Method for Highly Enantioselective Ligation of Two Chiral C(sp3) Stereocenters
摘要:
A method is described for the joining of two alpha-lithiated C(sp(3)) stereocenters efficiently and with retention of configuration. The key step involves the effective removal of two electrons from a chiral organocuprate R2CuLi, by i-propyl 2,4-dinitrobenzoate to form a Cu(III) complex that undergoes at -90 degrees C accelerated reductive elimination enantioselectively and exclusively without the formation of free radicals.
Highly Effective Asymmetric Hydrogenation of Cyclic <i>N</i>-Alkyl Imines with Chiral Cationic Ru-MsDPEN Catalysts
作者:Fei Chen、Ziyuan Ding、Jie Qin、Tianli Wang、Yanmei He、Qing-Hua Fan
DOI:10.1021/ol201679f
日期:2011.8.19
A range of cyclic N-alkyl imines were efficiently hydrogenated by using a chiralcationic Ru(η6-cymene)(MsDPEN)(BArF) complex (MsDPEN = N-(methanesulfonyl)-1,2-diphenylethylenediamine) in high yields and up to 98% ee. A one-pot synthesis of chiral 2-phenylpyrrolidine via reductive amination was also developed.
[EN] HCV INHIBITORS, PREPARATION METHOD AND USE THEREOF<br/>[FR] INHIBITEURS DU VHC, LEUR PROCÉDÉ DE PRÉPARATION ET LEUR UTILISATION<br/>[ZH] HCV抑制剂、其制备方法与应用