[N α -(2-naphthylcarbonyl)-L-leucinyl]amino]-3-pyrrolidinone; (3RS,4RS)-l-(2-phenethyl)-4-[[N α -(α-toluenesulphonyl)-L-leucinyl]amino]-3- pyrrolidinol; l-(2-phenethyl)-4-[[N α -(α-toluenesulphonyl)-L-leucinyl jamino J-3-pyrrolidinone; (3RS,4RS)-l-(2-phenethyl)-4-[[N α -(2-nitro-α-toluenesulphonyl)-L- leucinyl]amino]- 3-pyrrolidinol; l-(2-phenethyl)-4-[[N α -(2-nitro-α-toluenesulphonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)-4-[[N α -(2-phenylacetyl)-L-leucinyl|amino]- l -[(2S)-4-methyl-2-[[(4- pyridinylcarbonyl)]amino]pentyl]-3-pyrrolidinol; 4-[[N α -(2-phenylacetyl)-L-leucinyl]aminoJ-l-[(2S)-4-methyl-2-[[(4- pyridinylcarbonyl)]amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(2-phenylacetyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[[(p- toluenesulphonyl)]amino]pentyl]-3-pyrrolidinol; 4-[[N α -(2-phenylacetyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[[(p- toluenesulphonyl)]amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(2-phenylacetyI)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[[(4- imidazoleacetyI)Jamino]pentyl]-3-pyrrolidinol; 4-[[N α -(2-phenylacetyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2-[[(4- imidazoleacetyl)]amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[(4-phenoxybenzoyl)amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyl]-3-pyrrolidinolycarbonyl)-L- leucinyl]amino]-3-pyrrohdinol; l-(3-nitrobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)- l-(2-nitrobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinol; l-(2-nitrobenzyl)-4-[[N α -(4-pyridinylmethoxycarboπyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)-l-(4-cyanobenzyl)-4-[[[N α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinol; l-(4-cyanobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)-l-(4-bromobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyI)-L- leucinyl]amino]-3-pyrrolidinol; l -(4-bromobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)- 1 -phenethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminoJ- 3-pyrrolidinol; l -phenethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l-(3-aminobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)-l -(3-benzyloxybenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]aminoJ-3-pyrrolidinol; l-(3-benzyloxybenzyl)-4-[[N -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)- 1 -(3-hydroxybenzy l)-4-[[N α -(4-py ridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinol l-(3-hydroxybenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)-l-ethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinol; l-ethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3-pyrrolidinone; (3RS,4RS)- l-cyclopropylmethyI-4-[rN α -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinol; l -cyclopropylmethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)- l-(2-N,N-dimethylaminoethyl)-4-[[[N α -(4-pyridinylmethoxycarbonyl)- L-leucinyl]amino]-3-pyrrolidinol; l-(2-N,N-dimethylaminoethyl)-4-[[N t -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinone; (3RS,4RS)-l-(2-moφholinoethyl)-4-[[N -(4-pyridinylmethoxycarbonyl)-L- leucinyl]amino]-3-pyrrolidinonol; l-(2-moφholinoethyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; (3RS,4RS)- l -(2-bromobenzyl)-4-[[N α -(2-pyridinylmethoxycarbonyl)-L- leucinylJaminoJ-3-pyrrolidinonol; l-(2-bromobenzyl)-4-[[N α -(2-pyridinylmethoxycarbonyI)-L-leucinyl]amino)-3- pyrrolidinonone; (3RS,4RS)-4-[[N α -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl]amino]- l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)Jamino]pentyl]-3-pyrrolidinol; 4-[ [N α -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl Jamino |- l -[(2S)-4-methy 1-2- ■ [[(benzyloxycarbonyl)]amino]pentylJ-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl Jamino]- 1 - l(2S)-4-methyl-2-[[(benzyloxycarbonyl)]aminomethyl ]penty l]-3-pyrrolidinol; 4-[[N α -(4-pyrdinylmethoxy)carbonyl)-L-leuciny I Jamino |- l-[(2S)-4-methy 1-2- [[(benzyloxycarbonyl)]aminomethyl]pentylJ-3-pyrrolidinone; (3RS,4RS)-4-[[N α -[(2-pyridinylmethoxy)carbonyl]-L-leucinyl Jamino]- 1 - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]aminoJpentylJ-3-pyrrolidinol; 4-[[N ra -[(2-pyridinylmethoxy)carbonylJ-L-leucinyl]amino]- l -|(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -[(3-pyridinylmethoxy)carbonyl]-L-leucinyl]amino]- l-[(2S)-4- methyl-2-[[(benzyloxycarbonyl)]amino]pentyl]-3-ρyrrolidinol; 4-[[N α -[(3-pyridinylmethoxy)carbonyl]-L-leucinylJaminoJ-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminomethyl]- l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinol; 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyllaminomethyl]- l-[(2S)-4-methyI- 2-[[(benzyloxycarbonyl)Jamino]pentyl]-3-pyrrolidinone; (3RS,4RS)-l-benzyl-4-[[N α -(2-nitro-a-toluenesulphonyl)-L-leucinyl]amino]-3- pyrrolidinol; 1 -benzy l-4-[[[N -(2-nitro-α-toluenesulphonyl)-L-leucinyl]amino]-3-pyrrolidinone; (3RS,4RS)- l-benzyl-4-[[N α -(phenylsulphonyl)-L-leucinyl]amino]-3-pyrrolidinol; 1 -benzy I-4-[[N α -(phenylsulphonyl)-L-leucinyl]amino]-3-pyrrolidinone; (3RS,4RS)-l -benzyl-4-[[N α -(a-toluenesulphonyl)-L-leucinyI]amino]-3- pyrrolidinol; 1 -benzy l-4-[[N α -(a-toluenesulphonyl)-L-leucinyl]amino]-3-pyrrohdinone; (3RS,4RS)- l-benzyl-4-[[N α -(2-naphthylsulphonyl)-L-leucinyl]amino]-3- pyrrolidinol; 1 -benzy I-4-[[N α -(2-naphthylsulphonyl)-L-Ieucinyl]aminoJ-3-pyrrolidinone (3RS,4RS)- l -benzyl-4-[[N α -(2-naphthylcarbonyl)-L-leucinyl]amino]-3- piperidinol; 1 -benzy l-4-[[N α -(2-naphthylcarbonyl)-L-leucinyl]amino]-3-piperidinone (3RS,4RS)- l -benzyl-4-[[N α -(2-quinolinylcarbonyl)-L-leucinyl]amino]-3- piperidinol; 1 -benzy l-4-[[N ct -(2-quinolinylcarbonyl)-L-leucinyl]aminoJ-3-piperidinone; (3RS,4RS)-l-benzyl-4-[[N α -(2-naphthylsulphonyl]aminoJ-3-piperidinol; l-benzyl-4-[[N α -(2-naphthylsulphonyl)-L-leucinyl]amino]-3-piperidinone; (3RS,4RS)-4-[[N α -(benzyloxycarbonyl)-L-Ieucinyl]aminomethyl]- l - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-pyrrolidinol; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]aminomethyl]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-pyrrolidinone; (3RS,4RS)-4-[(2S)-4-methyl-2-[(benzyloxycarbonyl)aminoJpentyl]-l- [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]aminoJpentanoylJ- 3-pyrrolidinol; 4-[(2S)-4-methyl-2-[(benzyloxycarbonyl)amino]pentyl]- 1 - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amino]pentanoyl]- 3-pyrrolidinone; (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-ieucinyl]amino]- 1 - [2-[(α-toluenesulphonyl)amino]ethyl]-3-pyrrolidinol; 4-[[N α -(4-fluorobenzoyl)-L-leucinyl]aminoJ- 1 - [2-[(α-toluenesulphonyl)amino]ethyl]-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]- l-benzoyl-3-pyrrolidinol; 4-[[N α -(4-fluorobenzoyI)-L-leucinyl]amino]-l -benzoyl-3-pyrrolidinone; (3RS,4RS)-4-[[N α -(pιperonylcarbonyl)-L-leucιnyI [amino]- 1 -benzoyl-3- pyrrohdinol, 4-[[N α -(pιperonylcarbony l)-L-leucmyl Jamino]- 1 -ben7θyl-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιny I lamino]- 1 - [2-[(4-fluorobenzoyl)amιno]ethyl]-3-pyrrohdιnol, 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- l- [2-[(4-fluorobenzoyl)amιno]ethyl]-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(?grf-butoxycarbonyl)-L-leucιnyl]amιno]- l -benzoyl-3- pyrrohdinol, 4-[[N -(fgrr-butoxycarbonyl)-L-leucιnyl]amιno]- l-benzoyl-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]-l -[(2S)-4- methyl-2-[(4-fluorobenzoyl)amιno]pentyl]-3-pyrrohdιnol, 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]-l -[(2S)-4- methyl-2-[(4-fluorobenzoyl)amιno]pentylJ-3-pyrrohdmone, 4-[[N α -(4-carboxybenzoyl)-L-leucιnyl]amιno]- l-[(2S)-4- methyl-2-[(4-fluorobenzoyl)amιno]pentylJ-3-pyrrohdιnone, l-benzyl-4-[[N α -(4-carboxybenzoyl)-L-leucmyl]amιno]-3- pyrrohdinone; (3RS.4RS)- 1 -benzyl-4-[[N α -(4-carboxymethyl)benzoyl)- L-leucιnylJamιno]-3-pyrrohdιnol, 1 -benzy l-4-[[N α -(4-carboxymethyl)ben7oyl)-L-leucιnyl]amιnoJ-3-pyrrohdιnone, (3RS,4RS)-4-[[N α -[(4-carboxymethyi)benzoyl]-L-leucιnyl]amιno]-l- [(2S)-4-methyl-2-[[(4-fluorobenzoyl)amιno]pentyll-3-pyrrohdιnol, 4-[[N α -[(4-carboxymethyl)benzoy I J-L-leucinyl Jamino]- l -[(2S)-4- methyl-2-[[(4-fluorobenzoyl)amιno]pentylJ-3-pyrrolιdιnone, (3RS,4RS)-l -phenethyl-4-[[N α -(2-amιno-α-toluenesulphonyl)-L-leucιnyl]amιno]-3- pyrrohdinol, l-phenethyl-4-[[N α -(2-amιno-α-toluenesulphonyl)-L-leucιnyl]amιno]-3- pyrrohdinone, (3RS,4RS)-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιno]-l-benzoyl-3- pipeπdinol, 4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιno]-l-benzoyl-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(2-quιnohnecarbonyl)-L-leucιnyl]amιno]-l-benzoyl-3- pipeπdinol, 4-[[N α -(2-quιnohnecarbonyl)-L-leucιny IJamino]- 1 -benzoy 1-3-pιperιdιnone, (3RS,4RS)-4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno]- l-benzoyl-3- pipeπdinol, 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amtno]-l -benzoyl-3-pιperιdιnone, (3RS,4RS)-4-[[(2S)-4-methyl-2-(benzyl)oxy]pentanoyl]- 1 - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentanoyl]- 3-pιpeπdιnol, 4-[[(2S)-4-methyl-2-(benzy l)oxy]pentanoyl]- 1 - [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentanoylJ- 3-pιpeπdιnone, (3RS,4RS)-4-[[3-(2-pyrιdyl)phenylacetyl)]amιno]-l-[3-(2-pyπdyl)phenylacetyl)]-3-pιperιdιnol, 4-[[3-(2-pyπdyI)phenylacetyl)]amιno]- l-[3-(2-pyπdyl)phenylacetyl)]-3- pipeπdinone, (3RS,4RS)-4-[[N α -(p-tππuoromethanephenylsulphonyl)- L-leucιnyl]amιno]-] -[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnol, 4-[[N α -(p-tπfluoromethanephenylsulphonyl)- L-leucιnyl]amιno]-l -[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(2-naphthylsulphonyl)- L-leucιnyl]amιno]- l -[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnol, 4-[[N α -(2-naphthylsulphonyl)- L-leucιnyl]amιno]-l-[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(3,4-dιchlorophenylsulphonyl)- L-leucmyl Jamino]- l-[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnol, 4-[[N α -(3,4-dιchlorophenylsulphonyl)- L-leucιnyl]amιnoJ-l-[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(methanesulphonyl)-L-leucιnyl]amιno}- l-[3-(2-pyπdyl)phenylacetyl)]-3- pipeπdinol, 4-[[N rt -(methanesulphonyl)-L-leucιnylJamιno]-l-[3-(2-pyπdyl)phenylacetyl)]-3-pιpeπdιnone, (3RS,4RS)-4-[[N α -(4-fluorophenylsulphonyl)-L-leucιnyl]ammo]-l-[3-(2- pyπdyl)phenylacetyl)]-3-pιpeπdιnol, or 4-[[N α -(4-fluorophenylsulphonyl)-L-leucιnyl]amιno]-l-[3-(2-pyπdyl)phenylacetyI)]-3- pipeπdinone, or a phamaceutically acceptable salt thereof 17 A compound according to claim 1 which is 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone, 4-[[N α -(benzyIoxycarbonyl)-L-leucιnyl]amιno]-l-[4-(phenoxybenzamιde)]-3- pyrrohdinone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnylJamιnoJ-l -[4-(bιphenylethanoyl)]-3- pyrrohdinone, 4-[[N α -(benzyloxycarbonyl)-L-leucιny ljamino]- 1 -| (2S)-4-methyl-2- [[(benzyloxycarbonyl)Jamιnomethyl]pentanoyll-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2-[ |(tert- butoxyoxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnonone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- (amιnomethyl)pentanoylJ-3-pyrrohdιnone, 4-[[N"-(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -tert-butoxycarbony 1-3- pyrrolidinone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno)-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyI-2-[[(N-tert- butoxycarbonyl)ethanoylJamιnomethyl]pentanoylJ-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[(2S)-4-methyl-2- [(ethanoyl)amιnomethyl]pentanoyl]-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnylJamιno]- l -[(2S)-4-methyl-2-[[(tert- butoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbony)-L-leucιnyl jamino]- 1 -[(2R)-4-methyI-2- [[(benzyloxycarbonyl)Jamιno]pentanoyl]-3-pyrrohdιnone, 4-[[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιnoJ- 1 -[2- [(benzyloxycarbonyl)amιno]ethanoyl]-3-pyrrohdιnonone, 4-[[N α -(benzyloxycarbony)-L-leucιnyl Jamino]- 1 -[(2S)-2- [[(benzyloxycarbonyl)]amιno]propanoyl]-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbony l)-L-leucιny I Jamino ]- l-[cyclohexanepropanoyl]-3- pyrrolidinone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2-[[(4- pyπdιnylmethoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιnoJ- l-[(2S)-4-methyl-2-[[(2- pyπdιnylmethoxycarbonyl)]amιno]pentanoyl]-3-pyrrolιdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]-l -[(2S)-4-methyl-2-[[(3- pyπdιnylmethoxycarbonyl)]amιno]pentanoyl]-3-pyrrolιdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-(2-pyπdylcarbonyl)-3- pyrrohdinone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιnoJ- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιpeπdιnone, 4-[[N α -(benzyloxycarbonyl)-L-ieucιnyllamιnoJ- l-[4-(bιphenyl)ethanoyl]-3- pipeπdmone, 4-[[N -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminomethyl]pentanoyl]-3-piperidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl Jamino]- 1 -tert-butoxycarbony 1-3- piperidinone; 4-[[N α -(benzyloxycarbony l)-L-)eucinyl]amino]- I -[2-[[(benzy loxycarbony l)]iso- butylamino]ethanoyl]-3-piperidinone; 4-[[N -(benzyloxycarbonyl)-L-leucinyl]amino]-l -[2-[(tert- butoxycarbonyl)aminoJethanoylJ-3-piperidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino)- l -[2-(amino)ethanoylJ-3- piperidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-(4-methylpentanoyl)-3- piperidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-(benzoyl)-3-piperidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-(acetyl)-3-ρiperidinone; 4-f[N α -(benzy loxycarbony l)-L-Ieucinyl]amino]- l-(2-pyridoxyacetyl)-3- piperidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]aminoJ- 1 -[2- [(benzyloxycarbonyl)methylamino]ethanoyl]-3-piperidinone; 4-[[N α -(benzyloxycarbony)-L-leucinyl]amino]-l -[3-(2-pyridyl)phenylacetyl)]-3- piperidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-[2- [(benzyloxycarbonyl)methylaminoJethanoylJ-3-pyrrolidinone; 4-[[N α -(benzyloxycarbonyI)-L-leucinyl]aminoJ-l-[2-(phenoxy)ethanoyll-3- pyrrolidinone; 4-[[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-[(2-phenyl)ethanoyl]- 3-pyrroIidinone; 4-[[N α -(4-pyridinylmethoxycarbony)-L-leucinyl Jamino]- l-ethanoyl-3- pyrrolidinone; 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-(4-cyanobenzoyl)-3- pyrrolidinone; 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l -tert-butoxycarbony 1-3- pyrrolidinone; 4-[[N α -(3-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-l-tert-butoxycarbonyl-3- pyrrolidinone; 4-[[N α -(3-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3-pyrrolidinone; 4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3-pyrrolidinone; 4-[[N α ιdιnylmethoxycarbonyl)-L-leucιnyl]amιnoJ- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιnomethyl]pentanoyl]-3-pyrrohdιnone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl JaminoJ- l-[(2S)-4- methyl-2-[l(4- pyndιnylmethoxycarbonyl)]amιno]pentanoyl]-3-pyrrohdιnone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιnoJ- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιnomethyl]pentanoylJ-3-pyrrohdιnone, 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-l-[ l - (adamantyl)carbonyl]-3-pyrrohdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l-(4-methyl-pentanoyl)-3- pyrrohdmone, 4-[[N α -(benzyloxycarbonyI)-D-leucιnyl]amιno|-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιpeπdιnone, 4-[[N α -(tert-butoxycarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)Jamιno]pentanoyl]-3-pιpeπdιnone 4-[[N α -(benzy loxycarbony I)-N ε -(tert-butoxycarbonyl)-L-lysιneJamιno]- l- [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιpeπdιnone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl Jamino]- 1 -tert-butoxycarbony 1-3- piperidinone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l -(4-methylpentanoyl)-3- piperidmone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l-[2- (benzyloxycarbonyl)]ιso-butylamιno]ethanoylJ-3-pιpeπdιnone, 4-[[N-2-(benzyloxycarbonyl)]ιso-butylamιno]ethanoyl]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιperιdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιno]- l -(methanesulphonyl)-3- pipeπdinone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιnoJ- l -(pheny Isulphony l)-3- piperidinone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-l -(8-quιnohnesulphonyl)- 3-pyrrohdιnone, 4-[[N α -(4-pyndιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l-(2-pyπdylsulphonyl)-3- pyrrolidinone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]ammo]-l - f(2-propoxy)carbonyl]-3-pyrrolιdιnone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucmyl]amιno]-l -[(3-methyl- l - propoxy)carbonyl]-3-pyrrolidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]amino]-l-[(4-phenoxy)phenylsulphonyl]-3- pyrrolidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]aminoJ- 1 - [(4-phenoxy)phenylsulphonyl]-3-piperidinone; 4-[[N α -(3,4-dichlorobenzoyl)-L-leucinyl]aminoJ- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; 4-[[N 0t -(6-quinolinecarbonyl)-L-leucinyl]amino]-l -[(2S)-4-methyI-2- [[(benzyloxycarbonyl)]amino]pentyIJ-3-pyrrolidinone; 4-[(2-dibenzofuransulphonyl)arnino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentanoyI]-3-pyrrolidinone; 4-[(2-dibenzofuransulphony l)aminoJ- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]methylamino]pentanoyl]-3-pyrrolidinone; 4-[[N°-(benzyloxycarbonyl)-L-leucinyl]amino]- 1 -(4-methy Ipenty l)-3-piperidinone; 4-[[N α -(2-pyridylcarbonyI)-L-leucinyl]amino]- 1 -(4-methy Ipenty l)-3-piperidinone; 4-[[N"-(3-chlorobenzoyl)-L-Ieucinyl]aminoJ-l -(4-methylpentyl)-3-piperidinone; 4-[[N α -(2-quinolinecarbonyl)-L-leucinyI]amino]-l -(4-methy Ipentyl)-3- piperidinone; 4-[[N α -(3,4-dichlorobenzoyl)-L-leucinylJaminoJ-l -(4-methylpentyl)-3- piperidinone; 4-[[N α -(8-quinolinecarbonyl)-L-leucinyl]amino]- l-(4-methylpentyl)-3-piperidinone 4-[[N α -(3-isoquinolinecarbonyl)-L-leucinyl]amino]- l-(4-methylpentyl)-3- piperidinone; 4-[[N α -(2-pyridinylmethoxycarbonyl)-L-leucinyI Jamino]- l-(4-methylpentyl)-3- piperidinone; 4-[[N α -(acetyl)-L-leucinyl]amino]-l -(4-methy lpentyl)-3-piperidinone; 4-[[N -(p-trifluoromethylbenzenesulphonyl)-L-leucinyl]amino]- l-(4- methylpentyl)-3-piperidinone; 4-[[N OI -(6-quinolinecarbonyl)-L-leucinyl]amino]-1-(4-methylpentyl)-3- piperidinone; 4-[[2-(RS)-[(3-biphenyl)-4-methyl]amino]pentanoyl]-l-(4-methylpentyl)-3- piperidinone; 4-[[N α -(benzy loxycarbonyl)-L-leucinyl]amino]- 1 - [2-[(benzyloxycarbonyl)methylamino]ethyl]-3-piperidinone; 4-[[N α -(a-toluenesulphony l)-L-leucinyl]amino]- 1 -[3-(2-pyridyl)phenylacety l)]-3- piperidinone; 4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιno]- l-[3-(2-pyπdyl)phenylacetyl)J-3- pipeπdinone, 4-[[N α -(benzensulphonyl)-L-leucιnyl]amιno]- l-[3-(2-pyπdyl)phenylacetyl)]-3- pipeπdinone, 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyllamιno]- l -[3-(2-pyπdyl)phenylacetyl)]- 3-pιpeπdιnone; 4-[3-[(2-pyπdyl)phenylacetyl)]amιno]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentanoyl]-3-pιpeπdιnone, 4-[3-[(2-pyπdyl)phenylacetyl)]amιno]- 1-[(2S)-4-methyl-2-[[2- (pyridinylmethoxycarbonyl)Jamino]pentanoylJ-3-piperidinone, 4-[[N α -(2-phenylacetyl)-L-leucmyl]amιno]- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, 4-[[N α -(tert-butoxyoxycarbonyl)-L-leucιnyl |amιno]- 1 -[(2S)-4-methyl-2- [[(benzy loxycarbony l)Jamιno)pentyl]-3-pyrrohdιnone, 4-[(L-leucιnyl)amιno]-l -[(2S)-4-methyl-2-[ [(benzy loxycarbony l)]amιno]pentyl ]-3- pyrrolidinone, 4-[[N α -(2-quιnohnecarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)Jamιno]pentyl]-3-pyrrohdιnone, 4-[[N α -(pιperonylcarbonyl)-L-leucιnyl]amιno]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentylJ-3-pyrrohdιnone, 4-[[N α -(2-pyπdylcarbonyl)-L-leucιnyl]amιno]-l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, 4-[[N -(2-nιtro-a-toluenesulphonyl)-L-leucιnyl]amιno)- l-[(2S)-4-methyl-2- [l(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, 4-[[N α -(8-quιnolιnesulphonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrolιdιnone, 4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιnomethyl]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)lamιno]pentyl]-3-pyrrohdιnone, 4-[[N α -(2-quinohnylcarbonyl)-L-leucιnyl]amιnomethyl]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrolιdιnone, 4-[[N -(phenylacetyl)-L-leucιnyl]amιnoJ- 1 -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnone, 4-[[N α -(4-pyridιnylmethoxycarbonyl)-L-leucιnyl]amιno]- l-[(2S)-4-methyl-2- [[(benzy loxycarbony l)]amιno]pentyl]-3-pιpeπdιnone, 4-[[N α -(4-pyπdιnylmethoxycarbonyl)-L-leucιnyl]amιno]-l -[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnone, 4-[[N α -(phenylacetyl)-L-leucιnyl]amιno]- 1 -[(2R)-4-methyl-2- [ [(benzy loxycarbony l)]amιno]pentyl]-3-pιpeπdιnone, 4-[[N -(4-ιmιdazoleacetyl)-L-leucιnyl]amιno]- 1 -[(2R)-4-methyl-2- [[(benzy loxycarbony l)]amιno]pentyl]-3-pιpeπdιnone, 4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnylJammo]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnone, 4-[[N α -(4-pyπdιnylcarbonyl)-L-leucιnyl]amιno]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pιpeπdιnone, 4-[[N α -(tert-butoxycarbonyl)-L-leucmyl]amιno]-l -(benzy loxycarbony l)-3- pipeπdinone, 4-[[N α -(8-quιnohnesulphonyl)-L-leucιnyl]amιno]-l-(ben7yloxycarbonyl)-3- pipeπdinone, 4-[[N α -(4-ρyπdιnylacetyl)-L-leucιnyl]amιnoJ-l-(benzyloxycarbonyl)-3- pipeπdinone, 4-[[N α -(4-ιmιdazoleacetyl)-L-leucιnyl]amιno]- l-(benzyloxycarbonyl)-3- pipeπdinone, 4-[[N -(4-pyπdιnylcarbonyl)-L-leucιnyl]amιno]- l -(benzy loxycarbony l)-3- piperidinone, 1 -benzy l-4-[[N α -(3-ιsoquιnohnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrolιdιnone, l -benzyl-4-[[N α -(3,4-dιchlorobenzoyl)-L-leucιnyl]amιno]-3-pyrrohdιnonc, 1 -benzy l-4-[[N -(2-naphthylcarbonyl)-L-leucιnyl]amιnomethyl]-3-pyrrolιdιnone, l-benzyl-4-[[N α -(2-quιnolιnylcarbonyl)-L-leucιnyl[amιnomethyl]-3-pyrrohdιnone, l-benzyl-4-[[N α -(2-quιnolmylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, 1 -benzy l-4-[[N α -(pιperonyicarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, 1 -benzy l-4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, l-benzyl-4-[[N α -(6-hydroxy-2-naphthylcarbonyl)-L-Ieucιnyl]amιno]-3- pyrrohdinone, l-benzyl-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, l-benzyl-4-[[N α -(6-quιnohnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, 1 -benzy l-4-[[N"-(4-ιmιdazoleacetyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, l-benzyl-4-[[N α -(4-pyπdιnylcarbonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, 4-[[N α -(tert-butoxycarbonyl)-L-leucιnyl]amιno]-l-benzyloxycarbonyl-3- pyrrolidinone, 4-[[N α -(4-pyπdιnylmethoxy)carbonyl]-L-leucιnyI]amιno]- l-[(2R)-4-methyl-2- [[(benzyloxycarbonyl)]amιno]pentyl]-3-pyrrohdιnone, 4-[[N -(4-pyridinylmethoxy)carbonyl]-L-leucinyl]amino]-l-[(2S)-4-methyl-2- |[(tert-butoxycarbonyl)]amino]pentyl]-3-pyrrolidinone; 4-[[N α -(4-pyridinylmethoxy)carbonyl]-L-leucinyl Jamino]- 1 - [(2S)-4-methyl-2-(amino)pentyl]-3-pyrrolidinone; 4-[[N -(2-methylpropoxy)carbonyl]-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)JaminoJpentylJ-3-pyrrolidinone; 4-[lN α -(methylamino)thiocarbonyl]-L-leucinyl]amino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; 4-[[N α -(phenylmethylamino)carbonyl]-L-leucinyl]amino]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)JaminoJpentyI]-3-pyrrolidinone; 4-[[N α -(3,4-dichlorophenylamino)carbonyl]-L-leucinyl]amino]-l -[(2S)-4-methyl- 2-[[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; l-benzyl-4-[[N α -(3,4-dichlorophenylamino)-L-leucinyIJaminoJ-3-pyrrolidinone; 4-[[N α -(l,2,3,4-tetrahydro-6-quinoIinecarbonyl)-L-leucinylJamino]-l -[(2S)-4- methyl-2-[(p-toluenesulρhonyl)amino]pentyl]-3-pyrrolidinone; 4-[[[N α -(l ,2,3,4-tetrahydro-6-quinolinecarbonyl)-L-leucinyl]amino]-l- [(2S)-4-methyl-2-[(acetyl)amino]pentyl]-3-pyrrolidinone; 4-[[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]- l-[(2S)-4-methyl-2- [(acetyl)amino]pentyl]-3-pyrroIidinone; 4-[[N α -(4-fluorobenzoyl)-L-leucinyl]aminoJ-1 -|(2S)-4-methyl-2-[(p- toluenesulphonyl)amino]pentyl]-3-pyrrolidinone; 4-[[N α -(4-fluorobenzoyl)-L-Ieucinyl]amino]-1-[(2S)-4-methyl-2- [(methanesulphonyl)amino]pentyl]-3-pyrrolidinone; 4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]- l -[(2S)-4-methyl-2-[(a- toluenesulphonyl)amino]pentyl]-3-pyrrolidinone; l-(2-phenethyl)-4-[[N α -(4-fluorobenzoyl)-L-leucinyl]amino]-3-pyrrolidinone; l-(2-phenethyl)-4-[[N α -(2-quinolinylcarbonyl)-L-leucinyl]amino]-3-pyrrolidinone; l-(2-phenethyl)-4-[[N -(2-naphthylcarbonyl)-L-leucinyl]amino]-3-pyrrolidinone; l-(2-phenethyl)-4-[[N α -(α-toluenesuIphonyl)-L-leucinyl]amino]-3-pyrrolidinone; l-(2-phenethyl)-4-[[N α -(2-nitro-α-toluenesulphonyl)-L-leucinyl]amino]-3- pyrrolidinone; 4-[[N α -(2-phenylacetyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[[(4- pyridinylcarbonyl)]amino]pentyl]-3-pyrrolidinone; 4-[rN α -(2-phenylacetyl)-L-leucinyI]amino]-l-[(2S)-4-methyl-2-[[(p- toluenesulphonyl)]amino]pentyI]-3-pyrrolidinone; 4-[[N -(2-phenylacetyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2-[[(4- imidazoleacetyl)]amino]pentyl]-3-pyrrolidinone; l-(3-nitrobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l-(2-nitrobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminol-3- pyrrolidinone; l-(4-cyanobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l-(4-bromobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l -phenethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l-(3-aminobenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l-(3-benzyloxybenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl)amino]-3- pyrrolidinone; 1 -(3-hydroxybenzyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l-ethyl-4-[[N α -(4-pyridinyimethoxycarbonyl)-L-leucinyl]amino]-3-pyrrolidinone; l-cyclopropylmethyl-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l-(2-N,N-dimethylaminoethyl)-4-[[N 0l -(4-pyridinylmethoxycarbonyl)-L- leucinylJamino]-3-pyrrolidinone; l-(2-morpholinoethyl)-4-[[N α -(4-pyridinylmethoxycarbonyl)-L-leucinyl]amino]-3- pyrrolidinone; l-(2-bromobenzyl)-4-[[N α -(2-pyridinylmethoxycarbonyl)-L-leucinyllamino]-3- pyrrolidinonone; 4-[[N α -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; 4-[[N α -(4-pyrdinylmethoxy)carbonyl)-L-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]aminomethyl]pentyl]-3-pyrrolidinone; 4-[[N α -[(2-pyridinylmethoxy)carbonyl]-L-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; 4-[[N α -[(3-pyridinylmethoxy)carbonyl]-L-leucinyl]amino]-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; 4-[[N α -(benzyloxycarbonyl)-L-leucinyl]aminoJ-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; 4-[[N -(4-pyridinylmethoxycarbonyl)-L-leucinyl]aminomethyl]- l-[(2S)-4-methyl- 2-[[(benzyloxycarbonyl)]amino]pentyl]-3-pyrrolidinone; l-benzyl-4-[[[N -(2-nιtro-α-toluenesulphonyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, 1 -benzy l-4-[[N α -(phenylsulphonyl)-L-leucιnyl)amιno]-3-pyrrolιdιnone, l-benzyl-4-[[N α -(a-toluenesulphonyl)-L-leucιnyl]amιno]-3-pyrιohdιnone, 1 -benzy l-4-[[N α -(2-naphthy Isulphony l)-L-leucιnyl]amιno]-3-pyrrohdιnone 1 -benzy l-4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]amιnoJ-3-pιpeπdιnone 1 -benzy l-4-[[N α -(2-quιnolmylcarbonyl)-L-leucιnylJamιno]-3-pιpeπdιnone, 1 -benzy l-4-[[N α -(2-naphthylsulphonyl)-L-leucιnyl]aιτnno|-3-pιpeπdιnone, 4-[[N α -(benzyloxycarbonyl)-L-leucιnyl]amιnomethyl]- l -[(2S)-4-methyl-2- [[(benzyloxycarbonyl)Jamιnomethyl]pentanoylJ-3-pyrrohdιnone, 4-[(2S)-4-methyl-2-[(benzyloxycarbonyl)amιno]pentyl|- l- [(2S)-4-methyl-2-[[(benzyloxycarbonyl)]amιno]pentanoylJ- 3-pyrrohdmone, 4-[[N α -(4-fluorobenzoy l)-L-leucιnyl]amιnoJ- 1 - [2-[(α-toluenesulphonyl)amιno]ethyl]-3-pyrrohdιnone, 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]-l-benzoyl-3-pyrrohdιnone, 4-[[N α -(pιperonylcarbonyl)-L-leucιnyl]amιno]-l -benzoyl-3-pyrrohdιnone, 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιno]- 1 - [2-[(4-fluorobenzoyl)amιno]ethyl]-3-pyrrohdιnone, 4-[[N oc -(/grf-butoxycarbonyl)-L-leucιnyl]dmιno]- l-benzoyl-3-pyrrolιdιnone, 4-[[N α -(4-fluorobenzoyl)-L-leucιnyl]amιnol- 1 -[(2S)-4- methyl-2-[(4-fluorobenzoyl)amιno]pentyl]-3-pyrrohdιnone, 4-[[N α -(4-carboxybenzoyl)-L-leucιnyl]amιno]-l-[(2S)-4- methyl-2-[(4-fluorobenzoyl)amιno]pentyl|-3-pyrrohdιnone, 1 -benzy l-4-[[N α -(4-carboxybenzoyl)-L-leucιnyl]amιno]-3- pyrrolidinone, l-benzyl-4-[[N α -(4-carboxymethyl)benzoyl)-L-leucιnyl]amιno]-3-pyrrohdιnone, 4-[[N α -[(4-carboxymethyl)benzoyl]-L-leucιnyl]amιno]- l-[(2S)-4- methyl-2-[[(4-fluorobenzoyl)amιno]pentyl]-3-pyrrohdιnone, l -phenethyl-4-[[N α -(2-amιno-α-toluenesulphonyl)-L-leucιnyl]amιno]-3- pyrrolidinone, 4-[[N α -(2-naphthylcarbonyl)-L-leucιnyl]ammo]-l-benzoyl-3-pιpeπdιnone, 4-[[N α -(2-quιnohnecarbonyl)-L-leucιnyl]amιno]-l -benzoyI-3-pιperιdιnone, 4-[[N α -(3-ιsoquιnohnecarbonyl)-L-leucιnyl]amιno]-l-benzoyl-3-pιpeπdιnone, 4-[[(2S)-4-methyl-2-(benzyl)oxy]pentanoylJ-l-[(2S)-4-methyl-2- [[(benzyloxycarbonyl)]ammo]pentanoyl]- 3-pιpeπdιnone, 4-[[3-(2-pyπdyl)phenylacetyl)]amιno]- l-[3-(2-pyπdyl)phenylacetyl)]-3- pipeπdinone, 4-[[N α -(p-trifluoromethanephenylsulphonyl)-L-leucinyl]amino]- l-[3-(2-pyridyI)phenylacetyl)J- 3-piperidinone; 4-[[N -(2-naphthylsulphonyl)-L-leucinyl]amino]- l-[3-(2-pyridyl)phenylacetyl)]-3- piperidinone; 4-[[N α -(3,4-dichlorophenylsulphonyl)- L-leucinyl]amino]- l-[3-(2-pyridyI)phenylacetyl)]-3-piperidinone; 4-[[N α -(methanesulphonyl)-L-leucinyl]amino]-l -[3-(2-pyridyl)phenylacetyl)]-3-piperidinone; or 4-[[N α -(4-fluorophenylsulphonyl)-L-leucinyl]amino]-l -[3-(2-pyridyl)phenylacetyl)]-3- piperidinone; or a phamaceutically acceptable salt thereof. 18. A pharmaceutical composition comprising a compound according to any one of claims 1 to 17 and a pharmaceutically acceptable carrier. 19. A method of inhibiting a cysteine protease which comprises administering a compound according to claim 1. 20. A method according to claim 19 wherein the cysteine protease is cathepsin K. 21. A method of inhibiting bone loss which comprises administering a compound according to claim 1. 22. A method of treating osteoporosis which comprises administering a compound according to claim 1. 23. A method of treating gingival or peridontal disease which comprises administering a compound according to claim 1. 24. A method of treating a disease characterized by excessive cartilage or matrix degradation which comprises administering a compound according to claim 1. 25. A method according to claim 24 wherein said disease is osteoarthritis or rheumatoid arthritis. 26 A compound according to any one of claims 1 to 17 for use as a medicament 27 The use of a compound of the formula (1) as defined in claim 1 in the manufacture of a medicament for the treatment of diseases in which inhibition of a cysteine protease is a factor 28 The use of a compound according to claim 27 wherein the cysteine protease is cathepsin K 29 The use of a compound of the formula (I) as defined in claim 1 in the manufacture of a medicament for the inhibition of bone loss 30 The use of a compound of the formula (I) as defined in claim 1 in the manufacture of a medicament for the treatment of osteoporosis 31 The use of a compound of the formula (I) as defined in claim 1 in the manufacture of a medicament for the treatment of gingival or peπdontal disease 32 The use of a compound of the formula (I) as defined in claim 1 in the manufacture of a medicament for the treatment of diseases characterized by excessive cartilage or matrix degradation 33 The use of a compound according to claim 32 wherein the disease characterized by excessive cartilage or matrix degradation is osteoarthntis or rheumatoid arthritis 34 A process for preparing a compound of the formula (I) as defined in claim 1 , which process comprises (A) for compounds in which A is CH(OH) (l) reacting a compound of the formula (III) or a salt thereof, wherein R ' , R", R'" and n are as defined in formula (I) of claim 1 , with any reactive functional groups protected, with (a) R-^C(0)C1, in which R 5 ιs as defined in formula (I) of claim L or (b) R 5 C(0)OH, in which R 5 ιs as defined in formula (I) of claim 1 , in the presence of EDC and HOBT, or (c) as defined in formula (I) of claim 1 , followed by reduction, or (d) R 5 OC(0)Cl, in which R 5 ιs as defined in formula (I) of claim 1 , in the presence of base, or (e) R-*Sθ2Cl, in which R*ιs as defined in formula (I) of claim 1 , in the presence of base, or 6 O (f) R wherein R 3 , R 6 and R 7 are as defined in formula (I) of claim 1 , or (g) adamantyl-C(O)Cl, (n) reacting a compound of the formual (IV) wherein R 2 , R'" and n are as defined in formula (I) of claim 1 , with any reactive functional groups protected, with (a) , in which R 3 , R 4 and R' are as defined in formula (I) of claim 1 , in the presence of EDC and HOBT; or (b) , in which R* is as defined in formula (I) of claim 1 , in the presence of EDC and HOBT; or (c) , in which Y is as defined in formula (I) of claim 1 , in the presence of EDC and HOBT; or (iii) reacting a compound of the formual (V): (V) wherein R'" and n are as defined in formula (I) of claim 1 , with any reactive functional groups protected, and R a is Ci .galkyl, C3_6cycloalkyl-Co-6 a lkyl, Ar-Co_6alkyl, or Het-Co- a lkyl with: (a) , in which R 3 , R 4 and R' are as defined in formula (I) of claim 1 , in the presence of EDC and HOBT; or (b) , in which R* is as defined in formula (I) of claim 1, in the presence of EDC and HOBT; or (c) υ , in which Y is as defined in formula (I) of claim 1 , in the presence of EDC and HOBT; or (B) for compounds in which A is C(O): (i) reacting a compound of the formual (VI): wherein R^ , R 2 , R", R'" and n are as defined in formula (I) of claim 1 , with any reactive functional groups protected, with an oxidizing agent; and thereafter removing any protecting groups and optionally forming a pharmaceutically acceptable salt.

Inventors: LO CASTRO STEPHEN, MARQUIS ROBERT W JR, RU YU, VEBER DANIEL F, LO CASTRO, STEPHEN, MARQUIS, ROBERT, W., JR., RU, YU, VEBER, DANIEL, F.
Applicants: LO CASTRO STEPHEN, MARQUIS ROBERT W JR, RU YU, SMITHKLINE BEECHAM CORP, VEBER DANIEL F, LO CASTRO, STEPHEN, MARQUIS, ROBERT, W., JR., RU, YU, SMITHKLINE BEECHAM CORPORATION, VEBER, DANIEL, F.
Application year: 1997
Main classification: A61K31
IPC codes: A61K31, A61P1, A61P19, A61P21, A61P29, A61P31, A61P35, A61P43, C07D207, C07D211, C07D401, C07D405, C12N9, C12Q1, G01N33