Nickel-Catalyzed Enantioselective Cross-Couplings of Racemic Secondary Electrophiles That Bear an Oxygen Leaving Group
作者:Alexander J. Oelke、Jianwei Sun、Gregory C. Fu
DOI:10.1021/ja300031w
日期:2012.2.15
date, effective nickel-catalyzed enantioselective cross-couplings of alkyl electrophiles that bear oxygen leaving groups have been limited to reactions of allylic alcohol derivatives with Grignard reagents. In this Communication, we establish that, in the presence of a nickel/pybox catalyst, a variety of racemic propargylic carbonates are suitable partners for asymmetric couplings with organozinc reagents
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