对甲砜基苯甲醛 、
4-甲氧基乙酰乙酸乙酯 、
3-氨基巴豆酸乙酯 以
乙醇 为溶剂,
以2-methoxymethyl-6-methyl-4-(4'-methylsulphonylphenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid diethyl ester is obtained in the form of yellow crystals of melting point 156°-158°C.的产率得到2-methoxymethyl-6-methyl-4-(4'-methylsulphonylphenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid diethyl ester