Asymmetric Synthesis of the Tricyclic Core of <i>Calyciphylline</i> A-Type Alkaloids via Intramolecular [3 + 2] Cycloaddition
作者:Lu Wang、Chen Xu、Li Chen、Xiaojiang Hao、David Zhigang Wang
DOI:10.1021/ol403609c
日期:2014.2.21
Asymmetric synthesis of the [5–6–7] tricyclic system common to the Calyciphylline A-type alkaloids is reported, featuring Overman rearrangement, Heck cyclization, intramolecular [3 + 2] cycloaddition, diastereoselective hydrogenation, and Claisen rearrangement as strategic events. The approach is capable of installing the crucial carbonyl functionality as well as multiple stereogenic centers within
据报道,不对称合成[5–6–7]三环系统是茶碱A型生物碱的主要特征,其特征是超人重排,Heck环化,分子内[3 + 2]环加成,非对映选择性加氢和Claisen重排。该方法能够将关键的羰基官能团以及多个立体异构中心安装在拥挤的多环骨架中。