Compounds which inhibit leukocyte adhesion mediated by VLA-4

A compound of the formula:

• wherein:
• R1 is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, heteroaryl and substituted heteroaryl;
• R2 is selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, cycloalkenyl, substituted cycloalkenyl, heterocyclic, substituted heterocyclic, aryl, substituted aryl, heteroaryl, substituted heteroaryl, or R1 and R2 together with the nitrogen atom abound to R2 and the SO2 group bound to R1 form a heterocyclic or a substituted heterocyclic group;
• R3 is selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, substituted heterocyclic or R2 and R3 together with the nitrogen atom bound to R2 and the carbon atom bound to R3 from a saturated heterocyclic group or a saturated substituted heterocyclic group with the proviso that when monosubstituted, the substituent on said saturated substituted heterocyclic group is not carboxyl;
• R6 is selected from the group consisting of 2,4-dioxo-tetrahydrofuran-3-yl (3,4-enol), amino, alkoxy, substituted alkoxy, cycloalkoxy, substituted cycloalkoxy, —O—(N-succinimidyl), —NH-adamantyl, —O-cholest-5-en-3-β-yl, —NHOY where Y is hydrogen, alkyl, substituted alkyl, aryl, and substituted aryl, —NH(CH2)pCOOY where p is an integer of from 1 to 8 and Y is as defined above, —OCH2NR9R10 where R9 is selected from the group consisting of —C(O)-aryl and —C(O)-substituted aryl and R10 is selected from the group consisting of hydrogen and —CH2COOR11 where R11 is alkyl, and —NHSO2Z″ where Z″ is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic or substituted heterocyclic;
• Q is —C(X)NR7— wherein R7 is selected from the group consisting of hydrogen and alkyl;
• X is selected from the group consisting of oxygen and sulfur;
• R5 is —CH2X′ is selected from the group consisting of hydrogen, hydroxyl, acylamino, alkyl, alkoxy, aryloxy, aryl, aryloxyaryl, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted alkyl, substituted alkoxy, substituted aryl, substituted aryloxy, substituted aryloxyaryl, substituted cycloalkyl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic;
• with the further provisos that:
• A. R5 is not selected from the group consisting of —(CH2)n-aryl and —(CH2)n-heteroaryl where n is an integer equal to 1 to 4 when R2 and R3 together with the nitrogen atom bound to R2 and the carbon atom bound to R3 form a saturated heterocyclic group or a saturated substituted heterocyclic group;
• B. R5 is not —(CH2)x—Ar—R5′ where R5′ is —O—Z—NR30R30′ or —O—Z—R12, wherein R30 and R30′ are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, and where R30 and R30′ are joined to form a heterocycle or a substituted heterocycle, R12 is selected from the group consisting of heterocycles and substituted heterocycles, and Z is selected from the group consisting —C(O)— and —SO2—.
• Ar is aryl, heteroaryl, substituted aryl or substituted heteroaryl,
• x is an integer of from 1 to 4;
• C. R5 is not —(CH2)x—Ar—R5″ where R5″ is selected from the group consisting of —NR24C(Z′)NR8R8′ and —NR24C(Z′)R13 wherein Z′ is selected from the group consisting of oxygen, sulfur and NR24, R24 is selected from the group consisting of hydrogen, alkyl and aryl, R8 and R8′ are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, heteroaryl and substituted heteroaryl provided that when Z′ is oxygen, at least one of R8 and R8′ is substituted alkyl, cycloalkyl, substituted cycloalkyl, saturated heterocyclic other than morpholino and thiomorpholino, substituted heterocyclic or R8 and R8′ are joined to form a saturated heterocycle other than morpholino or thiomorpholino, a saturated substituted heterocycle or a saturated/unsaturated heterocycle having an amino group substituted with an alkoxycarbonyl substituent, and further provided that when Z′ is sulfur, at least one of R8′ and R9 is a group other than aryl, substituted aryl, heteroaryl or substituted heteroaryl, R13 is selected from the group consisting of substituted heterocycles and saturated heterocycles other than morpholino and thiomorpholino,
• Ar is aryl, substituted aryl, heteroaryl or substituted heteroaryl,
• x is an integer of from 1 to 4;
• D. R5 is not —ALK—X″ where ALK is an alkyl group of from 1 to 10 carbon atoms attached via a methylene group (—CH2—) to the carbon atom to which it is attached;
• X″ is selected from the group consisting of substituted alkylcarbonylamino, substituted alkenylcarbonylamino, substituted alkynylcarbonylamino, heterocyclylcarbonylamino, substituted heterocyclylcarbonylamino, acyl, acyloxy, aminocarbonyloxy, acylamino, oxycarbonylamino, alkoxycarbonyl, substituted alkoxycarbonyl, aryloxycarbonyl, substituted aryloxycarbonyl, cycloalkoxycarbonyl, substituted cycloalkoxycarbonyl, heteroaryloxycarbonyl, substituted heteroaryloxycarbonyl, heterocyclyloxycarbonyl, substituted heterocyclyloxycarbonyl, cycloalkyl, substituted cycloalkyl, saturated heterocyclic, substituted saturated heterocyclic, substituted alkoxy, substituted alkenoxy, substituted alkynoxy, heterocyclyloxy, substituted heterocycloxy, substituted thioalkyl, substituted thioalkenyl, substituted thioalkynyl, aminocarbonylamino, aminothiocarbonylamino, guanidino, amidino, alkylamidino, thioamidino, halogen, cyano, nitro, —OS(O)2-alkyl, —OS(O)2-substituted alkyl, —OS(O)2-cycloalkyl, —OS(O)2-substituted cycloalkyl, —OS(O)2-aryl, —OS(O)2-substituted aryl, —OS(O)2-heteroaryl, —OS(O)2-substituted heteroaryl, —OS(O)2-heterocyclic, —OS(O)2-substituted heterocyclic, —OSO2—NRR, —NRS(O)2-alkyl, —NRS(O)2-substituted alkyl, —NRS(O)2-cycloalkyl, —NRS(O)2-substituted cycloalkyl, —NRS(O)2-aryl, —NRS(O)2-substituted aryl, —NRS(O)2-heteroaryl, —NRS(O)2-substituted heteroaryl, —NRS(O)2-heterocyclic, —NRS(O)2-substituted heterocyclic, —NRS(O)2—NR-alkyl, —NRS(O)2—NR-substituted alkyl, —NRS(O)2—NR-cycloalkyl, —NRS(O)2—NR-substituted cycloalkyl, —NRS(O)2—NR-aryl, —NRS(O)2—NR-substituted aryl, —NRS(O)2—NR-heteroaryl, —NRS(O)2—NR-substituted heteroaryl, —NRS(O)2—NR-heterocyclic, —NRS(O)2—NR-substituted heterocyclic where R is hydrogen or alkyl, —S(O)2-alkyl, —S(O)2-substituted alkyl, —S(O)2-aryl, —S(O)2-substituted aryl, —S(O)2-substituted heteroaryl, —S(O)2-substituted heteroaryl, —S(O)2-heterocyclic, —S(O)2-substituted heterocyclic, mono- and di-(substituted alkyl)amino, N,N-(alkyl, substituted alkyl)amino, N,N-(aryl, substituted alkyl)amino, N,N-(substituted aryl, substituted alkyl)amino, N,N-(heteroaryl, substituted alkyl)amino, N,N-(substituted heteroaryl, substituted alkyl)amino, N,N-(heterocyclic, substituted alkyl)amino, N,N-N,N-(substituted heterocyclic, substituted alkyl)amino, mono- and di-(heterocyclic)amino, mono- and di-(substituted heterocyclic)amino N,N-(alkyl, heterocyclic)amino, N,N-(alkyl, substituted heterocyclic)amino, N,N-(aryl, heterocyclic)amino, N,N-(substituted aryl, heterocyclic)amino, N,N-(aryl, substituted heterocyclic)amino, N,N-(substituted aryl, substituted heterocyclic)amino, N,N-(heteroaryl, heterocyclic)amino, N,N-(heteroaryl, substituted heterocyclic)amino, N,N-(substituted heteroaryl, heterocyclic)amino, N,N-(substituted heteroaryl and substituted heterocyclic)amino;
• and
• E. R5 is not —(CH2)x—Ar—R5′″ where Ar is aryl, heteroaryl, substituted aryl or substituted heteroaryl;
• x is an integer of from 1 to 4;
• and R5″′ is a substituent selected from the group consisting of:
• (a) substituted alkylcarbonylamino with the proviso that at least one of the substituents on the substituted alkyl moiety is selected from the group consisting of alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, alkenyl, amino, amidino, alkyl amidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryloxy, substituted aryloxy, cyano, nitro, halogen, hydroxyl, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkyoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)2-alkyl, —OS(O)2-substituted alkyl, —OS(O)2-aryl, —OS(O)2-substituted aryl, —OS(O)2-heteroaryl, —OS(O)2-substituted heteroaryl, —OS(O)2-heterocyclic, —OS(O)2-substituted heterocyclic, —OSO2—NRR, —NRS(O)2-alkyl, —NRS(O)2-substituted alkyl, —NRS(O)2-aryl, —NRS(O)2-substituted aryl, —NRS(O)2-heteroaryl, —NRS(O)2-substituted heteroaryl, —NRS(O)2-heterocyclic, —NRS(O)2-substituted heterocyclic, —NRS(O)2-NR-alkyl, —NRS(O)2—NR-substituted alkyl, —NRS(O)2—NR-aryl, —NRS(O)2—NR-substituted aryl, —NRS(O)2—NR-heteroaryl, —NRS(O)2—NR-substituted heteroaryl, —NRS(O)2—NR-heterocyclic, —NRS(O)2—NR-substituted heterocyclic, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-(substituted aryl)amino, mono- and di-heteroarylamino, mono- and di-(substituted heteroaryl)amino, mono- and di-heterocyclic amino, mono- and di-(substituted heterocyclic) amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic, and substituted heterocyclic, substituted alkyl groups having amino groups blocked by blocking groups and alkyl/substituted alkyl groups substituted with —SO2-alkyl, —SO2-substituted alkyl, —SO2-alkenyl, —SO2-substituted alkenyl, —SO2-cycloalkyl, —SO2-substituted cycloalkyl, —SO2-aryl, —SO2-substituted aryl, —SO2-heteroaryl, —SO2-substituted heteroaryl, —SO2-heterocyclic, —SO2-substituted heterocyclic or —SO2NRR, where R is hydrogen or alkyl;
• (b) alkoxyaryl substituted on the alkoxy moiety with a substituent selected from the group consisting of carboxyl and —COO23 where R23 is alkyl, substituted alkyl, cycloalkyl, aryl, heteroaryl or heterocyclic;
• (c) aryl and heteroaryl;
• (d) —NR′R′ wherein each R′ is independently selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, cycloalkyl, substituted cycloalkyl, heterocyclic and substituted heterocyclic with the proviso that at least one of R′ is substituted alkyl, cycloalkyl, substituted cycloalkyl, heterocyclic and substituted heterocyclic and with the further proviso that when R′ is substituted alkyl at least one of the substituents on the substituted alkyl moiety is selected from the group consisting of alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, alkenyl, amino, amidino, alkyl amidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryloxy, substituted aryloxy, cyano, nitro, halogen, hydroxyl, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkyoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)2-alkyl, —OS(O)2-substituted alkyl, —OS(O)2-aryl, —OS(O)2-substituted aryl, —OS(O)2-heteroaryl, —OS(O)2-substituted heteroaryl, —OS(O)2-heterocyclic, —OS(O)2-substituted heterocyclic, —OSO2—NRR, —NRS(O)2-alkyl, —NRS(O)2-substituted alkyl, —NRS(O)2-aryl, —NRS(O)2-substituted aryl, —NRS(O)2-heteroaryl, —NRS(O)2-substituted heteroaryl, —NRS(O)2-heterocyclic, —NRS(O)2-substituted heterocyclic —NRS(O)2—NR-alkyl, —NRS(O)2—NR-substituted alkyl, —NRS(O)2—NR-aryl, —NRS(O)2—NR-substituted aryl, —NRS(O)2—NR-heteroaryl, —NRS(O)2—NR-substituted heteroaryl, —NRS(O)2—NR-heterocyclic, —NRS(O)2—NR-substituted heterocyclic, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-(substituted aryl)amino, mono- and di-heteroarylamino, mono- and di-(substituted heteroaryl)amino, mono- and di-heterocyclic amino, mono- and di-(substituted heterocyclic) amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic, substituted alkyl groups having amino groups blocked by blocking groups and alkyl/substituted alkyl groups substituted with —SO2-alkyl, —SO2-substituted alkyl, —SO2-alkenyl, —SO2-substituted alkenyl, —SO2-cycloalkyl, —SO2-substituted cycloalkyl, —SO2-aryl, —SO2-substituted aryl, —SO2-heteroaryl, —SO2-substituted heteroaryl, —SO2-heterocyclic, —SO2-substituted heterocyclic or —SO2NRR, where R is hydrogen or alkyl;
• (e) -alkoxy—NR″R″ wherein each R″ is independently selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heteroaryl, substituted heteroaryl, heterocyclic, and substituted heterocyclic with the proviso that when each R″ is substituted alkyl then at least one of the substituents on the substituted alkyl moiety is selected from the group consisting of alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, alkenyl, amino, amidino, alkyl amidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryloxy, substituted aryloxy, cyano, nitro, halogen, hydroxyl, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkyoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)2-alkyl, —OS(O)2-substituted alkyl, —OS(O)2-aryl, —OS(O)2-substituted aryl, —OS(O)2-heteroaryl, —OS(O)2-substituted heteroaryl, —OS(O)2-heterocyclic, —OS(O)2-substituted heterocyclic, —OSO2—NRR, —NRS(O)2-alkyl, —NRS(O)2-substituted alkyl,
• —NRS(O)2-aryl, —NRS(O)2-substituted aryl, —NRS(O)2-heteroaryl, —NRS(O)2-substituted heteroaryl, —NRS(O)2-heterocyclic, —NRS(O)2-substituted heterocyclic, —NRS(O)2—NR-alkyl, —NRS(O)2—NR-substituted alkyl, —NRS(O)2—NR-aryl, —NRS(O)2—NR-substituted aryl, —NRS(O)2—NR-heteroaryl, —NRS(O)2—NR-substituted heteroaryl, —NRS(O)2—NR-heterocyclic, —NRS(O)2—NR-substituted heterocyclic, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-(substituted aryl)amino, mono- and di-heteroarylamino, mono- and di-(substituted heteroaryl)amino, mono- and di-heterocyclic amino, mono- and di-(substituted heterocyclic) amino, and unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic, substituted alkyl groups having amino groups blocked by blocking groups and alkyl/substituted alkyl groups substituted with —SO2-alkyl, —SO2-substituted alkyl, —SO2-alkenyl —SO2-substituted alkenyl, —SO2-cycloalkyl, —SO2-substituted cycloalkyl, —SO2-aryl, —SO2-substituted aryl, —SO2-heteroaryl, —SO2-substituted heteroaryl, —SO2-heterocyclic, —SO2-substituted heterocyclic or —SO2NRR, where R is hydrogen or alkyl;
• (f) substituted alkenyl or substituted alkynyl with the proviso that at least one of the substituents on the substituted alkenyl or substituted alkynyl moiety is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heteroaryl, substituted heteroaryl, heterocyclic, and substituted heterocyclic with the proviso that when substituted with substituted alkyl then at least one of the substituents on the substituted alkyl moiety is selected from the group consisting of alkoxy, substituted alkoxy, acyl, acylamino, thiocarbonylamino, acyloxy, alkenyl, amino, amidino, alkyl amidino, thioamidino, aminoacyl, aminocarbonylamino, aminothiocarbonylamino, aminocarbonyloxy, aryloxy, substituted aryloxy, cyano, nitro, halogen, hydroxyl, carboxyl, carboxylalkyl, carboxyl-substituted alkyl, carboxyl-cycloalkyl, carboxyl-substituted cycloalkyl, carboxylaryl, carboxyl-substituted aryl, carboxylheteroaryl, carboxyl-substituted heteroaryl, carboxylheterocyclic, carboxyl-substituted heterocyclic, cycloalkyl, substituted cycloalkyl, guanidino, guanidinosulfone, thiol, thioalkyl, substituted thioalkyl, thioaryl, substituted thioaryl, thiocycloalkyl, substituted thiocycloalkyl, thioheteroaryl, substituted thioheteroaryl, thioheterocyclic, substituted thioheterocyclic, heterocyclic, substituted heterocyclic, cycloalkoxy, substituted cycloalkyoxy, heteroaryloxy, substituted heteroaryloxy, heterocyclyloxy, substituted heterocyclyloxy, oxycarbonylamino, oxythiocarbonylamino, —OS(O)2-alkyl, —OS(O)2-substituted alkyl, —OS(O)2-aryl, —OS(O)2-substituted aryl, —OS(O)2-heteroaryl, —OS(O)2-substituted heteroaryl, —OS(O)2-heterocyclic, —OS(O)2-substituted heterocyclic, —OSO2-NRR, —NRS(O)2-alkyl, —NRS(O)2-substituted alkyl, —NRS(O)2-aryl, —NRS(O)2-substituted aryl, —NRS(O)2-heteroaryl, —NRS(O)2-substituted heteroaryl, —NRS(O)2heterocyclic, —NRS(O)2substituted heterocyclic, —NRS(O)2—NR-alkyl, —NRS(O)2—NR-substituted alkyl, —NRS(O)2—NR-aryl, —NRS(O)2—NR-substituted aryl, —NRS(O)2—NR-heteroaryl, —NRS(O)2—NR-substituted heteroaryl, —NRS(O)2—NR-heterocyclic, —NRS(O)2—NR-substituted heterocyclic, mono- and di-alkylamino, mono- and di-(substituted alkyl)amino, mono- and di-arylamino, mono- and di-(substituted aryl)amino, mono- and di-heteroarylamino, mono- and di-(substituted heteroaryl)amino, mono- and di-heterocyclic amino, mono- and di-(substituted heterocyclic) amino, unsymmetric di-substituted amines having different substituents selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic, and substituted alkyl groups having amino groups blocked by blocking groups and alkyl/substituted alkyl groups substituted with —SO2-alkyl, —SO2-substituted alkyl, —SO2-alkenyl, —SO2-substituted alkenyl, —SO2-cycloalkyl, —SO2-substituted, cycloalkyl, —SO2-aryl, —SO2-substituted aryl, —SO2-heteroaryl, SO2-substituted heteroaryl, —SO2-heterocyclic, —SO2-substituted heterocyclic or —SO2NRR, where R is hydrogen or alkyl;
• (g) substituted aryloxy and substituted heteroaryloxy with the proviso that at least one substituent on the substituted aryloxy/heteroaryloxy is other than halogen, hydroxyl, amino, nitro, trifluoromethyl, trifluoromethoxy, alkyl, alkenyl, alkynyl, 1,2-dioxymethylene, 1,2-dioxyethylene, alkoxy, alkenoxy, alkynoxy, alkylamino, alkenylamino, alkynylamino, alkylcarbonyloxy, acyl, alkylcarbonylamino, alkoxycarbonylamino, alkylsulfonylamino, N-alkyl or N,N-dialkylurea;
• (h)-alkoxy-saturated heterocyclic, -alkoxy-saturated substituted heterocyclic, -substituted alkoxy-heterocyclic and -substituted alkoxy-substituted saturated heterocyclic;
• (i) —O-heterocyclic and —O-substituted heterocyclic;
• (j) tertrazolyl;
• (k) —NR31-SO2-substituted alkyl where R31 is hydrogen, alkyl or aryl, with the proviso that at least one substituent on the alkyl moiety of the substituted alkylsulfonylamino is other than halogen, hydroxyl, amino, nitro, trifluoromethyl, trifluoromethoxy, alkyl, alkenyl, alkynyl, 1,2-dioxymethylene, 1,2-dioxyethylene, alkoxy, alkenoxy, alkynoxy, alkylamino, alkenylamino, alkynylamino, alkylcarbonyloxy, acyl, alkylcarbonylamino, alkoxycarbonylamino, alkylsulfonylamino, N-alkyl or N,N-dialkylurea;
• (l) alkenylsulfonylamino, alkynylsulfonylamino, substituted alkenylsulfonylamino and substituted alkynylsulfonylamino;
• (m) substituted alkoxy with the proviso that the substitution on the alkyl moiety of said substituted alkoxy does not include alkoxy—NR″R″, as defined above, unsaturated heterocyclyl, alkyloxy, aryloxy, heteroaryloxy, aryl, heteroaryl and aryl/heteroaryl substituted with halogen, hydroxyl, amino, nitro, trifluoromethyl, trifluoromethoxy, alkyl, alkenyl, alkynyl, 1,2-dioxymethylene, 1,2-dioxyethylene, alkoxy, alkenoxy, alkynoxy, alkylamino, alkenylamino, alkynylamino, alkylcarbonyloxy, acyl, alkylcarbonylamino, alkoxycarbonylamino, alkylsulfonylamino, N-alkyl or N,N-dialkylurea;
• (n) amidine and amidine substituted with from 1 to 3 substitutes independently selected from the consisting of alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, heteroaryl and heterocyclic;
• (o) —C(O)NR″′R″′ where each R″′ is independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic with the proviso that when one R″′ is unsaturated heterocyclic, aryl, heteroaryl or aryl/heteroaryl substituted with halogen, hydroxyl, amino, nitro, trifluoromethyl, trifluoromethoxy, alkyl, alkenyl, alkynyl, 1,2-dioxymethylene, 1,2-dioxyethylene, alkoxy, alkenoxy, alkynoxy, alkylamino, alkenylamino, alkynylamino, alkylcarbonyloxy, acyl, alkylcarbonylamino, alkoxycarbonylamino, alkylsulfonylamino, N-alkyl or N,N-dialkylurea, then the other R″′ is alkyl, substituted alkyl (other than unsaturated heterocyclyl substituted-alkyl), cycloalkyl, substituted cycloalkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, heterocyclic or substituted heterocyclic;
• (p) —NR22C(O)—R18 where R18 is selected from the group consisting of alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic, and R22 is alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heteroaryl, substituted heteroaryl, heterocyclic or substituted heterocyclic;
• (q) —SO2-aryl, —SO2-substituted aryl, —SO2-heteroaryl, —SO2-substituted heteroaryl or —SO2-alkyl;
• (r) —RN′C(O)NR19R19 wherein R′ is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic and each R19 is independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic;
• (s) —NR′C(O)OR19 wherein R′ is selected from the group consisting of alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic, and R19 is selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclic and substituted heterocyclic;
• (t) -aminocarbonyl-(N-formylheterocylcyl);
• and
• (u) -alkyl-C(O)NH-heterocyclyl and -alkyl-C(O)NH-substituted heterocyclyl, or pharmaceutically acceptable salt thereof;
• with the following provisos:
• A) when R1 is p-methylphenyl, R2 and R3 together with their pendent nitrogen and carbon atoms form a pyrrolidinyl ring, R5 is p-[-OCH2CH2-(4,5-dihydroimidizol-2-yl), Q is —C(O)NH—, then R6 is not —O—methyl;
• B) when R1 is 4-fluorobenzyl, R2/R3 together equal L-pyrrolidinyl, and R5 is 4-hydroxybenzyl, then R6 is not isopropyl;
• C) when R1 is 1-methylimidazole, R2/R3 together equal L-pyrrolidinyl, and R5 is 4-hydroxybenzyl, then R6 is not t-butyl;
• and
• D) when R1 is 4-trifluoromethoxybenzyl, R2/R3 together equal 5,5-dimethylthiazolidin-4-yl, and R5 is 4-hydroxybenzyl, then R6 is not t-butyl.

A compound selected from the group consisting of:

• N-(Toluene-4-sulfonyl)-L-prolyl-4-(α-methylbenzyloxy)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-propyl-L-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-carboxyphenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-3-(carboxy)phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(2-carboxyphenoxy)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-O-(benzyl)-L-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(iodo)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(methoxy)-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-nitro-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(O-tert-butyl)-L-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(3,4-diiodo)-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(aminobenzoyl)-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(3-iodo-4-hydroxy)-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-chloro)phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-leucine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-alanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(acetamido)-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-isoleucine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-aspartic acid
• N-(Toluene-4-sulfonyl)-L-prolyl-L-lyzine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-glutamic acid
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-dibenzylamino)-phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(N-benzyl)-histidine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-dibenzylamino)-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-methionine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-serine
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyIL-(N-benzyl)-histidine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(1-methyl)histidine
• N-(Toluene-4-sulfonyl)-L-prolyl-D-(N-benzyl)histidine
• N-(Toluene-4-sulfonyl)-L-glutamyl-L-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(N-3-methyl)histidine
• N-(Toluene-4-sulfonyl)-L-prolyl-α-amino-2,3-dihydro-(1,4-benzodioxin)-6-propanoic acid
• N-(Toluene-4-sulfonyl)-L-prolyl-α-amino-1,3-benzodioxole-5-propanoic acid
• N-(Toluene-4-sulfonyl)-L-prolyl-L-valine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-iodo)-phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(aminobenzoyl)phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-chloro)phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-amino)phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-acetamido)phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-L-(N-benzyl)-histidine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(3,3′-tolylureido)-L-phenylalanine
• N-(Toluene-4-sulfonyl-L-prolyl-4-[(2,3,3a,7a-tetrahydro-1H-indole-2-carbonyl)-amino]-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-pentylamino)phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-O-(2-dibenzylamino-ethyl)-tyrosine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-O-[2-(dibenzylamino)ethyl]-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-pentylamino)phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-chlorobenzylamino)-phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[3-(4-cyanophenyl)-ureido]-phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[3-(3-(4-cyanophenyl)-ureido]-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-O-(tert-butoxycarbonylmethyl)-tyrosine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-O-(tert-butoxycarbonylmethyl)-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[(3S)-3,4-dihydro-isoquinolin-3-yl-aminocarbonyl]-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-[3-(3-methoxy-phenyl)-ureido]-L-phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-[3-(3-methoxy-phenyl)-ureido]-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-O-(4,5-dihydro-1H-imidazol-2-yl-methyl)-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(3-propyl-ureido)-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-benzylamino)phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(4-benzylamino)phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(4-chlorobenzylamino)-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl)-L-(4-chloromethanesulfonylamino)-phenylalanine
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-(aminobenzoyl)phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-(benzamido)phenylalanine
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-tyrosine ethyl ester
• N-(Toluene-4-Sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-tyrosine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[(pyridin-4-yl)methylamino]phenylanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[(pyridin-4-yl)methylamino]phenylanine methyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-(pyridin-3-carboxamido)phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-(pyridine-3-carboxamido)phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-[(pyridin-3-ylmethyl)amino]phenylalanine
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-nitrophenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-nitrophenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(2-methoxybenzamido)phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-(4-nitro)phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(2-bromobenzamido)phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-aminophenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-acetamidophenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(2-methoxybenzamido)phenylalanine
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-acetamidophenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-acetamidophenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-acetamidophenylalanine isopropyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-L-4-(isonicotinamido) phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(isonicotinamido)phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-(π-toluene-4-sulfonyl)bistidine methyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-(nicotinamido)phenylalanine ethyl ester
• N-(toluene-4-sulfonyl)-L-prolyl-L-(O-methyl)tyrosine ethyl ester
• N-(α-Toluenesulfonyl)-L-prolyl-L-4-(isonicotinamido)phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(2-bromobenzamido)phenylalanine
• N-(α-Toluenesulfonyl)-L-prolyl-L-4-(isonicotinamido)phenylalanine
• N-(toluene-4-sulfonyl)-L-(1,1-dioxo)thiamorpholyl-L-4-(2-bromodbenzamido))phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-(1,1-dioxo)thiamorpholyl-L-4-(2-bromobenzamido)phenylalanine
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-4-(isonicotinamido)phenylalanine
• N-(α-Toluenesulfonyl)-L-prolyl-L-4-(2-bromobenzamido)phenylalanine ether ester
• N-(Toluene-4-sulfonyl)-L-B)-thiaprolyl-L-tyrosine isopropyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-tyrosine tert-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-tyrosine tert-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(2-trifluoromethylbenzamido)phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(2-methylbenzamido)phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-L-4-(2-trifluoromethylbenzamido) phenylalanine
• N-(4-Fluorobenzenesulfonyl)-L-thiaprolyl-L-tyrosine tert-butyl Ester
• N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)-thiaprolyl-L-tyrosine tert-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(dimethylamino)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-[(2-bromo)benzamido]-L-phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-[(pyrazin-2-yl)C(O)NH]-L-phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(4-nitrobenzoyl)-L-phenylalanine ethyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-4(2-bromobenzamido)-L-phenylalanine t-butyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-4-(2-bromobenzamido)-L-phenylalanine t-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(1-H-2-oxo-3-methyltetrahydropyrimidin-1-yl)-L-phenylalanine t-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(1-H-2-oxo-3-methyltetrahydropyrimidin-1-yl)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-3-chloro-4-(t-butoxy)-L-phenylalanine t-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-3-chloro-4-(hydroxy)-L-phenylalanine t-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4(N,N-dimethylureido)-L-phenylalanine t-butyl ester
• N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-3-chloro-4-hydroxy)-L-phenylalanine t-butyl ester
• N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-3-chloro-4-(hydroxy)-L-phenylalanine isopropyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(2-methoxyphenyl)-L-phenylalanine t-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(2-methoxyphenyl)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-[(5-N,N-dimethyl ureido)-pyridin-2-yl]-alanine
• N-(Toluene-4-sulfonyl)-L-prolyl-[4-(N,N-dimethylsulfamyl)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(N1,N1, N2-trimethylsulfamyl)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-(1-t-butoxycarbonylmethylimidazol-4-yl)-L-alanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-[N,N-dimethylaminocarbonylmethylimidazol-4-yl]-L-alanine methyl ester
• N-[4-(dimethyl ureylenyl)-benzenesulfonyl]-L-prolyl-4-hydroxy-L-phenylalanine isopropyl ester
• N-(Toluene-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-3-chloro-4-hydroxy-L-phenylalanine isopropyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-3-chloro-4-hydroxy-L-phenylalanine isopropyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(carboxymethyl)-L-phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(2-methylbenzamido)-L-phenylalanine methyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(N,N-dimethylaminocarbonylmethyl)-L-phenylalanine
• N-(1-methylimidazol-4-sulfonyl)-L-prolyl-4-hydroxy-L-phenylalanine isopropyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(2,4,5-trioxo-3-phenyltetrahydroimidazol-1-yl)-L-phenylalanine isopropyl ester
• N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-3-fluoro-4-hydroxy-L-phenylalanine isopropyl ester
• N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-3-chloro-4-t-butoxy-L-phenylalanine t-butyl ester
• N-{N-[(1S)-2,10-camphorsultamyl]acetyl}-L-tyrosine t-butyl ester
• N-{N-[(1S)-2,10-camphorsultamyl]acetyl}-3-chlorotyrosine isopropyl ester
• N-(4-Fluorobenzenesulfonyl)-L-thiaprolyl-4-hydroxy-L-phenylalanine t-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(N,N-dimethylaminocarbonylmethyl)-L-phenylalanine t-butyl ester
• N-(4-Nitrobenzenesulfonyl)-L-prolyl-4-(hydroxyl)-L-phenylalanine t-butyl ester
• N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl)thiaprolyl-4-hydroxy-L-phenylalanine isopropyl ester
• N-(4-Fluorobenzenesulfonyl)-L-prolyl-4-hydroxy-L-phenylalanine t-butyl ester
• N-(pyridin-3-sulfonyl)-L-prolyl-4-hydroxy-L-phenylalanine t-butyl ester
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(methanesulfonamido)-L-phenylalanine
• N-(Toluene-4-sulfonyl)-L-prolyl-4-(2,4,5-trioxo-3-(3-chlorophenyl)-tetrahydroimidazol-1-yl)-L-phenylalanine benzyl ester
• N-(1-methylimidazol-4-sulfonyl)-L-(5,5-dimethyl)thiaprolyl-3-chloro-4-hydroxy-L-phenylalanine ethyl ester
• N-(4-Fluorobenzenesulfonyl)-L-(5,5-dimethyl) thiaprolyl-L-3-chloro-4-tert-butoxy-phenylalanine tert-butyl ester, and
• N-[2-(N-2,10-camphorsultamyl) acetyl]-L-3-chloro-4-hydroxyphenylalanine Isopropyl Ester.