Asymmetric Synthesis of Bioactive Hydrodibenzofuran Alkaloids: (−)-Lycoramine, (−)-Galanthamine, and (+)-Lunarine
作者:Peng Chen、Xu Bao、Le-Fen Zhang、Ming Ding、Xiao-Jie Han、Jing Li、Guo-Biao Zhang、Yong-Qiang Tu、Chun-An Fan
DOI:10.1002/anie.201103198
日期:2011.8.22
Divergent route: A direct CC bond‐forming approach to the key aryl‐substituted all‐carbon quaternary stereogenic center present in bioactive hydrodibenzofuran alkaloids has been discovered. This approach involves an unprecedented organocatalyticenantioselectiveMichaeladdition of α‐cyanoketones with acrylates (see scheme) and was used in a novel and divergent synthetic strategy for the title compounds