期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202202674
关键词
Alkene; Benzylation; Isomerization; Nickel Catalysis; Stereoselective
资金
- Ministry of Education of Singapore Academic Research Fund Tier 1 [A-0004139-00-00]
- China Scholarship Council [202006380115]
In this study, a N-heterocyclic carbene-Ni-I catalytic species was used to achieve highly substituted alkenes from abundant monosubstituted substrates with excellent regio- and stereoselectivities. Trimethylsilyl triflate and trimethylamine additives were added to mediate the reaction, resulting in the generation of trisubstituted boron- and arene-containing trans alkenes. This method represents a significant addition to the toolbox of reactions for the concise synthesis of unsaturated biologically active compounds.
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.
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