Premium
Chiral Brønsted Acid Catalyzed Dynamic Kinetic Asymmetric Hydroamination of Racemic Allenes and Asymmetric Hydroamination of Dienes
Author(s) -
Lin JinShun,
Li TaoTao,
Jiao GuanYuan,
Gu QiangShuai,
Cheng JiangTao,
Lv Ling,
Liu XinYuan
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201900955
Subject(s) - hydroamination , chemistry , enantioselective synthesis , allylic rearrangement , asymmetric induction , brønsted–lowry acid–base theory , catalysis , combinatorial chemistry , organic chemistry
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, generated from racemic allenes or dienes through a proton transfer mediated by an activating/directing thiourea group. This method affords expedient access to structurally diverse enantioenriched, potentially bioactive alkenyl‐containing aza‐heterocycles and bicyclic aza‐heterocycles.