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In recent years, several groups reported the synthesis oxindoles via C(sp3)-C(sp2) bond formation reactions involving flee-radical-initiated sp3-hybridized C-H bond activation processes.But examples involving the arylalkylation of activated alkenes through metal-free oxidative reactions are scarce.Herein, we have developed a novel metal-free tandem oxidative cyclization reaction of activated alkenes mediated by xanthates.This method possesses remarkable advantages: good to excellent yields; self-regulating, safe, and highly scalable; electron-donating, electron-withdrawing and heteroatom-containing groups can be tolerated.