Kinetic Resolution of Phosphines and Phosphine Oxides with Phosphorus Stereocenters by Hydrolases
作者:Alessio N. Serreqi、Romas J. Kazlauskas
DOI:10.1021/jo00104a015
日期:1994.12
Lipase from Candida rugosa (CRL) and cholesterol esterase (CE) catalyzed the enantioselective hydrolysis of pendant acetates in chiral phosphines and phosphine oxides. The enantioselectivity for most substrates was modest (E = 1.5-4.8), but both hydrolases showed high enantioselectivity for one substrate, ArPhMeP=O (Ar = 1-(2-acetoxy)naphthyl, 4c), E = 81 (CRL) and 32 (GE). Preparative-scale resolution of (+/-)-4c (1.0 g) catalyzed by CRL yielded enantiomerically-enriched starting acetate, (S)-(+)-4c, 0.48 g, 90% ee as well as product alcohol, (R)(-)-4b (Ar = 1-(2-hydroxy)naphthyl), 0.39 g, 88% se. Recrystallization of 4b from toluene raised the enantiomeric purity to >95% ee. Standard chemical steps followed by stereospecific reduction gave both enantiomers of phosphine ArPhMeP (Ar = 1-(2-methoxy)naphthyl) with 96-97% ee. This phosphine is an analog of PAMP (Ar = 2-methoxyphenyl), a chiral phosphine used in asymmetric synthesis.