1,4-dihydropyridine derivatives, process for preparation thereof and pharmaceutical composition of the same

Abstract From the Canadian patent

New 1,4-dihydropyridine derivatives and their process of preparation are provided of the formula:wherein R1 is aryl which may have one or more suitable substituent(s) or, a heterocyclic group, R2 and R3 are each same or different, esterified, carboxy and, R4 and R5 are each hydrogen; cyano; lower alkyl; or substituted lower alkyl in which the substituent is cyano, hydroxy, acyloxy, hydroxyimino hydra-, zono, lower alkoxyimino, hydroxy(lower)-alkylimino N'-or N', N'-di-(lower)alkylamino-(lower)alkylimino hydrazino, hydroxy(lower)-alkylamino, N'-or N' N'-, di(lower)alkylamino-(lower)alkylamino a 5 or 6-, membered saturated N-containing heterocyclic-1-yl which may have hydroxy, lower alkyl or …