Synthesis, characterization and catalytic application of Fe3O4@Cys–SO3H for preparation of 2H-indazolo[1,2-b]phthalazine-triones

Abstract

The surface ofFe₃O₄magnetic nanoparticles (MNPs) was modified by L-cysteine through condensation of COOH groups of <br /> L-cysteine and OH groups on the surface of Fe₃O₄. The –SH group of preparedFe₃O₄@Cys MNPs oxidized to –SO₃H group and Fe₃O₄@Cys–SO₃H as an environmentally friendly magnetic nanoparticle was prepared. The MNPs were characterized by FT-IR, XRD, SEM and TEM studies. Then, the catalytic activity of the MNPs was evaluated as an effective and reusable catalyst for one-pot synthesis of 2<em>H</em>‐indazolo [1,2‐<em>b</em>] phthalazine‐triones derivatives. The results show that the catalytic activity of Fe₃O₄@Cys–SO₃H was comparable to that of other reported heterogeneous and homogeneous catalysts.