3-Phenacyl- and 3-alkoxycarbonylmethyl-1-methylimidazolium bromides react with two molecules of diethyl azodicarboxylate in the presence of triethylamine with the extrusion of the imidazole ring and the concomitant migration of an ethoxycarbonyl group to yield 3-substituted tetraethyl 1,2,4,5-tetra-azapent-3-ene-1,1,2,5-tetracarboxylates (5), the structure of which has been confirmed by X-ray crystallography
在
三乙胺存在下,3-苯甲酰基-和3-烷氧基羰基甲基-1-甲基
咪唑鎓
溴化物与两个分子的偶氮二
羧酸二
乙酯反应,同时
咪唑环被挤出,乙氧基羰基随之迁移,生成3-取代的四乙基1,2, (5)4,5-四氮杂五烯-3-烯-1,1,2,5-四
羧酸酯(5),(6)和(7)已经通过X射线晶体学证实。