Pyrrolidine derivatives and method of synthesizing these
申请人:——
公开号:US20040236118A1
公开(公告)日:2004-11-25
The object of the invention is to provide a process for efficient, inexpensive and stereoselective production of (2S,4S)-2-[[(3R)-pyrrolidin-3-yl-(R)-hydroxylmethyl]pyrrolidin-4-thiol dihydrochloride useful as an intermediate in production of novel carbapenem, and the intermediate is produced via a novel crystallizable intermediate (2S,4R)—N-t-butoxycarbonyl-2-[[(3R)—N-t-butoxycarbonyl pyrrolidin-3-yl-(R)-hydroxylmethyl]-4-hydroxypyrrolidine from a (2S,4R)-4-alkylsilyloxy-N-t-butoxycarbonylpyridine-2-carbaldehyde derivative by aldol reaction using an asymmetric assistant such as amino-alcohol.
PYRROLIDINE DERIVATIVES AND METHOD OF SYNTHESIZING THESE
申请人:Eizai Co., Ltd.
公开号:EP1413574A1
公开(公告)日:2004-04-28
The object of the invention is to provide a process for efficient, inexpensive and stereoselective production of (2S,4S)-2-[[(3R)-pyrrolidin-3-yl-(R)-hydroxy] methyl] pyrrolidin-4-thiol dihydrochloride useful as an intermediate in production of novel carbapenem, and the intermediate is produced via a novel crystallizable intermediate (2S,4R)-N-t-butoxycarbonyl-2-[[(3R)-N-t-butoxycarbonyl pyrrolidin-3-yl-(R)-hydroxy]methyl]-4-hydroxypyrrolidine from a (2S,4R)-4-alkylsilyloxy-N-t-butoxycarbonylpyridine-2-carbal dehyde derivative by aldol reaction using an asymmetric assistant such as amino-alcohol.
Asymmetric Substitutions of 2-Lithiated N-Boc-piperidine and N-Boc-azepine by Dynamic Resolution
作者:Iain Coldham、Sophie Raimbault、David T. E. Whittaker、Praful T. Chovatia、Daniele Leonori、Jignesh J. Patel、Nadeem S. Sheikh
DOI:10.1002/chem.200903059
日期:2010.4.6
(N‐Boc‐piperidine) with sBuLi and TMEDA provides a racemic organolithium that can be resolved using a chiral ligand. The enantiomeric organolithiums can interconvert so that a dynamic resolution occurs. Two mechanisms for promoting enantioselectivity in the products are possible. Slow addition of an electrophile such as trimethylsilylchloride allows dynamic resolution under kinetic control (DKR). This