期刊
CHEMICAL SCIENCE
卷 9, 期 34, 页码 6928-6934出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sc02074d
关键词
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资金
- Ministry of Education (Singapore)
- Nanyang Technological University [RG3/15, RG114/15, MOE2016-T2-2-043]
Cobalt-diphosphine catalysts promote ring-opening coupling reactions between cyclopropanols and unactivated internal alkynes, affording either -alkenyl ketones or multisubstituted cyclopentenol derivatives in good yields with good to excellent regioselectivities. The chemoselectivity between these -alkenylation and [3 + 2] annulation reactions, which likely share a cobalt homoenolate as a key catalytic intermediate, is exquisitely controlled by the reaction conditions, with the solvent being a major controlling factor. The reactions are proposed to involve ring opening of cobalt cyclopropoxide into homoenolate, migratory insertion of the alkyne into the Co-C bond, and protodemetalation or intramolecular carbonyl addition of the resulting alkenylcobalt species. The feasibility of these reaction steps was supported by DFT calculations.
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