期刊
CHEMICAL SCIENCE
卷 12, 期 8, 页码 2870-2875出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sc06586b
关键词
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资金
- Canada Research Chair Foundation
- Canadian Foundation for Innovation
- FRQNT Centre in Green Chemistry and Catalysis
- Natural Science and Engineering Research Council of Canada
- Canadian Council of Arts
- Fundamental Research Funds for the Central Universities
- Research Funds of Renmin University of China
This study reports the first ruthenium-catalyzed beta-selective alkylation of vinylpyridines with both aromatic and aliphatic aldehyde/ketones via N2H4 mediated deoxygenative couplings. The two-electron umpolung strategy realized reductive deoxygenation targets, allowing for regioselective alkylation of a broad range of substituted pyridines.
Umpolung (polarity reversal) tactics of aldehydes/ketones have greatly broadened carbonyl chemistry by enabling transformations with electrophilic reagents and deoxygenative functionalizations. Herein, we report the first ruthenium-catalyzed beta-selective alkylation of vinylpyridines with both naturally abundant aromatic and aliphatic aldehyde/ketones via N2H4 mediated deoxygenative couplings. Compared with one-electron umpolung of carbonyls to alcohols, this two-electron umpolung strategy realized reductive deoxygenation targets, which were not only applicable to the regioselective alkylation of a broad range of 2/4-alkene substituted pyridines, but also amenable to challenging 3-vinyl and steric-embedded internal pyridines as well as their analogous heterocyclic structures.
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