Butane-1-soltunic acid modified starch-coated γ-Fe2O3 magnetic nanoparticles [γ-Fe₂O₃@starch--butyl SO₃H] was easily prepared through a ring opening reaction of 1, 4-butane sultone with nano-magnetic γ-Fe2O3@starch. After structural studies, using FT-IR, SEM, XRD, TGA, TEM, EDX, VSM and also pH analysis the efficiency of this reagent in the preparation of tetrahydrobenzimidazo[2,1-] quinazolin-1(2)-ones and 2-indazolo[2,1-]phthalazine-triones was studied. Operational simpleness, high yields, short reaction times, wide applicability and simple recyclability of the catalyst employing an external magnet are the most important advantages of this methodology.
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