PROCEDE POUR LA PREPARATION DES ESTERS ASYMETRIQUES D'ACIDE 1,4-DIHYDROPYRIDIN-3,5-DICARBOXYLIQUE N-SUBSTITUE

摘要

Unsymmetrical esters of N-substituted 4-substituted-1,4-dihydropyridine 3,5-dicarboxylic acid optionally substituted by lower alkyl groups in the 2- and 6-positions are cardiovascular agents. The compounds, of which 1,2,6-trimethyl-4-(3'-nitrophenyl)-1,4-dihydropyridine 3,5-dicarboxylic acid 3-methyl-5-ethyl ester is a typical example, can be prepared (A) through condensation of an ylidene- beta -ketocarboxylic acid ester, with a beta -ketocarboxylic acid ester and an amino or salt thereof, or with an enamino carboxylic acid ester or (B) through condensation of an aldehyde, an enamino carboxylic acid ester and a beta -ketocarboxylic acid ester.