2,6-Dimethyl-3-methoxycarbonyl-4-(2-nitrophenyl)-1,4-dihydropyridin-5-carbonsaeure-(3,4-dichlorbenzyl)ester 、
乙醇 、
丙醇 以Analogously to Example 1 heating a solution of 75 mmols of 2'-nitrobenzylideneacetoacetic acid methyl ester and 75 mmols of β-aminocrotonic acid 3,4-dichlorobenzyl ester in 120 ml of n-propanol gave 2,6-dimethyl-3-methoxycarbonyl-4-(2'-nitrophenyl)-1,4-dihydropyridine-5-carboxylic acid 3,4-dichlorobenzyl ester of melting point 137° C (from ethanol)的产率得到2'-Nitrobenzylideneacetoacetic acid methyl ester