Enantioselective Nitrile Anion Cyclization to Substituted Pyrrolidines. A Highly Efficient Synthesis of (3<i>S</i>,4<i>R)</i>-N-<i>tert</i>-Butyl-4-Arylpyrrolidine-3-Carboxylic Acid
作者:John Y. L. Chung、Raymond Cvetovich、Joseph Amato、J. Christopher McWilliams、Robert Reamer、Lisa DiMichele
DOI:10.1021/jo050178+
日期:2005.4.1
practical asymmetric synthesis of N-tert-butyl disubstituted pyrrolidines via a nitrile anion cyclization strategy is described. The five-step chromatography-free synthesis of (3S,4R)-1-tert-butyl-4-(2,4-difluorophenyl)pyrrolidine-3-carboxylic acid (2) from 2-chloro-1-(2,4-difluorophenyl)-ethanone achieved a 71% overall yield. The cyclization substrate was prepared via a catalytic CBS asymmetric reduction
Muscarinic Acetylcholine receptor antagonists and methods of using them are provided.
本发明提供了肌肉型乙酰胆碱受体拮抗剂及其使用方法。
10a-Azalide Compound
申请人:Sugimoto Tomohiro
公开号:US20090281292A1
公开(公告)日:2009-11-12
[Object]: To provide a compound having a novel structure effective against
Hemophilus influenzae
and erythromycin resistant bacteria (for example, resistant pneumococci and streptococci) as well as against conventional erythromycin sensitive bacteria.
[Solution]: A novel 10a-azalide compound represented by the formula (I), a pharmaceutically acceptable salt thereof or a solvate thereof, or an intermediate for the preparation of the same. The compound of the present invention has superior antibacterial activity against
Hemophilus influenzae
, erythromycin resistant pneumococci and the like, and therefore, the compound can be used as a therapeutic agent of infectious diseases.