Process for the preparation of 3-pyrrolidinols and intermediates therefor
申请人:Kanegafuchi Chemical Industry Co., Ltd.
公开号:US05179212A1
公开(公告)日:1993-01-12
3-Pyrrolidinol or its salt is economically produced by cyclizing an aminobutanol derivative of the formula: ##STR1## wherein R is an alkyl or a substituted or unsubstituted phenyl group, or its salt.
Enantioconvergent chemoenzymatic synthesis of (R)-gamma-amino-beta-hydroxybutyric acid ((R)-GABOB)
申请人:Kamal Ahmed
公开号:US20060141606A1
公开(公告)日:2006-06-29
The present invention particularly relates to a chemoenzymatic process for the stereoselective preparation of both enantiomers of 3-hydroxy-4-trityloxy butanenitrile key intermediates for the preparation of (R)-GABOB by lipase mediated kinetic resolution of its racemates and their effective application in the enantioconvergent synthesis of (R)-GABOB.
Chemoenzymatic Process for the Stereoselective Preparation of (R)-Gamma-Amino-Beta-Hydroxybutyric Acid [(R)-GABOB) and (R)-Carnitine
申请人:Kamal Ahmed
公开号:US20090233337A1
公开(公告)日:2009-09-17
The present invention provides a chemoenzymatic process for the preparation of (R)-GABOB and (R)-carnitine employing lipase-mediated resolution of 3-hydroxy-4-tosyloxybutanenitrile as the key step. The drawing accompanying this specification represents the preparation of racemic 3-hydroxy-4-tosyloxybutanenitrile, its lipase-mediated kinetic resolution and its successful application in the preparation of (R)-GABOB and (R)-carnitine.
Aminobutanol derivative and process for the preparation of 3-pyrrolidinol from the same
申请人:Kanegafuchi Chemical Industry Co., Ltd.
公开号:EP0431521A1
公开(公告)日:1991-06-12
3-Pyrrolidinol or its salt is econimically produced by cyclizing an aminobutanol derivative of the formula:
wherein R is an alkyl or a substituted or unsubstituted phenyl group, or its salt.
3-吡咯烷醇或其盐是通过环化式中的氨基丁醇衍生物经济地生产出来的:
其中 R 是烷基或取代或未取代的苯基,或其盐。
New chemoenzymatic pathway for β-adrenergic blocking agents
The lipase mediated kinetic resolution of pharmaceutically important beta-hydroxy nitrites is described in high enantionteric excesses and good yields. Some of the chiral beta-hydroxy nitriles have been employed in the synthesis of P-adrenergic blocking agents such as propranolol, alprenolol and moprolol. This protocol has also been extended for the enantiopure preparation of 5-(4-tosyloxymethyl)-1,3-oxazolidine-2-one and 3-liydroxy-4-tosyloxybutaiieiiitrile, chiral intermediates of high synthetic value. (c) 2005 Elsevier Ltd. All rights reserved.