Moderate to good yields of 2-substituted 6-cyano-8,9-dimethylpurines 4 have been obtained by reaction of 5-amino-4-(cyanoformimidoyl)-1,2-dimethylimidazole (3) with the carboxylic acid anhydrides, (RCO)2O. The initial products of these reactions are the corresponding 5-carboxamido-4-(cyanoformimidoyl)-1, 2-dimethylimidazoles [5-acylamino-4-(cyanoiminomethyl)-1,2-dimethylimidazoles] 5, which can be isolated when R = CH3 or C2H5. Acyl halides behave in a more complex manner to give mixtures of the starting material and the 5-carboxamido-4-(cyanoformimidoyl)-1,2-dimethylimidazoles as their HCl salts.
通过5-amino-4-(cyanoformimidoyl)-1,2-dimethylimidazole (3) 与
羧酸酸酐 (RCO)2O 的反应,获得了中等至良好的2-取代6-
氰基-8,9-二甲基
嘌呤 4 的产率。这些反应的初始产物是相应的5-羧酰胺-4-(cyanoformimidoyl)-
1,2-二甲基咪唑 [5-酰
氨基-4-(
氰基亚
氨基甲基)-
1,2-二甲基咪唑] 5,当R =
CH3或
C2H5时可以分离出来。
酰卤与之表现出更复杂的行为,生成起始材料和5-羧酰胺-4-(cyanoformimidoyl)-
1,2-二甲基咪唑的混合物,其以HCl盐的形式存在。