Herein, we report a greener protocol for the synthesis of 3‐Se/S‐indoles and imidazo[1,2‐ a ]pyridines through direct C(sp 2 )−H bond chalcogenation of heteroarenes with half molar equivalents of different dichalcogenides, using KIO 3 as a non‐toxic, easy‐to‐handle catalyst and a stoichiometric amount of glycerol. The reaction features are high yields, based on atom economy, easy performance on gram‐scale, metal‐ and solvent‐free conditions as well as applicability to different types of N‐heteroarenes.
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Rafique et al. (2017) studied this question.
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