An improved process for the preparation of cis-1,3-diols is described where a beta hydroxy ketone is treated with a trialkylborane or dialkylalkoxyborane or a mixture of a trialkylborane and a dialkylalkoxyborane followed by recovery and reuse of the alkylborane species to convert additional beta hydroxy ketone to the cis-1,3-diol.
[EN] CONTINUOUS PROCESS FOR THE PRODUCTION OF BETA-KETO ESTERS BY CLAISEN CONDENSATION<br/>[FR] PROCÉDÉ CONTINU POUR LA PRODUCTION DE BÉTÂ-CÉTO ESTERS PAR CONDENSATION DE CLAISEN
申请人:PHOENIX CHEMICALS LTD
公开号:WO2011048425A1
公开(公告)日:2011-04-28
The invention concerns a continuous process for the production of compounds having the general formula (6) comprising providing to a reaction zone a continuous stream of an alkyl acetate and a continuous stream of an alkali metal or alkaline earth metal amide base and contacting the continuous streams together in the reaction zone to yield an enolate compound, providing to the or a separate reaction zone a continuous stream of a compound of formula (5) and contacting the continuous stream of compound (5) with a continuous stream of the enolate in the or the separate reaction zone at a temperature above 20°C to yield an intermediate compound and treating the intermediate compound of formula (1) with an acid to yield the compound of formula (6).
COMPOSITIONS AND METHODS FOR PRODUCING STEREOISOMERICALLY PURE STATINS AND SYNTHETIC INTERMEDIATES THEREFOR
申请人:Giver Lorraine Joan
公开号:US20080248539A1
公开(公告)日:2008-10-09
The present disclosure provides ketoreductase enzymes having improved properties as compared to a naturally occurring wild-type ketoreductase enzyme. Also provided are polynucleotides encoding the engineered ketoreductase enzymes, host cells capable of expressing the engineered ketoreductase enzymes, method of using the engineered ketoreductase enzymes to synthesize a variety of chirally pure compounds, and the chirally pure compounds prepared therewith.