Preparation of enantiomerically pure α-hydroxymethyl S-tert-Butyl sulfones by Candida antarctica lipase catalyzed resolution
作者:Hans-Joachim Gais、Ingo von der Weiden
DOI:10.1016/0957-4166(96)00135-8
日期:1996.5
Candida antarctica lipase (CAL; Novozym 435) catalyzed acylation of racemic methyl and benzyl substituted hydroxy sulfones rac-3a and rac-3d, respectively, with vinyl acetate either neat or in ether solvents proceeded with E-values of 18 and 49. For the CAI, catalyzed hydrolysis of methyl substituted acetoxy sulfone rac-4a in an emulsion of phosphate buffer and methyl tert-butyl ether at pH 7.0 an E-value of 22 was found. Acetate (+)-emt-4a as well as alcohols (-)-3a and (-)-(S)-3d were obtained with ee-values of 99% on a gram scale. Copyright (C) 1996 Elsevier Science Ltd