A convenient organocatalytic process for the chemoselective synthesis of substituted cyclohex-2-enones was developed. The cascade reaction involves a remarkable Michael addition of an acyclic ketone-based enamine onto unmodified enones. The enamine-mediated aldol–Robinson cascade reactions of aromatic and aliphatic aldehydes with acetone produced substituted cyclohex-2-enones in moderate to high yields under mild reaction conditions.
Copper-Catalyzed Synthesis of Substituted Primary Arylamines from Cyclohexenone Oxime Esters
作者:Yong-Jie Kuang、Yan Yu、Min Zhou、Yu-Cheng Yin、Tian Cai、Qun-Li Luo
DOI:10.1021/acs.orglett.3c03501
日期:2023.12.8
A novel protocol has been developed for the Cu-catalyzed synthesis of primary arylamines with meta-substituents using cyclohexenone oxime esters. Mechanistic insights suggest that the reaction proceeds via an intermolecular 1,5-H hydrogen atom transfer of an imine radical intermediate. This approach features high efficiency, a readily available catalyst system, and broad functional group tolerance