Preparation of Enantiomerically Pure 1,3-Butanediol from Threonine
作者:Marc Larchevêque、Lengo Mambu、Yves Petit
DOI:10.1080/00397919108021588
日期:1991.12
Enantiomerically pure R or S 1,3-butanediols were prepared in four steps from L or D threonine by nitrous deamination in the presence of bromide ion followed by esterification and reduction.
Synthesis of pure methyl [(2S,3R,αR)-1-(3-bromo-4-methoxyphenyl)-3-(α-acetoxy)ethyl-4-oxoazetidin-2-carboxylate] and its enantiomer
Synthesis of key intermediates leading to 2-iso-oxacephems was carried out starting from L- and D-threonine. As predicted in our previous paper (Tetrahedron Lett. 1995, 36, 8303-8306) all diastereomers of 2-iso-oxacephems can be prepared from the appropriate enantiomers of the amino acid threonine. The absolute configuration of the 2,3- and alpha -carbon atoms in the beta -lactam structure was determined by X-ray crystallographic studies. (C) 2001 Elsevier Science Ltd. All rights reserved.
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.