Verfahren zur Herstellung der reinen Enantiomere der 4-[4-(4'-tert.Butylphenyl)-2-hydroxybutoxy]-benzoesäure und ihrer Alkylester
申请人:Klinge Pharma GmbH
公开号:EP0518110B1
公开(公告)日:1995-08-09
JPH05155808A
申请人:——
公开号:JPH05155808A
公开(公告)日:1993-06-22
US5266721A
申请人:——
公开号:US5266721A
公开(公告)日:1993-11-30
Process for preparing the pure enantiomers of lifibrol and its alkyl
申请人:Klinge Pharma GmbH
公开号:US05266721A1
公开(公告)日:1993-11-30
The preparation of the pure enantiomers of LIFIBROL and its alkyl esters is achieved with surprisingly good yield by reacting the pure enantiomeric forms of S(-) R(+)-4-(4-tert.butylphenyl)-1,2-epoxy butane with 4-hydroxybenzoic acid alkyl ester at elevated temperature in DMF and in the presence of 4-hydroxybenzoic acid alkyl ester sodium salt. Thereafter, the raw reaction product is separated. Either the stereochemically pure LIFIBROL ester is then recovered by recrystallization or the precipitated LIFIBROL enantiomer is made in pure crystalline form by mild alkaline saponification and subsequent acidification.