In this paper, we established copper catalyzed reductive borylation of terminal alkynes and diboron on water in the presence of amine. Moderate conditions enabled selective borylations of vinyl-substituted phenylacetylenes to undergo the borylation at a C-C triple bond. The Cu catalyst can be recycled for seven times. (C) 2017 Elsevier Ltd. All rights reserved.
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