Construction of the Tetracyclic Core of Calyciphylline B-Type <i>Daphniphyllum</i> Alkaloids
作者:Chenglong Du、Jing Fang、Jinyan Chen、Zaimin Liu、Huilin Li、Xiaolei Wang、Xingang Xie、Xuegong She
DOI:10.1021/acs.orglett.9b03322
日期:2019.11.1
A double cyclization strategy was developed to construct the common tetracyclic core of calyciphylline B-type alkaloids. Key features of the synthesis included asymmetric Evans alkylation, ring-closing metathesis reaction, intermolecular amidation, intramolecular aza-Michael addition, and aldol condensation reactions. This strategy may be applied to the total syntheses of this type of natural product