| 摘要 |
<p>Sulfonated amino acid derivatives (I), their optical isomers and acid addition salts, are new. Sulfonated amino acid derivatives (I), their optical isomers and acid addition salts, are new. ring A = a 5 membered nitrogen heterocycle that may be substituted by cyano; R1 = H, 1-6C alkyl or acyl, prolyl, alanyl, histidylprolyl, or phenylalanylprolyl; Ak = 1-6C alkylene or heteroalkylene; X = a bond or phenylene optionally substituted by one or more groups selected from halogens, 1-6C alkyl, alkoxy or polyhaloalkyl, or OH; R2 = 1-6C alkyl (optionally substituted by one or more groups selected from aryl, 1-6C alkylsulfonyl, 3-7C cycloalkylsulfonyl, 3-7C cycloalkyl, and halogen), 3-10C cycloalkyl, or a group -NR2aR2b; R2a and R2b = H, 1-6C alkyl, or together with the N atom they form a nitrogen heterocycle; Y = -NR3, -NH-CH=N-, -C(=NH)-NH-, or -NR4-C(=NR5)-NR6-; R3 = H, 1-6C alkyl, 3-7C cycloalkyl, or aryl; R4, R5, R6 = H, 1-6C alkyl; or R4 and R6 together, or R5 and R6 together = imidazolidine or dihydrobenzimidazole in which the term nitrogen heterocycle encompasses a monocyclic saturated ring of 5 - 7 members having 1 - 3 heteroatoms at least one of which is N and others may be N, O or S, and the term 1-6c alkylene encompasses a group that may be straight or branched and one methylene group may be replaced by an atom or O or S.</p> |
