Synthesis of 15-azayohimban, a new heterocyclic ring system
作者:Nativitat Vails、Víctor M. Segarra、Maillo Luisa C、Joan Bosch
DOI:10.1016/s0040-4020(01)80944-3
日期:1991.1
Two synthetic routes to the 15-azayohimban ringsystem have been studied. The first one, based on a Pictet-Spengler condensation between tryptamine and piperidine acetal 4, gave very low yields of pentacycles 2a. The second, more efficient route involves as the crucial step a cyclization of a N-acyliminium cation generated from imide 11. The different course of the Pictet-Spengler reaction from amino