An efficient and versatile protocol for the C-H sulfonylation of imidazoheterocycles electrochemical activation was established under batch and flow conditions. The selective C-H bond functionalization proceeded under catalyst- and oxidant-free conditions and tolerated a wide range of functional groups. Various sodium sulfinates as well as imidazo[1,2-]-pyridines, -pyrimidine, -quinolines, and -isoquinolines, imidazo[1,2-]pyridazine, imidazo[2,1-]thiazoles and benzo[]imidazo[1,2-]thiazoles reacted successfully.
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