Rhodium-Catalyzed Dynamic Kinetic Asymmetric Transformations of Racemic Allenes by the [3+2] Annulation of Aryl Ketimines
作者:Duc N. Tran、Nicolai Cramer
DOI:10.1002/anie.201304919
日期:2013.9.27
Racemization required: Rhodium(I)‐catalyzed CH activation directed by unprotected ketimines initiates selective [3+2] cycloaddition with allenes, providing access to highly substituted indenylamines. The reaction proceeds through the dynamic kinetic asymmetric transformation of racemic allenes. The catalyst controls the enantio‐ and diastereoselectivity, the regioselectivities of the CH activation and allene
需要消旋:由未保护的酮亚胺引导的铑(I)催化的CH活化可引发与烯丙基的选择性[3 + 2]环加成反应,从而提供了高度取代的茚基胺的通道。反应通过外消旋烯的动态动力学不对称转化而进行。催化剂控制对映和非对映选择性,将C的区域选择性 ħ活化和丙二烯掺入,以及所述ë / Ž比率。