Cr-Catalyzed Regio-, Diastereo-, and Enantioselective Reductive Couplings of Ketones and Propargyl Halides
作者:Xiaochong Guo、Zhaoxin Shi、Feng-Hua Zhang、Zhaobin Wang
DOI:10.1021/acscatal.3c00177
日期:2023.3.3
reactivity and stereoselectivitycontrol. Herein, we developed the Cr-catalyzed asymmetric reductive coupling of racemic propargylic chlorides and ketones, affording valuable chiral tertiary alcohols bearing vicinal stereocenters. These reactions proceed efficiently under mild conditions in a radical–polar crossover manner with good regio-, diastereo-, and enantioselectivity control. Preliminary mechanistic
The Construction of Highly Substituted Piperidines via Dearomative Functionalization Reaction
作者:Miao Hu、Hao Ding、William DeSnoo、Dean J. Tantillo、Zackaria Nairoukh
DOI:10.1002/anie.202315108
日期:2023.12.4
The stepwise dearomative functionalization reaction of pyridines generates highlysubstituted piperidines, featuring diverse functional handles, with excellent site-, regio-, and diastereoselectivity. The origin of the unprecedented selectivities and additional insights into the reaction mechanism are discussed based on combined experimental mechanistic studies and density functional theory computations