Process for obtaining asymmetric diesters of 4-phenyl-1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxylic disubstituted phenyl the other

摘要

Asymmetric diesters of 4-phenyl 1,4-dihydro 2,6-dimethyl 3,5-pyridine dicarboxylic acid, disubstd. in the phenyl gp. esp. ethyl and methyl esters of 4-(2,3-diamino phenyl) 1,4-dihydro 2,6-dimethyl 3,5-pyridine dicarboxylic acid, are made by (a) converting 2,3-dinitro toluene to 2,3-dinitro benzaldehyde in dimethyl acetal form; (b) reducing this to diamino-benzaldehyde; and (c) carrying out the Hantzsch reaction on this to obtain the desired prod..