Ni-Catalyzed Regioselective β,δ-Diarylation of Unactivated Olefins in Ketimines via Ligand-Enabled Contraction of Transient Nickellacycles: Rapid Access to Remotely Diarylated Ketones
作者:Prakash Basnet、Roshan K. Dhungana、Surendra Thapa、Bijay Shrestha、Shekhar KC、Jeremiah M. Sears、Ramesh Giri
DOI:10.1021/jacs.8b03163
日期:2018.6.27
zed regioselective β,δ-diarylation of unactivated olefins in ketimines with arylhalides and arylzinc reagents. This diarylation proceeds at remote locations to the carbonyl group to afford, after simple H+ workup, diversely substituted β,δ-diarylketones that are otherwise difficult to access readily with existing methods. Deuterium-labeling and crossover experiments indicate that diarylation proceeds
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