Supported N-propylsulfamic acid on magnetic nanoparticles used as recoverable and recyclable catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones in water

An efficient and eco-friendly method is reported for the synthesis of 2-substituted-2,3-dihydroquinazolin-4（1H）-ones from direct cyclocondensation of anthranilamide with aldehydes and ketones using N-propylsulfamic acid supported onto magnetic Fe304 nanoparticles （MNPs-PSA） as a recoverable and recyclable nanocatalyst in good to excellent yields in water at 70 ℃, The catalyst was readily separated using an external magnet and reusable without significant loss of their catalytic efficiency,