Process for the enantioselective preparation of pregabalin
申请人:Laboratorios del Dr. Esteve S.A.
公开号:EP2017273A1
公开(公告)日:2009-01-21
The invention provides a new enantioselective process for the preparation of (S)-pregabalin, or a pharmaceutical acceptable addition acid salt comprising: acid hydrolysis of the dioxolan ring of a chiral compound of general formula (I) to obtain compound of general formula (II); oxidation of compound (II) to obtain a compound of general formula (III) and transforming compound (III) into compound of general formula (IV); subjecting compound (IV) to basic hydrolysis to obtain a compound of general formula (V) which is reduced to obtain enantiomerically pure S-pregabalin. The invention also provides new chiral intermediates involved in the process.
PROCESS FOR THE ENANTIOSELECTIVE PREPARATION OF PREGABALIN
申请人:Ortuno Rosa M.
公开号:US20100197939A1
公开(公告)日:2010-08-05
The invention provides a new enantioselective process for the preparation of (S)-pregabalin, or a pharmaceutical acceptable addition acid salt comprising: acid hydrolysis of the dioxolan ring of a chiral compound of general formula (I) to obtain compound of general formula (II); oxidation of compound (II) to obtain a compound of general formula (III) and transforming compound (III) into compound of general formula (IV); subjecting compound (IV) to basic hydrolysis to obtain a compound of general formula (V) which is reduced to obtain enantiomerically pure S-pregabalin. The invention also provides new chiral intermediates involved in the process.
First stereoselective synthesis and assignment of the absolute configuration of the nebracetam eutomer and derivatives
作者:Evanoel C. Lima、Jorge L.O. Domingos、Ayres G. Dias、Paulo R.R. Costa
DOI:10.1016/j.tetasy.2008.04.012
日期:2008.5
(-)-Nebracetam 1 was stereoselectively prepared for the first time, allowing the determination of its absolute configuration as (R). The pivotal intermediate in the synthesis, 1-benzyl-4-[(S)-2,2-dimethyl-1,3-dioxolan-4-yl]-pyrrolidin-2-one 6, was previously obtained in 60% yield and 90% ee from an enoate derived from D-mannitol. Two approaches were investigated to synthesize (R)-(-)nebracetam 1 and analogues 4 and 5 from 6. Compound 6 was transformed into WEB-1868 2. Mesylation of the hydroxyl group in 2, followed by nucleophilic substitution with azide and reduction led to target 1. Compounds 4 and 5 were synthesized by using morpholine and N-methyl piperazine as nucleophiles. Compounds 4 and 5 were also prepared, in higher yields and similar ee, through the reductive amination of aldehyde 10, obtained in two steps from 6. (C) 2008 Elsevier Ltd. All rights reserved.