On the Reaction of (Vinylimino)phosphoranes. Part 17. Preparation of<i>N</i>-Vinylcarbodiimides and Their [4+2] Cycloaddition with Several Dienophiles to Give Pyridine Ring System
作者:Makoto Nitta、Hironobu Soeda、Shinya Koyama、Yukio Iino
DOI:10.1246/bcsj.64.1325
日期:1991.4
derivatives was examined to give N-phenyl-N′-vinylcarbodiimide and its derivatives, all of which underwent a [4+2] cycloaddition reaction with electron-rich dienophiles (enamines) and/or electron-deficient dienophiles (activated acetylenes), resulting in the formation of a pyridine ring system. The regioselectivity of the cycloaddition reaction could be rationalized on the basis of a frontier orbital
研究了(乙烯基亚氨基)三苯基正膦及其几种衍生物的氮杂-维蒂希反应,得到了 N-苯基-N'-乙烯基碳二亚胺及其衍生物,所有这些都与富电子亲二烯体(烯胺)发生了 [4+2] 环加成反应和/或缺电子的亲二烯体(活化的乙炔),导致形成吡啶环系统。环加成反应的区域选择性可以在前沿轨道考虑的基础上合理化。