Ni-Catalyzed Intermolecular Carboacylation of Internal Alkynes via Amide C–N Bond Activation
作者:Mason T. Koeritz、Russell W. Burgett、Abhishek A. Kadam、Levi M. Stanley
DOI:10.1021/acs.orglett.0c01607
日期:2020.8.7
The Ni-catalyzed carboacylation of alkynes with amide electrophiles and triarylboroxines is presented. The reaction generates all-carbon tetrasubstituted alkene products in up to 62% yield. NiCl2·glyme is used as an inexpensive precatalyst in the absence of any external reductant or exogenous ligand. Design of Experiment (DoE) was used to achieve the best combination of yield and stereoselectivity
Friedel-Crafts-type acylation of alkenes with acyl chlorides has been successfully conducted with a wide substrate scope by the combined use of AlCl3 and 2,6-dibromopyridine. Trisubstituted alkenes afford allylketones or vinylketones depending on the presence or absence of hydrogen atom(s) at the beta-position to the acylation site, while monosubstituted alkenes exclusively afford vinylketones.
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