Persulfate-promoted radical cascade trifluoromethylthiolation and cyclization of 3-alkyl-1-(2-(alkynyl)phenyl)indoles with AgSCF were investigated. This protocol provides a novel route to CFS-substituted indolo[1,2-]quinoline-7-carbaldehydes and CFS-substituted indolo[1,2-]quinoline-7-methanone derivatives via the formation of the C-SCF bond and C-C bond and benzylic carbon oxidation in a single step. This reaction can accommodate a broad range of functional groups. The single-crystal X-ray diffraction data confirm the chemical structure of the product. A scale-up experiment and radical inhibition experiments were operated in the reaction system. Photophysical properties of some selected 5-((trifluoromethyl)thio)indolo[1,2-]quinoline-7-carbaldehydes were studied by UV-visible and fluorescence spectroscopy.
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