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 · 发表于：Angewandte Chemie International Edition · 年份：2022 · DOI：10.1002/anie.202202674 · 被引用次数：9 · 研究领域：Catalytic C–H Functionalization Methods、Cyclopropane Reaction Mechanisms、Catalytic Cross-Coupling Reactions

Abstract Catalytic strategies that provide stereoselective access to highly substituted alkenes from abundant monosubstituted substrates are exceedingly sought‐after but rare. Here, we show that a N ‐heterocyclic carbene‐Ni I catalytic species mediates efficient union of electronically polarized terminal olefins with benzyl chlorides, in the presence of trimethylsilyl triflate and trimethylamine additives, to generate trisubstituted boron‐ and arene‐containing trans alkenes in excellent regio‐ and stereoselectivities. Control experiments provide evidence for a mechanism involving branched‐selective Heck‐type benzylation that overrides substrate control, followed by trans ‐selective 1,3‐hydrogen shift. The method represents a significant addition to the toolbox of reactions for the concise synthesis of unsaturated biologically active compounds.