A green magnetic nanocatalyst is developed by immobilization of Fe₃O₄ on Graphitic carbon nitride (g-C₃N₄) support for the efficacious synthesis of 5-arylidenepyrimidine-2,4,6-(1H,3H,5H)-trione and pyrano-pyrimidinone derivatives in aqueous media. The most momentous features of the present protocol are the simple preparation of the catalyst, mild reaction conditions, short reaction times and high yields of the products. Moreover, the magnetic nanocatalyst Fe₃O₄/g-C₃N₄ can be recycled effectively and reused several times, without a significant loss in reactivity.
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