[EN] CHIRAL ORGANOSILICON HYDRIDES<br/>[FR] HYDRURES DE COMPOSES ORGANOSILICIUM CHIRAUX
申请人:CHIROGEN PTY LTD
公开号:WO2004018487A1
公开(公告)日:2004-03-04
The invention provides a method for enantioselectively reducing a prochiral carbon centred radical having one or more electron donor groups attached directly to the central prochiral carbon atom of the radical, and/or attached to a carbon atom within 1 to 4 atoms of the central prochiral carbon atom, comprising treating said radical with an activated chiral non-racemic organosilicon hydride in the presence of a Lewis acid. The invention also provides a novel class of activated chiral non-racemic organosilicon hydrides.
[EN] ORGANOGERMANIUM COMPOUNDS AND METHODS FOR THEIR USE<br/>[FR] COMPOSES D'ORGANOGERMANIUM ET PROCEDES D'UTILISATION DE CES COMPOSES
申请人:CHIROGEN PTY LTD
公开号:WO2004011473A1
公开(公告)日:2004-02-05
The invention provides a method for enantioselectively reducing a prochiral carbon centred radical having one or more electron donor groups attached directly to the central prochiral carbon atom of the radical, and/or attached to a carbon atom within 1 to 4 atoms of the central prochiral carbon atom, comprising treating said radical with a chiral non-racemic organogermanium hydride in the presence of a Lewis acid. The invention also provides a novel class of chiral non-racemic organogermanium hydrides and a method of preparing chiral non-racemic organogermanium compounds.
Chemoenzymatic synthesis of pure enantiomeric 2-aryl propionic acids.
作者:Mariano García、Carmen del Campo、Emilio F. lama、José M. Sánchez-Montero、José V. Sinisterra
DOI:10.1016/s0040-4020(01)81926-8
日期:1993.1
A new chemoenzymatic procedure to obtain pure enantiomeric 2-arylpropionic acids is described. The one pot synthesis of (±)-2-arylpropionic acids is carried out by addition of dichlorocarbene to the O bond of arylmethylketones and hydrogenolysis of the addition product. The racemic mixture is resolved by enantiospecific hydrolysis of the racemic ethyl esters using native lipase from Candida rugosa
[EN] METHOD OF REMOVING ORGANOTIN RESIDUE<br/>[FR] PROCEDE POUR ELIMINER UN RESIDU D'ORGANOTINE
申请人:CHIROGEN PTY LTD
公开号:WO2004065334A1
公开(公告)日:2004-08-05
The invention provides a method of separating soluble organotin residue from a reduced product of a reduction reaction that uses an organotin hydride as a reducing agent, the method comprising: (i) contacting a reaction medium comprising said reduced product and soluble organotin residue with a substrate which, (a) is substantially insoluble in the reaction medium, (b) binds at least a portion of said soluble organotin residue, and (c) does not substantially bind the reduced product; (ii) separating said substrate from the reaction medium, thereby removing said at least a portion of organotin residue from the reaction medium; andrecovering the reaction medium comprising the reduced product. The invention also provides a method of performing a reduction reaction using an organotin hydride as a reducing agent that incorporates the method of separating soluble organotin residue.
Enzymatic Hydrolytic Resolution of Racemic Ibuprofen Ethyl Ester Using an Ionic Liquid as Cosolvent
作者:Tao Wei、Kunpeng Yang、Bing Bai、Jie Zang、Xuan Yu、Duobin Mao
DOI:10.3390/molecules21070905
日期:——
The aim of this study was to develop an ionic liquid (IL) system for the enzymaticresolution of racemic ibuprofen ethyl ester to produce (S)-ibuprofen. Nineteen ILs were selected for use in buffer systems to investigate the effects of ILs as cosolvents for the production of (S)-ibuprofen using thermostable esterase (EST10) from Thermotoga maritima. Analysis of the catalytic efficiency and conformation