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A direct conversion of 2-aminopyridine into 2,3-disubstituted imidazo[1,2-a]pyridines was studied. A series of products was obtained in an efficient, simple and fast protocol. The scope and limitation of the transformation are also studied and was found that its effectiveness and the type of the substituent at 3-position, 3-(1-arylethane) and/or 3-(1-arylethene), is strongly dependent both on the catalyst and on the ketone aromatic substituent. The structures of the products were assigned by 1D and 2D NMR spectra and confirmed by X-ray analyses of selected samples.

Fast and efficient direct conversion of 2-aminopyridine into 2,3-disubstituted imidazo[1,2-a]pyridines