Process for continuously preparing acetals of alpha, beta-dicarbonyl compounds
申请人:DEGUSSA AG
公开号:US20040186304A1
公开(公告)日:2004-09-23
The present invention relates to a process for preparing acetals of &agr;,&bgr;-dicarbonyl compounds of the general formula
(R″O)
2
CRCR′(OR″)
2
which are obtained by continuous reaction of &agr;,&bgr;-dicarbonyl compounds R—CO—CO—R′ with alcohols R″OH or HO—X—OH in countercurrent.
The process for the synthesis of statins featuring the use of an early intermediate (4R,6S)-6-(dialkoxymethyl)tetrahydro-2H-pyran-2,4-diol which already possesses the desired stereochemistry corresponding to the final statin.
The process for synthesis of statins is presented where the intermediate intermediate (4R,6S)-6-(dialkoxymethyl)tetrahydro-2H-pyran-2,4-diol which already possesses the desired stereochemistry corresponding to final statin is prepared by an aldolaze.