We report herein an effective method for the halogenation of imidazo-fused heterocycles using readily available sodium salts (NaCl/NaBr/NaI) as halogen source and KSO (or) oxone as promoter. A variety of C-3 halogenated imidazo[1,2- a]pyridines and benzo[d]imidazo[2,1- b]thiazoles were obtained in good to excellent yields. The present method of halogenation has been also extended to 2-aminopyridines, 2-aminopyrimidine, indole, and isoquinoline with moderate to excellent yields.
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