Dehydroamino acids

A compound of formula:

• wherein R1 is hydrogen and R2 and R3 taken together with the ethenylene group connecting them form phenyl, pyrrole, pyrroline, oxopyrroline, pyrazole, triazole, or imidazole;
• A is
• R4 and R5 are hydrogen, methyl, ethyl or halogen except that R4 and R5 cannot both be hydrogen;
• and
• 1) B is hydrogen, or lower alkyl;
• or
• 2) B is
• where R6 R7 R8 and R9 are independently hydrogen, hydroxy, aminosulfonyl, halogen, lower alkoxy, cyano, amino, lower alkyl, lower alkyl amino, or nitro;
• or
• 3) B is
• where R10 is hydrogen, hydroxy, halogen, or lower alkyl and C is a five- or six-membered ring with 0 to 3 heteroatoms which heteroatoms are selected from nitrogen, oxygen, and sulfur, which ring may be unsubstituted or mono- or di-substituted with lower alkyl, cycloalkyl, amino, or substituted amino;
• or
• 4) B is
• where X and Y are independently methylene or nitrogen;
• or
• 5) B is
• where at least one of T, U, V, or W is nitrogen, and any of T, U, V or W which is carbon may be substituted with lower alkyl, lower alkyl amino, lower alkoxy, hydroxy, aminosulfonyl, halogen, cyano, amino, or nitro;
• or
• 6) B is
• wherein Y is carbon or nitrogen;
• or
• 7) B is a five-membered aromatic ring with 1 to 3 heteroatoms selected from nitrogen, oxygen, and sulfur which ring may be unsubstituted or mono- or di-substituted with lower alkyl, cycloalkyl, trifluoroloweralkyl, amino, halogen, substituted amino, or which ring may be fused with a 5 or 6 membered aromatic ring containing 0 to 3 heteroatoms which heteroatoms are selected from nitrogen, oxygen, and sulfur;
• or pharmaceutically acceptable salts thereof.

A compound of formula:

• wherein R2 and R3 taken together with the ethenylene group connecting them form phenyl, pyrroline, pyrrole, oxopyrroline, pyrazole, triazole, or imidazole;
• R4 and R5 are hydrogen, methyl, ethyl, or halogen except that R4 and R5 cannot both be hydrogen, and
• R6 is
• where R7 is lower alkyl,
• Z is oxygen or NH, R8 is hydrogen or methyl and R9 is lower alkyl or cycloalkyl and m, n, and r are 1 to 5;
• A is
• 1) B is hydrogen, or lower alkyl;
• or
• 2) B is
• where R6 R7 R8 and R9 are independently hydrogen, hydroxy, aminosulfonyl, halogen, lower alkoxy, cyano, amino, lower alkyl, lower alkyl amino, or nitro;
• or
• 3) B is
• where R10 is hydrogen, hydroxy, halogen, or lower alkyl and C is a five- or six-membered ring with 0 to 3 heteroatoms, which heteroatoms are selected from nitrogen, oxygen, and sulfur, which ring may be unsubstituted or mono- or di-substituted with lower alkyl, cycloalkyl, amino, or substituted amino;
• or
• 4) B is
• where X and Y are independently methylene or nitrogen;
• or
• 5) B is
• where at least one of T, U, V, or W is nitrogen, and any of T, U, V or W which is carbon may be substituted with lower alkyl, lower alky amino, lower alkoxy, hydroxy, aminosulfonyl, halogen, cyano, amino, or nitro;
• or
• 6) B is
• wherein Y is carbon or nitrogen;
• or
• 7) B is a five-membered aromatic ring with 1 to 3 heteroatoms selected from nitrogen, oxygen, and sulfur which ring may be unsubstituted or mono- or di-substituted with lower alkyl, cycloalkyl, trifluoroloweralkyl, amino, halogen, substituted amino, or which ring may be fused with a 5 or 6 membered aromatic ring containing 0 to 3 heteroatoms which heteroatoms are selected from nitrogen, oxygen, and sulfur;or pharmaceutically acceptable salts thereof.

A compound of formula:

• wherein R1 is hydrogen, hydroxy, amino or halogen, R2 is hydrogen, hydroxy or halogen and R3 is hydrogen, R4 and R5 are hydrogen, methyl, ethyl, or halogen except that R4 and R5 cannot both be hydrogen, and
• R6′ is
• where R7 is lower alkyl, —(CH2) r—N(CH3)2,
• Z is oxygen or NH, R8′ is hydrogen or methyl and R9 is lower alkyl or cycloalkyl and m, n, and r are 1 to 5;
• A is
• 1) B is hydrogen, or lower alkyl;
• or
• 2) B is
• where R6 R7 R8 and R9 are independently hydrogen, hydroxy, aminosulfonyl, halogen, lower alkoxy, cyano, amino, lower alkyl, lower alkyl amino, or nitro;
• or
• 3) B is
• where R10 is hydrogen, hydroxy, halogen, or lower alkyl and C is a five- or six-membered ring with 0 to 3 heteroatoms, which heteroatoms are selected from nitrogen, oxygen, and sulfur, which ring may be unsubstituted or mono- or di-substituted with lower alkyl, cycloalkyl, amino, or substituted amino;
• or
• 4) B is
• where X and Y are independently methylene or nitrogen;
• or
• 5) B is
• where at least one of T, U, V, or W is nitrogen, and any of T, U, V or W which is carbon may be substituted with lower alkyl, lower alkyl amino, lower alkoxy, hydroxy, aminosulfonyl, halogen, cyano, amino, or nitro;
• or
• 6) B is
• wherein Y is carbon or nitrogen;
• or
• 7) B is a five-membered aromatic ring with 1 to 3 heteroatoms selected from nitrogen, oxygen, and sulfur which ring may be unsubstituted or mono- or di-substituted with lower alkyl, cycloalkyl, trifluoroloweralkyl, amino, halogen, substituted amino, or which ring may be fused with a 5 or 6 membered aromatic ring containing 0 to 3 heteroatoms which heteroatoms are selected from nitrogen, oxygen, and sulfur;
• or pharmaceutically acceptable salts thereof.