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 catalyticasymmetric 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
Catalytic enantioselective epoxidation of nitroalkenes
作者:A. Vidal-Albalat、K. Świderek、J. Izquierdo、S. Rodríguez、V. Moliner、F. V. González
DOI:10.1039/c6cc03539f
日期:——
Nitroepoxides are potentially exploitable as synthons with vicinal electrophilic centers. Nevertheless, although advances have been made in the field, enantioselective epoxidation of nitroalkenes is still a challenging process. Herein we...