Efficient oxidation of hantzsch 1,4-dihydropyridines with tetrabutylammonium peroxomonosulfate catalyzed by manganese(III) schiff base complexes: The effect of schiff base complex on the product selectivity

Abstract

Efficient and rapid oxidation of Hantzsch 1,4-dihydropyridine with tetrabutylammonium peroxomonosulfate (TBAO) is reported. The Mn(salophen)/monopersulfate catalytic system efficiently converts 1,4-dihydropyridines (DHPs) to their corresponding pyridine derivatives under mechanical stirring and microwave irradiation in CH2Cl2. The ability of various Schiff base complexes to oxidize DHPs was also investigated. The results showed that in the presence of manganese Schiff complex, no by-product was obtained. Copyright © Taylor & Francis Group, LLC.