Stereoselective Synthesis of Trisubstituted Alkenes by Nickel‐Catalyzed Benzylation and Alkene Isomerization
作者:Yunlong Zhao、Chen‐Fei Liu、Leroy Qi Hao Lin、Albert S. C. Chan、Ming Joo Koh
DOI:10.1002/anie.202202674
日期:2022.6.27
An NHC−NiI catalyst promotes regio- and stereoselective coupling of polarized terminal olefins with benzyl chlorides to afford trisubstituted borylalkenes and styrenes. The reaction proceeds through branched-selective Heck-type benzylation followed by trans-selective allyl isomerization.
NHC–Cu-Catalyzed Protoboration of Monosubstituted Allenes. Ligand-Controlled Site Selectivity, Application to Synthesis and Mechanism
作者:Fanke Meng、Byunghyuck Jung、Fredrik Haeffner、Amir H. Hoveyda
DOI:10.1021/ol4004178
日期:2013.3.15
Two types of NHC-Cu complexes catalyze protoborations of terminal allenes to afford valuable 1,1- or trisubstituted vinylboron species with high site selectivity and stereoselectivity. The scope of the method, application to natural product synthesis, and mechanistic basis for the observed selectivity trends are presented.