Alkyl disulfamic acid-functionalized silica-coated magnetic nanoparticles (ADSA-MNPs) have been
synthesized as a hybrid organic- inorganic acidic nanoparticles and its catalytic activity has been evaluated in the
synthesis of mono-, bis- and tris 1,2-dihydrobenzo[4,5]imidazo[1,2-a]pyrimidine via a one-pot three, pseudo-five
or pseudo-seven component condensation reaction of aromatic aldehydes, malononitrile and 2-aminobezimidazole
under solvent-free heating. The heterogeneous catalyst was facilely separated from the reaction mixture by utilizing
external magnetic field and reused for several times without considerable decrease of catalytic performance.
Keywords: Nanoparticles, magnetite, heterogeneous catalysis, sulfamic acid, imidazo[1, 2-a]pyrimidine,
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