2,6-Dimethyl-3-methoxycarbonyl-4-(2-nitrophenyl)-1,4-dihydropyridin-5-carbonsaeurebenzylester 、 N,N-dimethylformamide ethanol 、 乙醇 以Analogously to Example 1 heating a solution of 75 mmols of 2'-nitrobenzylideneacetoacetic acid methyl ester and 75 mmols of β-methylaminocrotonic acid benzyl ester in 120 ml of ethanol gave 1,2,6-trimethyl-3-methoxycarbonyl-4-(2'-nitrophenyl)-1,4-dihydropyridine-5-carboxylic acid benzyl ester of melting point 182° C (from ethanol/dimethylformamide)的产率得到2'-Nitrobenzylideneacetoacetic acid methyl ester