Sequence‐Dependent Stereodivergent Allylic Alkylation/Fluorination of Acyclic Ketones
作者:Xi‐Jia Liu、Shicheng Jin、Wen‐Yun Zhang、Qiang‐Qiang Liu、Chao Zheng、Shu‐Li You
DOI:10.1002/anie.201912882
日期:2020.1.27
The stereodivergent iridium-catalyzed allylic alkylation and fluorination of acyclic ketones is described. α-Pyridyl-α-fluoroketones with vicinal tertiary and quaternary stereocenters were obtained in moderate to excellent yields and stereoselectivities. Distinct from known stereodivergent synthesis, for which two different chiral catalysts are required in general, herein we report a sequence-dependent
描述了立体发散的铱催化的烯丙基烷基化和无环酮的氟化。获得具有邻近的叔和四级立体中心的α-吡啶基-α-氟代酮,具有中等至极好的收率和立体选择性。与通常需要两种不同的手性催化剂的已知立体发散性合成不同,本文中我们报道了序列依赖性立体发散性合成。仅使用一种手性Ir催化剂,通过简单地调节不对称烯丙基烷基化和氟化的顺序并改变Ir催化剂的绝对构型,就可以从相同的起始原料制备产物的所有四种可能的立体异构体。