In the presence of lipase from the yeast Candida cylindracea, partial acetylation of (+/-)-2-[6-benzyloxy-2,5,7,8-tetramethylchroman-2-yl]ethanol with vinyl acetate gives S-(+)-acetate whose alkaline hydrolysis affords (S)-(-)-alcohol. Repeated enzymatic acetylation of the "residual" alcohol up to similar to39% conversion afforded the R-enantiomer. The enantiomeric alcohols were oxidized to (S)- or (R)-aldehydes having the same sign of \alpha\(D) as the original alcohols. These alcohols were converted into S-(+)- and R-(-)-enantiomers of the antioxidant MDL-73404, a hydrophilic analog of alpha-tocopherol.
A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.
从甲基丙烯醛或β-羟基异丁酸中合成光学活性或外消旋形式的维生素E,包括在这个合成中的中间体。
Intermediates in the synthesis of vitamin E
申请人:Hoffmann-La Roche Inc.
公开号:US04051153A1
公开(公告)日:1977-09-27
A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.