In the work, the preparation, characterization and use of Fe3O4@SiO2–ZrCl2-MNPs as nano magnetic reagents in the promotion of some multi-component reactions is reported.

A green, simple and eco-friendly three-component condensation for the synthesis of 1-(benzothiazolylamino)methyl-2-naphthols using new magnetic nanoparticles formulated as Fe 3 O 4 @SiO 2 -ZrCl 2 -MNPs is described. Considering the economic and environmental aspects, the method provides some advantages such as clean procedure, solvent-free conditions, simple operation and work-up, relatively short reaction times and high yields of the products. Moreover the introduced catalyst can be readily recovered up to 4 consecutive runs with consistent activity using an external magnet.

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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.