Visible Redox Synergizes with Nickel Catalyst to Construct C—S Bond Reaction
In the synergistic catalytic system of visible light and transition metal nickel,visible photo-catalysis can promote transition metal nickel catalysis through single-electron oxidation or reduction process,and can promote nickel catalytic cycle through energy transfer process.This opens up more possibilities for coupling reactions catalyzed by traditional transition metals.At the same time,most photocatalysts use complexes based on Ru and Ir metals,which are not only expensive,but also have metal residue problems in industrial production.In this paper,a highly efficient and economical syner-gistic catalyst(Nap)2 PXZ-bpy-Ni was developed,with phenoxazine as the organic photocatalyst,NiBr2·DME as the nickel catalyst,and bipyridine as the ligand,which connects the photocatalyst and the bipyridine nickel catalyst by Click.The experimental results show that the yield of C—S bond cou-pling products can reach 73％～95％under 1％catalyst loading for 12 h,achieving efficient catalytic efficiency and showing good functional group applicability and substrate universality.Finally,the pos-sible mechanism of the reaction was speculated by free radical capture experiments.
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维普
