Site-Selective and Stereoselective C–H Functionalization of N-Cyclopropylamides via a Directed Remote Metalation Strategy
作者:Yuri Ermolovich、Maryia V. Barysevich、Jasper Adamson、Oksana Rogova、Sandra Kaabel、Ivar Järving、Nicholas Gathergood、Victor Snieckus、Dzmitry G. Kananovich
DOI:10.1021/acs.orglett.8b03955
日期:2019.2.15
methodology for site-selective and stereoselective C–H functionalization of aminocyclopropanes via directed remote lithiation has been developed. Treatment of N-directing group (DG = pivaloyl, tetramethylsuccinimidoyl) arylcyclopropanes with t-BuLi results in a clean β-lithiation and, following quench with electrophiles, leads to a range of cyclopropane derivatives. Sequential double lithiation–methylation
已经开发了一种通过定向远程锂化对氨基环丙烷进行位点选择性和立体选择性C–H官能化的新方法。用t -BuLi处理N方向基团(DG =新戊酰基,四甲基琥珀酰亚胺基)芳基环丙烷会产生干净的β-锂化,并在用亲电试剂淬灭后会生成一系列环丙烷衍生物。已经实现了顺序双锂化-甲基化以生成二甲基化的环丙烷。X射线,NMR和计算研究通过DG-锂基配位配合物使顺式-DGβ-去质子化选择性合理化。