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.
Vanadium-Catalyzed Asymmetric Oxidation of Sulfides Using Schiff Base Ligands Derived from β-Amino Alcohols with Two Stereogenic Centers
作者:Yinuo Wu、Juntao Liu、Xingshu Li、Albert S. C. Chan
DOI:10.1002/ejoc.200900289
日期:2009.6
Novel Schiffbase ligands derived from β-amino alcohols with two stereogenic centers were prepared and used in the preparation of optically pure sulfoxides by usingaqueoushydrogenperoxide as the oxidant. A variety of sulfides were smoothly converted into the corresponding sulfoxides catalyzed by the chiral vanadium–Schiff base complex. Good yields (>80 %) with excellent enantioselectivities (>99 % ee)