The visible light induced C–H bond thiocyanation on the α-site of tertiary enaminones has been realized under metal-free, photocatalytic conditions in the presence of Rose Bengal, which enables the synthesis of thiocyanated alkene derivatives and chromones using NH 4 SCN as the thiocyano source under an aerobic atmosphere. In addition, employing Ru(bpy) 3 Cl 2 ·6H 2 O as the photocatalyst switches the reaction pathway to provide NH 2 -functionalized thiocyanated enamines via the difunctionalization process consisting of C–H bond thiocyanation and vinyl C–N bond transamination.
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Gao et al. (2019) studied this question.
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