Oxidative aromatization of Hantzsch 1,4-dihydropyridines in the presence of mixed-addenda vanadomolybdophosphate heteropolyacid, H6PMo9V3O40

A variety of Hantzsch 1,4-dihydropyridines were oxidized to the corresponding pyridines in high yields in the presence of H6PMo9V3O40, a Keggin type heteropolyacid, in refluxing acetic acid. The heteropolyacid was found to be reusable.

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