Kinetic acidity of iminium ions. 2-Alkynyl- and 2,5-dialkynyl-pyrrolidines via the iminium ion route to azomethine ylides
作者:Ronald Grigg、Visuvanathar Sridharan、Mark Thornton-Pett、Jun Wang、Juan Xu、Jin Zhang
DOI:10.1016/s0040-4020(02)00129-1
日期:2002.3
Condensation of carboxaldehydes with appropriate secondary propargylamines furnishes iminium ions which undergo regioselective deprotonation at the propargylic methylene group to generate azomethine ylides. Interception of the latter by N-methyl or N-phenyl maleimide furnishes 2- and 2,5-dialkynyl-pyrrolidines.
羧酸醛与适当的仲炔丙基胺缩合提供了亚胺离子,其在炔丙基亚甲基上进行区域选择性去质子化,从而生成偶氮甲碱。N-甲基或N-苯基马来酰亚胺对后者的拦截提供了2-和2,5-二炔基-吡咯烷。