[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.
The present invention provides sulfur- or selenium-containing compounds comprising hydrophobic moieties and ethoxylated ester or ethoxylated amide moieties such that the compounds have surfactant properties. Also provided are methods for using the disclosed compounds or mixtures thereof in a variety of applications.
[EN] DEMETHYLATION OF METHYL ESTER OF METHIONINE AND ITS HYDROXY ANALOG<br/>[FR] DÉMÉTHYLATION D'ESTER MÉTHYLIQUE DE MÉTHIONINE ET DE SON ANALOGUE HYDROXY
申请人:HALDOR TOPSOE AS
公开号:WO2019219597A1
公开(公告)日:2019-11-21
The following invention regards a process of demethylating a methyl ester of methionine or its hydroxy analog and producing methane thiol as a side-product. The methionine and its hydroxy analog are suitable as an animal feed additive and as a food additive. The methane thiol may be consumed in a hydrothiolation step such as in a step of preparing the methyl ester of methio- nine or its hydroxy analog from from methyl vinyl glycolate.
Process for optically active 3-(methane-sulfonyloxy) thiolane and analogs
申请人:Pfizer Inc.
公开号:US04954647A1
公开(公告)日:1990-09-04
Intermediates and a stepwise process for the conversion of D-methionine or certain of its derivatives to optically active compounds of the formula ##STR1## wherein R is (C.sub.1 -C.sub.3)alkyl, phenyl or tolyl. The latter compounds are in turn useful as an intermediate in the preparation of penem antibiotic 5R,6S-6-(1R-hydroxyethyl)-2-(1R-oxo-3S-thiolanylthio)-2-penem-3-carboxylic acid and corresponding pharmaceutically acceptable salts and esters.
Process for optically active 3-(methane-sulfonyloxy)thiolane and analogs
申请人:Pfizer Inc.
公开号:US04874877A1
公开(公告)日:1989-10-17
Intermediates and a stepwise process for the conversion of D-methionine or certain of its derivatives to optically active compounds of the formula ##STR1## wherein R is (C.sub.1 -C.sub.3) alkyl, phenyl or tolyl. The latter compounds are in turn useful as an intermediate in the preparation of penem antibiotic 5R,6S-6-(1R-hydroxyethyl)-2-(1R-oxo-3S-thiolanylthio)-2-penem-3-carboxylic acid and corresponding pharmaceutically acceptable salts and esters.