Synthesis of polysubstituted imidazo[1,2-a]pyridines via microwave-assisted one-pot cyclization/Suzuki coupling/palladium-catalyzed heteroarylation

A new and efficient method for the synthesis of 2,3,6-trisubstituted imidazo[1,2-a]pyridine derivatives using a microwave-assisted one-pot, two-step Suzuki/heteroarylation or one-pot, three-step cyclization/Suzuki/heteroarylation was developed. Polysubstituted compounds are obtained in good yield from 2-amino-5-halogenopyridines, 2-halogenocarbonyl derivatives, boronic acids, and heteroaryl bromides.