Ring-Strain-Enabled Catalytic Asymmetric Umpolung C–O Bond-Forming Reactions of 1,2-Oxazetidines for the Synthesis of Functionalized Chiral Ethers
作者:Binyu Wu、Jinggang Yang、Min Gao、Lin Hu
DOI:10.1021/acs.orglett.0c01916
日期:2020.7.17
An unprecedented catalytic asymmetric umpolung C–O bond-forming reaction of N-nosyl 1,2-oxazetidines with β-keto esters has been achieved in the presence of a chiral phase-transfer catalyst, allowing access to a range of highly functionalized chiral ethers bearing quaternary and no adjacent stereogenic centers with high yields, excellent enantioselectivities, and diastereoselectivities (up to 97% ee
在手性相转移催化剂的存在下,N-烷基1,2-氧氮杂环丁烷与β-酮酯的空前催化不对称C-O键形成催化反应已经实现,从而可以使用一系列高度官能化的手性醚具有四元且没有相邻的立体发生中心,具有高产率,出色的对映选择性和非对映选择性(高达97%ee和20:1 dr)。这些多功能产品可以通过两个步骤灵活地转变为生物学上重要的手性融合和螺吗啉。