Directed Fischer Indolization as an Approach to the Total Syntheses of (+)-Aspidospermidine and (−)-Tabersonine
作者:Joo-Young Kim、Chang-Heon Suhl、Joon-Ho Lee、Cheon-Gyu Cho
DOI:10.1021/acs.orglett.7b03078
日期:2017.11.17
A conceptually new syntheticapproach that provides general access to the aspidosperma alkaloids (+)-aspidospermidine and (−)-tabersonine was developed. This method is based on the regioselective indolization of an ene–hydrazide, which was obtained via a base-catalyzed intramolecular aza-Michael reaction, in situ trapping of the resulting enolate, and subsequent C–N coupling with phenyl hydrazide.