Alpha-amino acid derivatives, process for their preparation and their use as dipeptidyl peptidase IV inhibitors (DPP IV)

摘要

Alpha amino acid derivatives (I), their optical isomers and addition salts, are new. Alpha amino acid derivatives of formula (I), their optical isomers and addition salts, are new: A = five-membered heterocycle, optionally substituted by a cyano group; Ak = 1-6C alkylene; X = single bond or phenylene; R1, R2, R4 = H or 1-6C alkyl; Y = NR4 or CH-NO2; R3 = NO2 or CN; and provided that: (i) when Y is CH-NO2, then R3 may further be 1-6C alkyl; and (ii) when A is unsubstituted, then Ak is propylene, X is a bond, Y is NH and R3 is NO2, are excluded.