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The photoactivation of electron donor–acceptor complexes has been developed as a renewable, selective, and multifunctional strategy to generate free radicals. Nevertheless, efforts to employ catalytic amounts of organic amines as electron donors in visible-light-promoted reactions are still at a nascent stage. Herein, a novel triarylamine-based electron donor–acceptor complex has been proposed for the successful construction of β-cyanosulfone, enabling a three-component olefinic difunctionalization of aryl thianthrenium salts, (DABCO)·(SO 2 ) 2, and cyanohydrins under visible light conditions through intramolecular 1,4-cyano migration. This strategy has excellent substrate tolerance and broad application prospects in the late modification of pharmaceutically active molecules and agrochemicals while simultaneously advancing the utilization of catalytic quantities of electron donors in photocatalytic electron donor–acceptor (EDA) complex-mediated catalytic systems.
Ji et al. (Fri,) studied this question.