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I 2 –NH 4 OAc was found to be an efficient system for the metal-free synthesis of diversely substituted imidazo[1,2- a ]pyridines 3a – r from 2-aminopyridine 1 and aryl methyl ketones 2a – r in one pot. 2-Arylimidazo[1,2- a ]pyridines 3a – r were obtained in good to excellent yields via in situ generation of an Ortoleva–King intermediate (pyridinium iodide), followed by NH 4 OAc-assisted cyclization.

Ethyl 3,5-diaryl-1H-pyrrole-2-carboxylates have been synthesized in good yields from ethyl 2-nitro-5-oxo-3,5-diarylpentanoates by treatment with triethylphosphite under microwave irradiation. The integrity of the mechanism proposed has been augmented by 31P NMR and EIMS experiments.