Asymmetric epoxidation of α,β-unsaturated aldehydes catalyzed by a spiro-pyrrolidine-derived organocatalyst
摘要:
The asymmetric epoxidation of alpha,beta-unsaturated aldehydes, catalyzed by a spiro-pyrrolidine (SPD)-derived organocatalyst, has been accomplished with good diastereoselectivities (up to dr >20:1) and with high to excellent enantioselectivities (up to 99% ee). (C) 2016 Elsevier Ltd. All rights reserved.
An efficient enantioselective synthesis of the acyl side chain of polyoxypeptins
作者:Dong-Guang Qin、Zhu-Jun Yao
DOI:10.1016/s0040-4039(02)02580-7
日期:2003.1
An enantioselectivesynthesis of the acyl side-chain 3 of polyoxypeptins 1 and 2 was achieved by the Sharpless AE, with subsequent regioselective opening of the epoxyalcohol using a Grignard reagent in the presence of CuI, and an aldol condensation using Seebach's ester. The method reported has the advantage of a concise route and excellent enantiomeric purity, as well as starting from readily available