[EN] A NOVEL, GREEN AND COST EFFECTIVE PROCESS FOR SYNTHESIS OF TERT-BUTYL (3R,5S)-6-OXO-3,5-DIHYDROXY-3,5-O-ISOPROPYLIDENE-HEXANOATE<br/>[FR] NOUVEAU PROCÉDÉ ÉCOLOGIQUE ET ÉCONOMIQUE POUR LA SYNTHÈSE DE TERT-BUTYL (3R,5S)-6-OXO-3,5-DIHYDROXY-3,5-O-ISOPROPYLIDÈNE-HEXANOATE
申请人:LUPIN LTD
公开号:WO2014203045A1
公开(公告)日:2014-12-24
The present invention provides a process of preparation of an intermediate useful for the preparation of statins more particularly the present invention relates to an eco-friendly and cost effective process for the preparation of tert -butyl (3R,5S)-6-oxo-3,5-dihydroxy- 3,5-O-isopropylidene-hexanoate [I].
[EN] CONTINUOUS PROCESS FOR THE ENANTIOSELECTIVE CATALYTIC HYDROGENATION OF BETA-KETOESTERS<br/>[FR] PROCEDE CONTINU D'HYDROGENATION CATALYTIQUE ENANTIOSELECTIVE DE BETA-CETOESTERS
申请人:PHOENIX CHEMICALS LTD
公开号:WO2003097569A1
公开(公告)日:2003-11-27
The present invention relates to a continuous process for the enantioselective catalytic hydrogenation of β-ketoesters comprising providing a catalytic hydrogenation zone and maintaining it under conditions of temperature and pressure effective for the catalytic hydrogenation of β-ketoesters; continuously supplying to the catalytic hydrogenation zone a substrate comprising a β-ketoester to be hydrogenated, a catalyst effective for enantioselective hydrogenation of the β-ketoester and hydrogen; contacting the substrate, the catalyst and the hydrogen in the hydrogenation zone for a residence time effective for at least partial enantioselective catalytic hydrogenation of the β-ketoester; (d) continuously withdrawing from the hydrogenation zone a reaction product mixture comprising enantioselectively hydrogenated β-ketoester, unreacted β-ketoester, catalyst and hydrogen; (e) supplying the reaction product mixture to a separation zone and separating at least some of the enantioselectively hydrogenated β-ketoester from the reaction product mixture; (f) withdrawing the separated enantioselectively hydrogenated β-ketoester as product; and (g) optionally supplying at least part of the remaining material from the separation zone to the hydrogenation zone.
[EN] PREPARATION OF 3,5-DIOXO HEXANOATE ESTER IN TWO STEPS<br/>[FR] PRÉPARATION D'ESTER DE 3,5-DIOXO-HEXANOATE EN DEUX ÉTAPES
申请人:LONZA AG
公开号:WO2012130919A1
公开(公告)日:2012-10-04
The invention discloses a method for the preparation of tert-butyl 6-chloro-3,5- dioxohexanoate from Meldrum's acid derivative and its use for the preparation of tert-butyl (4R,6S)-(6-hydroxymethyl-2,2-dimethyl-1,3-dioxan-4-yl)acetate(BHA), Rosuvastatin and Atorvastatin.
Continuous process for the enantioselective catalytic hydrogenation of beta-ketoesters
申请人:Proctor David Lee
公开号:US20050154225A1
公开(公告)日:2005-07-14
The present invention relates to a continuous process for the enantioselective catalytic hydrogenation of β-ketoesters comprising providing a catalytic hydrogenation zone and maintaining it under conditions of temperature and pressure effective for the catalytic hydrogenation of β-ketoesters; continuously supplying to the catalytic hydrogenation zone a substrate comprising a β-ketoester to be hydrogenated, a catalyst effective for enantioselective hydrogenation of the β-ketoester and hydrogen; contacting the substrate, the catalyst and the hydrogen in the hydrogenation zone for a residence time effective for at least partial enantioselective catalytic hydrogenation of the β-ketoester; (d) continuously withdrawing from the hydrogenation zone a reaction product mixture comprising enantioselectively hydrogenated β-ketoester, unreacted β-ketoester, catalyst and hydrogen; (e) supplying the reaction product mixture to a separation zone and separating at least some of the enantioselectively hydrogenated β-ketoester from the reaction product mixture; (f) withdrawing the separated enantioselectively hydrogenated β-ketoester as product; and (g) optionally supplying at least part of the remaining material from the separation zone to the hydrogenation zone.
Catalytic composition and process for asymmetric hydrogenation
申请人:Proctor David Lee
公开号:US20070173660A1
公开(公告)日:2007-07-26
The present invention concerns a catalytic composition comprising a catalyst effective for catalysing asymmetric hydrogenation reactions, which catalyst requires acid activation, an acidic material effective for activating the catalyst, and a buffering compound or composition capable of forming, in the presence of the acidic material, an acetal, a ketal, a hemiacetal, and/or a hemiketal. The invention also relates to an asymmetric hydrogenation process utilising such a catalytic composition, and to the use of such a catalytic composition for improving the enantiomeric excess of a desired asymmetrically hydrogenated product.