A facile microwave assisted reaction of phenacyl bromide and 2-amino pyridine is catalyzed by an ionic liquid 1-(4-sulfonic acid) butylpyridinium hydrogen sulfate under solvent free conditions to give corresponding imidazo[1,2-a]pyridines in good yields. Reactions proceed with high efficiency and good functional group tolerance. This approach provides a useful protocol for the preparation of highly substituted imidazo[1,2-a]pyridine derivatives.
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