Regiospecificity in Ligand-Free Pd-Catalyzed C–H Arylation of Indoles: LiHMDS as Base and Transient Directing Group
作者:Yorck Mohr、Marc Renom-Carrasco、Clément Demarcy、Elsje Alessandra Quadrelli、Clément Camp、Florian M. Wisser、Eric Clot、Chloé Thieuleux、Jérôme Canivet
DOI:10.1021/acscatal.9b04864
日期:2020.2.21
catalyst–base pair for the C–H arylation of free (NH)-indoles in the C-3 position is reported. Ligand-free palladium acetate coupled with lithium hexamethyldisilazide (LiHMDS) catalyzed the regiospecific, i.e. 100% regioselective, C-3 arylation of indoles with high turnover numbers. This catalytic system has been successfully applied to a wide range of substrates, including various functional aryl halides and
据报道,在C-3位的游离(NH)吲哚的CH芳基化反应的高效催化剂-碱对。不含配体的乙酸钯与六甲基二硅叠氮化锂(LiHMDS)共同催化具有高周转率的吲哚的区域特异性,即100%区域选择性C-3芳构化。该催化体系已成功应用于多种底物,包括各种功能性的芳基卤化物和吲哚核。LiHMDS作为基础和意外瞬态引导基团的独特作用已通过实验揭示,并通过Heck型插入消除机制进行了计算阐明。