A Convenient Synthesis of Enantiomerically Pure (2<i>R</i>,3<i>S</i>)- and (2<i>S</i>,3<i>R</i>)-3-Hydroxy-2-methylbutanoic Esters
作者:Yves Petit、Caroline Sanner、Marc Larchevêque
DOI:10.1055/s-1988-27629
日期:——
Both enantiomers of erythro methyl or ethyl 3-hydroxy-2-methylbutanoate were prepared by reaction of lithium dimethylcuprate with enantiomerically pure cis-2,3-epoxybutanoic esters derived from L- or D- threonine.
Synthesis of (+)-Hypoxylactone through Allenoate γ-Addition: Revision of Stereochemistry
作者:Gyungah Pak、Euijin Park、Saehansaem Park、Jimin Kim
DOI:10.1021/acs.joc.0c02194
日期:2020.11.6
A synthesis of (+)-hypoxylactone has been accomplished in four steps starting from the allenoate γ-addition of threo-3-chloro-2-silyoxybutanals, leading to the revision of stereochemistry. The key was the discovery of control elements required to matching/mismatching cases in the allenoate γ-addition to provide the desired adducts as a single isomer. The utility of the γ-adduct was demonstrated with