2,6-Dimethyl-3-methoxycarbonyl-4-(2-nitrophenyl)-1,4-dihydropyridin-5-carbonsaeure-(3,4-dimethoxybenzyl)ester 以
glycol monomethyl ester 、 甲醇 为溶剂,
反应 5.0h,
以Analogously to Example 1 heating a solution of 65 mmols of 2'-nitrobenzylideneacetoacetic acid methyl ester and 75 mmols of β-aminocrotonic acid 3,4-dimethoxybenzyl ester in 120 ml of glycol monomethyl ester for 5 hours gave 2,6-dimethyl-3-methoxycarbonyl-4-(2'-nitrophenyl)-1,4-dihydropyridine-5-carboxylic acid 3,4-dimethoxybenzyl ester of melting point 149° C (from methanol)的产率得到2'-Nitrobenzylideneacetoacetic acid methyl ester