[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.
[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.
[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] ENANTIOSELECTIVE REDUCTION METHOD<br/>[FR] PROCEDE DE REDUCTION ENANTIOSELECTIVE
申请人:CHIROGEN PTY LTD
公开号:WO2004065335A1
公开(公告)日:2004-08-05
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 of the radical, said method comprising generating said radical from a radical precursor compound and reacting said radical with a chiral non-racemic organotin hydride in the presence of a Lewis acid and a co-reducing agent, wherein said co-reducing agent is capable of regenerating chiral non-racemic organotin hydride without substantially reducing said radical or said radical precursor compound.