Facile Synthesis of Fully Substituted Dihydro-β-carbolines via Brønsted Acid Promoted Cascade Reactions of α-Indolyl Propargylic Alcohols with Nitrones
作者:Lu Wang、Xin Xie、Yuanhong Liu
DOI:10.1021/ol302695p
日期:2012.12.7
Brønsted acid promoted cyclizations of α-indolyl propargylic alcohols with nitrones is described. The use of nitrones bearing alkenyl or electron-rich aryl groups as the R4 substituent dramatically switches the reaction pathway to afford tetrasubstituted alkenes and amines, which is assumed to proceed through a rearrangement reaction involving N–O bond cleavage and 1,2-migration of the R4 group to an adjacent