Herein,we report a novel protocol for visible-light-driven alkylative carboxylation of alkenes with CO_(2) in the absence of external photocatalyst.Under the irradiation of visible light,a variety of 4-alkyl-1,4-dihyd...Herein,we report a novel protocol for visible-light-driven alkylative carboxylation of alkenes with CO_(2) in the absence of external photocatalyst.Under the irradiation of visible light,a variety of 4-alkyl-1,4-dihydropyridines(alkyl-DHPs)serve as not only alkyl radical precursors but also photoexcited reductants probably with the potential to reduce benzyl radicals.Several styrenes and acrylates are applicable in this reaction to give structurally diverse carboxylic acids in good to excellent yields.These reactions feature mild reaction conditions(1 atm of CO_(2),room temperature,visible light,photocatalyst-and transition metalfree),good functional group tolerance,easy scalability,as well as high regio-,and chemo-selectivity.Mechanistic investigations provide evidence that alkyl radical,benzyl radical and carbanion might be involved in this reaction,providing a novel strategy for CO_(2) utilization.展开更多
基金supported by the National Natural Science Foundation of China(21822108,21772129)the Fok Ying Tung Education Foundation(161013)+1 种基金Sichuan Science and Technology Program(20CXTD0112)Fundamental Research Funds for the Central Universities。
文摘Herein,we report a novel protocol for visible-light-driven alkylative carboxylation of alkenes with CO_(2) in the absence of external photocatalyst.Under the irradiation of visible light,a variety of 4-alkyl-1,4-dihydropyridines(alkyl-DHPs)serve as not only alkyl radical precursors but also photoexcited reductants probably with the potential to reduce benzyl radicals.Several styrenes and acrylates are applicable in this reaction to give structurally diverse carboxylic acids in good to excellent yields.These reactions feature mild reaction conditions(1 atm of CO_(2),room temperature,visible light,photocatalyst-and transition metalfree),good functional group tolerance,easy scalability,as well as high regio-,and chemo-selectivity.Mechanistic investigations provide evidence that alkyl radical,benzyl radical and carbanion might be involved in this reaction,providing a novel strategy for CO_(2) utilization.
