Catalytic Asymmetric Intramolecular Aminopalladation: Enantioselective Synthesis of Vinyl-Substituted 2-Oxazolidinones, 2-Imidazolidinones, and 2-Pyrrolidinones
作者:Larry E. Overman、Travis P. Remarchuk
DOI:10.1021/ja017198n
日期:2002.1.1
A new catalytic asymmetric synthesis of five-membered nitrogen heterocycles is reported. This synthesis employs ferrocenyloxazoline palladacycles (FOP trifluoroacetate catalysts) 2 and 4 and proceeds by a catalytic cycle involving Pd(II) intermediates. For example, prochiral (Z)-4-acetoxy-2-buten-1-ols are condensed with an arylsulfonyl isocyanate and the derived allylic N-arylsulfonylcarbamates cyclize
Process for preparing 5-vinyl-2-pyrrolidinone and intermediates therefor
申请人:Merrell Dow Pharmaceuticals Inc.
公开号:US04621145A1
公开(公告)日:1986-11-04
4-Amino-5-hexenoic acid is prepared by: (a) reacting 5-oxo-2-pyrrolidine-acetonitrile with hydrogen and dimethylamine in the presence of a palladium catalyst to form N,N-dimethyl-2-[5'-oxo-2'-pyrrolidine]ethylamine; (b) oxidizing N,N-dimethyl-2-[5'-oxo-2'-pyrrolidine]-ethylamine to produce the corresponding N-oxide derivative; (c) pyrolysis of the N-oxide derivative to form 5-vinyl-2-pyrrolidinone; (d) optionally, separating N,N-dimethyl-2-[5'-oxo-2'-pyrrolidine]ethylamine by-product from the 5-vinyl-2-pyrrolidinone product; and (e) hydrolyzing 5-vinyl-2-pyrrolidinone to form 4-amino-5-hexenoic acid.
Treatment of the γ-N-hydroxylamino-α,β-acetylenic esters, obtained by the reaction of nitrones with alkyl 3-lithiopropiolates, with H2 over Raney nickel, followed by in situ protection of the formed amines, gives N-Boc-γ-amino esters. This method has been applied to a synthesis of (S) and (R)-Vigabatrin®.
在雷尼镍上用 H2 处理通过硝基烷基 3-硫代丙酸酯与δ-N-羟基氨基-δ,δ-乙炔酯反应得到的δ-N-羟基氨基-δ,δ-乙炔酯,然后对形成的胺进行原位保护,得到 N-叔丁氧羰基-δ-氨基酯。这种方法已用于合成 (S) 和 (R)-Vigabatrin® 。
Resolution of racemic Vigabatrin using tartaric acid
作者:Kishore Karumanchi、Senthil Kumar Natarajan、Krishna Murthy V. R. Moturu、Ramadas Chavakula、Raghu Babu Korupolu、Kishore Babu Bonige
DOI:10.1080/00397911.2018.1489967
日期:2018.9.2
An efficient and simple resolution methodology for the preparation of (S)- and (R)-Vigabatrin has been developed. In addition, a method of preparation for the novel compounds Vigabatrin-l-tartarate and Vigabatrin-d-tartarate is also described. The title compounds have been synthesized via resolution of Vigabatrin using commercially available l-(+)- and d-(−)-tartaric acids respectively. Graphical Abstract
Scalable Synthesis of Both Enantiomers of Vigabatrin, an Antiepileptic Drug
作者:Gorakhnath R. Jachak、D. Srinivasa Reddy
DOI:10.1002/ejoc.201801617
日期:2019.2.14
A scalable synthesis of bothenantiomers of vigabatrin, a potent inhibitor of gamma‐aminobutyric acid (GABA) catabolism used for the treatment of epilepsy, is presented. Wittig olefination and pyrolytic elimination are the key steps. The target compounds are obtained with >98 % enantiopurity.