Dialkyl 4-aryl-1, 4-dihydro-2, 6-dimethylpyridine-3, 5-dicarboxylates (III) were subjected to the Mannich reaction with excess paraformaldehyde and secondary amine hydrochloride in boiling ethanolic solution. When the compounds III were treated with a 5-to 7-fold molar excess of the aldehyde and amine salt, 2, 6-bis (2-disubstituted aminoethyl)-dihydropyridine derivatives (V) were obtained in good yields. On treatment with a 2- to 3-fold molar excess of the reactants, compounds III were converted to 2-(2-disubstituted aminoethyl)-6-methyldihydropyridine derivatives (IV) and V. When dioxane was used as a solvent with a 6-fold molar excess of the reactants, the tetrakis (dimethylaminomethyl) derivative (VII) was obtained.
二烷基 4-芳基-1, 4-二氢-2, 6-二
甲基吡啶-3, 5-二
羧酸酯 (III) 在沸腾的
乙醇溶液中与过量的多
聚甲醛和二级胺盐酸盐进行曼尼希反应。当化合物 III经5-至7-倍摩尔过量的醛和胺盐处理时,可获得产率良好的 2, 6-双(2-二取代
氨基乙基)-二氢
吡啶衍生物 (V)。用2-至3-倍摩尔过量的反应物处理时,化合物 III 转化成 2-(2-二取代
氨基乙基)-6-甲基二氢
吡啶衍生物 (IV) 和 V。当使用
二氧六环作为溶剂并采用6-倍摩尔过量的反应物时,得到四(
二甲氨基甲基)衍
生物 (VII)。