Diastereoselective synthesis of cyclopropanes bearing trifluoromethyl-substituted all-carbon quaternary centers from 2-trifluoromethyl-1,3-enynes beyond fluorine elimination
作者:Shujie Chen、Jinhui Zhang、Mingfeng Yang、Fenggang Liu、Zhipeng Xie、Yunlin Liu、Wenxia Lin、Daru Wang、Xiangrui Li、Jiahai Wang
DOI:10.1039/c9cc00785g
日期:——
Herein, a one-pot, two-step procedure for the diastereoselective synthesis of cyclopropanes bearing trifluoromethyl-substituted all-carbon quaternary centers has been described. Trifluoromethyl-activated 1,3-enynes undergo cyclopropanation reactions with sulfur ylides under mild reaction conditions without fluoride elimination, which affords the cis-isomer mainly. Interestingly, a sequential TBAF-mediated
在此,已经描述了用于一锅两步的非对映选择性合成带有三氟甲基取代的全碳季中心的环丙烷的方法。三氟甲基活化的1,3-烯炔在温和的反应条件下与硫酰化物进行环丙烷化反应,而没有消除氟化物,这主要提供了顺式异构体。有趣的是,连续的TBAF介导的三异丙基甲硅烷基基团的脱保护导致非对映体富集的差向异构化,其产生了作为唯一异构体的反式环丙烷。