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The catalytic activity of Fe3O4 nanoparticles (NPs) in a one-pot three component condensation reaction consisting of an aromatic aldehyde,urea or thiourea,and a β-dicarbonyl under solvent-free conditions was investigated.This reaction affords the corresponding dihydropyrimidinones (thiones) in high to excellent yields.Compared with the classical Biginelli reactions this method consistently gives a high yield,easy magnetic separation,a short reaction time,and catalyst reusability.