Kinetic Resolution of Phosphines and Phosphine Oxides with Phosphorus Stereocenters by Hydrolases
摘要:
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.
Kinetic Resolution of Phosphines and Phosphine Oxides with Phosphorus Stereocenters by Hydrolases
摘要:
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.
[EN] METHOD FOR INCREASING THE ENANTIOMERIC EXCESS OF CHIRAL PHOSPHINE OXIDES, SULPHIDES, IMIDES AND BORANES<br/>[FR] PROCÉDÉ POUR AUGMENTER L'EXCÈS ÉNANTIOMÉRIQUE DES OXYDES, DES SULFURES, ET DES IMIDES DE PHOSPHINE AINSI QUE DES PHOSPHINE-BORANES CHIRAUX
申请人:CELTIC CATALYSTS LTD
公开号:WO2010004278A1
公开(公告)日:2010-01-14
The present invention relates to a method for increasing the enantiomeric excess of a chiral phosphine oxide, a chiral phosphine sulphide, a chiral phosphine-borane and a chiral phosphine imide said method comprising the steps of: (a) contacting said chiral phosphine oxide, sulphide, imide or borane with a solvent to form a slurry; (b) partitioning the phosphine oxide, sulphide, imide or borane either into the solvent or as an insoluble product; and (c) optionally, isolating the partitioned phosphine oxide, sulphide, imide or borane.
A Simple Resolution Procedure Using the Staudinger Reaction for the Preparation of <i>P</i>-Stereogenic Phosphine Oxides
作者:Neil G. Andersen、Philip D. Ramsden、Daqing Che、Masood Parvez、Brian A. Keay
DOI:10.1021/jo015909u
日期:2001.11.1
(+/-)-P-stereogenic phosphines is achieved by exploiting the Staudinger reaction of a (+/-)-phosphine with enantiopure (1S,2R)-O-(tert-butyldimethylsilyl)isobornyl-10-sulfonyl azide. The resulting mixtures of diastereomeric phosphinimines are generally separable by fractional crystallization or flash chromatography. Subsequent acid-catalyzed hydrolysis provides the corresponding optically pure phosphine oxides