Asymmetric Hydrogenation of Cyclic N-Sulfonylimines with Phosphine-Free Chiral Cationic Ru-MsDPEN Catalysts
作者:Fei Chen、Zhiwei Li、Yanmei He、Qinghua Fan
DOI:10.1002/cjoc.201090260
日期:2010.9
Phosphine‐free chiralcationic Ru/diamine complexes are effective catalysts for the asymmetrichydrogenation of a range of cyclic N‐sulfonylimines, affording chiral sultam derivatives with good to excellent enantioselectivity (up to 94% ee).
Highly Enantioselective Synthesis of Sultams via Pd-Catalyzed Hydrogenation
作者:Chang-Bin Yu、Da-Wei Wang、Yong-Gui Zhou
DOI:10.1021/jo900790k
日期:2009.8.7
Using pd(cf3co2)2/(S,S)-f-Binaphane as the catalyst, an efficient enantioselective synthesis of sultams was developed via asymmetric hydrogenation of the corresponding cyclic imines with high enantioselectivities. The hydrogenation products can be conveniently transformed to chiral homoallylic amines without loss of enantioselectivity.
以pd(cf 3 co 2)2 /(S,S)-f-Binaphane为催化剂,通过高对映选择性的相应环状亚胺的不对称加氢反应,开发了有效的对映异构体。氢化产物可以方便地转化为手性均烯丙基胺,而不会损失对映选择性。
Formal Palladium-Catalyzed Asymmetric Hydrogenolysis of Racemic<i>N</i>-Sulfonyloxaziridines
Highly enantioselective palladium-catalyzed formal hydrogenolysis of racemic N-sulfonyloxaziridines has been realized, providing a novel access to sultams with up to 99% ee. Preliminary mechanistic insights revealed that the reaction proceeded through a N–O bond cleavage, dehydration, and the sequential asymmetric hydrogenation.