Phase-Transfer-Catalyzed Asymmetric Annulations of Alkyl Dihalides with Oxindoles: Unified Access to Chiral Spirocarbocyclic Oxindoles
作者:Min Gao、Yongyi Li、Xuemin Li、Lin Hu
DOI:10.1021/acs.orglett.1c04174
日期:2022.1.28
A general phase-transfer-catalyzed asymmetric (n+1) (n = 4 or 5) annulation reaction, featuring the direct coupling of simple oxindoles with alkyl dihalides that are allylic/benzylic and non-allylic/benzylic, has been developed to provide previously inaccessible cyclopentane- and cyclohexane-fused spirooxindole scaffolds with high yields and enantioselectivities (88–95% ee). Along with a broad scope
已开发出一种通用的相转移催化不对称 ( n +1) ( n = 4 或 5) 环化反应,其特点是简单的羟吲哚与烯丙基/苄基和非烯丙基/苄基的烷基二卤化物直接偶联,以提供以前无法获得的环戊烷和环己烷融合的螺氧吲哚支架具有高产率和对映选择性(88-95% ee)。除了广泛的范围和温和的条件外,新协议还可以对药物 ubrogepant 的核心进行两步和克级合成。