prepared by reaction of N-vinylic phosphazene 3, obtained from phosphorus ylide 5 and 2-cyanopyridine 4, with aldehydes. Formation of fused heterocycles 1 can be explained through aza-Wittig reaction of phosphazene 3, followed by 1,5-electrocyclic ring closure of the resulting aldimines 2. Phosphazene 3 undergoes pyrido annelation by reaction with Diethyl Ketomalonate to give isoquinoline derivative
咪唑并[1,5-a]吡啶1是通过使由叶立德
磷5和2-
氰基吡啶4获得的N-
乙烯基磷腈3与醛反应制得的。稠合杂环1的形成可以通过
磷腈3的aza-Wittig反应来解释,然后通过1,5-电动环闭合所得醛
亚胺2来解释。
磷腈3通过与酮
戊二酸二乙酯反应而进行
吡啶酮成环,得到
异喹啉衍
生物9。