Process for preparation of oxyglutaric acid ester derivatives
申请人:Ube Industries, Ltd.
公开号:US05717124A1
公开(公告)日:1998-02-10
A process for preparing an oxyglutaric acid ester derivative of the formula: ##STR1## in which each of R.sup.1 and R.sup.2 is C.sub.1-5 alkoxy, C.sub.1-7 aralkyloxy, C.sub.7-9 halogenated aralkyloxy or phenyl, R.sup.4 is a hydroxyl-protecting group, and R.sup.5 is C.sub.1-10 alkyl which may have a substituent, comprises the steps of reacting a methyl phosphonate derivative or methyl phosphine oxide derivative with an oxyglutaric acid mono-ester to give a reaction product which comprises an oxyglutaric acid derivative having a phosphorus-containing group and a pentenedioic acid mono-ester (by-product), removing the pendenedioic acid mono-ester from the reaction product to isolate the oxyglutaric acid derivative, and converting the isolated oxyglutaric acid derivative into the oxyglutaric acid ester derivative. A process for obtaining an optically active oxyglutaric acid ester derivative is also disclosed.
[EN] PROCESS AND INTERMEDIATES FOR THE SELECTIVE SYNTHESIS OF FLUVASTATIN<br/>[FR] PROCÉDÉ ET INTERMÉDIAIRES POUR LA SYNTHÈSE SÉLECTIVE DE LA FLUVASTATINE
申请人:ZHEJIANG HISUN PHARMACEUTICAL
公开号:WO2006021326A1
公开(公告)日:2006-03-02
The invention relates to process for the selective preparation of 3-hydroxy-6-dialkoxyphosphoryl-5-oxo-hexanoic acid esters, comprising a first step, in which a methylphosphonic acid dialkylester is treated with a base, and a second step, in which the product of the primary reaction is reacted with an optionally 3-protected 3-hydroxy-1,5-pentanoic diacid ester.
Diastereoseletive Transannular Oxa-Conjugate Addition Generates the 2,6-<i>cis</i>-Disubstituted Tetrahydropyran of Neopeltolide
作者:Taylor P. A. Hari、Burkardt I. Wilke、James A. Davey、Christopher N. Boddy
DOI:10.1021/acs.joc.5b02014
日期:2016.1.15
Michael acceptor. Our data indicates that oxa-conjugate addition is reversible and that the stereochemical outcome can be under thermodynamic control. Using computational chemistry, we show that the lowest energy diastereomer is the desired cis-pyran found in neopeltolide, and we experimentally demonstrate that the trans and cis diastereomers are interconvertible under reaction conditions with the cis-pyran