Photoredox‐induced deaminative radical‐cationic three‐component couplings with N‐alkylpyridinium salts and alkenes

N-Benzyl- and N-2°-alkylpyridinium salts were engaged in visible-light-driven, photoredox-induced radical-cationic three-component couplings with N-methylmaleimide acrylonitrile as radical acceptors, combination 1,1-diarylethylenes donor alkenes. These multicomponent coupling reactions could be achieved under mild conditions, high efficiency, to furnish diverse 3,4-disubstituted pyrrolidin-2,5-dione products stereoselectivity. In addition, 2,3-diaryl-1,3-butadienes utilized alternative alkene components, diastereomerically pure 1,2,3-trisubstituted 1,3-butadienes the products.