Chiral Brønsted Acid Catalyzed Dynamic Kinetic Asymmetric Hydroamination of Racemic Allenes and Asymmetric Hydroamination of Dienes
作者:Jin‐Shun Lin、Tao‐Tao Li、Guan‐Yuan Jiao、Qiang‐Shuai Gu、Jiang‐Tao Cheng、Ling Lv、Xin‐Yuan Liu
DOI:10.1002/anie.201900955
日期:2019.5.20
The first highly efficient and practical chiral Brønsted acid catalyzed dynamic kinetic asymmetric hydroamination (DyKAH) of racemic allenes and asymmetric hydroamination of unactivated dienes with both high E/Z selectivity and enantioselectivity are described herein. The transformation proceeds through a new catalytic asymmetric model involving a highly reactive π‐allylic carbocationic intermediate
Despite the growing interest in iron catalysis and hydroamination reactions, iron‐catalyzed hydroamination of unprotected primary aliphatic amines and unactivated alkenes has not been reported to date. Herein, a novel well‐defined four‐coordinate β‐diketiminatoiron(II) alkyl complex is shown to be an excellent precatalyst for the highly selective cyclohydroamination of primary aliphatic alkenylamines at