Synthesis of 6-Cyanopurines from 5-Amino-4-(cyanoformimidoyl)-1,2-dimethylimidazole
作者:Brian L. Booth、Ronald D. Coster、M. Fernanda J.r.p. Proença
DOI:10.1055/s-1988-27585
日期:——
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。