[EN] A PROCESS FOR THE PREPARATION OF METHIONINE ALPHA-HYDROXY ANALOGUES FROM SUGARS AND DERIVATIVES THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ANALOGUES D'ALPHA-HYDROXYLATION DE L-MÉTHIONINE À PARTIR DE SUCRES ET DE DÉRIVÉS DE CEUX-CI
申请人:HALDOR TOPSOE AS
公开号:WO2016174231A1
公开(公告)日:2016-11-03
A process for the preparation of methionine a-hydroxy analogue and derivatives thereof comprising contacting one or more sugars or derivatives thereof with a metallo-silicate composition in the presence of a compound comprising sulphur and a solvent.
Convenient synthesis of .alpha.-heterosubstituted acyloxathianes
作者:Xu Bai、Ernest L. Eliel
DOI:10.1021/jo00045a031
日期:1992.9
In contrast to simple esters, alpha-alkoxy, alpha-alkylthio, and alpha-dimethylamino esters react with lithiooxathiane 1-Li in good yield to give the corresponding alpha-functionalized 2-acetylhexahydro-4,4,7-trimethyl-4H-1,3-benzoxathiin 2. In some cases, mixtures of diastereomers (2, 2') are obtained. The reaction has been extended to alpha-methoxy- and alpha-[(triisopropylsilyl)oxy]propanoyl and alpha-(methylthio)butanoyl homologs which have chiral centers at C(alpha).