Hf(IV)-Catalyzed Enantioselective Epoxidation of <i>N</i>-Alkenyl Sulfonamides and <i>N</i>-Tosyl Imines
作者:José Luis Olivares-Romero、Zhi Li、Hisashi Yamamoto
DOI:10.1021/ja211880s
日期:2012.3.28
Asymmetric epoxidation of allylic and homoallylic amine derivatives catalyzed by Hf(IV)-bishydroxamic acid complexes is described. Under similar conditions, aldimine and ketimine produced oxaziridines. The sulfonyl group is demonstrated to be an effective directing group for these transformations.
Novel chiral Schiff base/Ti(<scp>iv</scp>) catalysts for the catalytic asymmetric epoxidation of N-alkenyl sulfonamides
作者:Nan Ji、Jiani Yuan、Miaoxi Liu、Ting Lan、Wei He
DOI:10.1039/c6cc02852g
日期:——
A new method has been developed for the catalyticasymmetricepoxidation of N-alkenyl sulfonamides in the presence of a Schiff base derived from hydroquinine and Ti(Oi-Pr)4. This reaction proceeds under...