Co<sub>2</sub>(CO)<sub>8</sub>-Catalyzed Intramolecular Hetero-Pauson−Khand Reaction of Alkynecarbodiimide: Synthesis of (±)-Physostigmine
作者:Chisato Mukai、Tatsunori Yoshida、Mao Sorimachi、Akira Odani
DOI:10.1021/ol052562z
日期:2006.1.1
Herein we describe a novel CO2(CO)(8)-catalyzed intramolecular aza-Pauson-Khand-type reaction of alkynecarbodiimide derivatives affords pyrrolo[2,3-b]indol-2-one ring systems in reasonable yields. This is the first reported CO2(CO)(8) Successfully applied in the hetero-Pauson-Khand reaction. Significantly, the transformation of one of our pyrrolo[2,3-b]indol-2-one derivatives into the indole alkaloid, (+/-)-physostigmine, was completed in a highly stereoselective manner.