β-aminocrotonic acid 3,4,5-trimethoxybenzyl ester 、 2,6-Dimethyl-3-methoxycarbonyl-4-(2-nitrophenyl)-1,4-dihydropyridin-5-carbonsaeure-(3,4,5-trimethoxybenzyl)ester 以
乙醇 为溶剂,
以Analogously to Example 1 heating a solution of 75 mmols of 2'-nitrobenzylideneacetoacetic acid methyl ester and 75 ml of β-aminocrotonic acid 3,4,5-trimethoxybenzyl ester in 120 ml of ethanol gave 2,6-dimethyl-3-methoxycarbonyl-4-(2'-nitrophenyl)-1,4-dihydropyridine-5-carboxylic acid 3,4,5-trimethoxybenzyl ester of melting point 125° C (from ethanol)的产率得到2'-Nitrobenzylideneacetoacetic acid methyl ester