Rhodium-catalyzed enantioselective C–H alkynylation of sulfoxides in diverse patterns: desymmetrization, kinetic resolution, and parallel kinetic resolution
作者:Lingheng Kong、Yun Zou、Xiao-Xi Li、Xue-Peng Zhang、Xingwei Li
DOI:10.1039/d2sc05310a
日期:——
Rhodium-catalyzed enantioselective C–H alkynylation of achiral and racemic sulfoxides is disclosed with alkynyl bromide as the alkynylating reagent. A wide range of chiral sulfoxides have been constructed in good yield and excellent enantioselectivity (up to 99% ee, s-factor up to > 500) via desymmetrization, kinetic resolution, and parallel kinetic resolution under mild reaction conditions. The high
公开了用炔基溴作为炔基化试剂的铑催化的非手性和外消旋亚砜的对映选择性 C-H 炔基化。在温和的反应条件下,通过去对称化、动力学拆分和平行动力学拆分,以良好的产率和出色的对映选择性(高达 99% ee, s因子高达 > 500)构建了多种手性亚砜。手性环戊二烯基铑(III) 催化剂与手性甲酰胺添加剂配对。在 C-H 键断裂过程中,手性催化剂、亚砜和手性羧酸酰胺之间的相互作用提供了不对称诱导,这通过 DFT 计算得到了验证。手性甲酰胺作为促进 C-H 活化的碱基,并在 C-H 裂解过程中提供额外的手性环境。