Abstract
AbstractQuinoxalin‐2(1H)‐ones undergo a three‐component radical cascade C3 alkylation reaction with 4‐hydroxycoumarins/4‐hydroxy‐6‐methyl‐2‐pyrone by using vinyl arenes as intermediary radical acceptors. K2S2O8 in dimethylsulfoxide (DMSO) works as the best reagent‐solvent combination, which promotes the reaction under metal‐, photocatalyst‐ and light‐free conditions producing the three‐component products in moderate yields. We also prove the involvement of radicals in the course of the reaction by performing several radical scavenging experiments with 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO), diphenyl ethylene, and butylated hydroxytoluene (BHT).
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