Efficient nickel(II) immobilized on EDTA-modified Fe3O4@SiO2 nanospheres as a novel nanocatalyst for amination of heteroaryl carbamates and sulfamates through the cleavage of C-O bond

In this report, there was immobilized Nickel(II) on EDTA-modified Fe3O4@SiO2 nanospheres and catalytic activity of which was described in the arylation reaction of nitrogen nucleophiles via carbon-oxygen bond cleavage of (hetero)aryl carbamates and sulfamates. This protocol was applied to various nitrogen nucleophiles such as amines, anilines and N-heterocyclic compounds (pyrroles, indoles and imidazoles) in good to excellent yields. This reaction was promoted without the use of any external ligands under simple and mild conditions. The synthesized catalyst was well characterized by FT-IR, XRD, TEM, FE-SEM, TGA, DLS,XPS, VSM, EDX, ICP and nitrogen adsorption-desorption isotherm analysis. The recycling studies revealed that the catalyst could be easily recovered by used the external magnetic field and directly reused for at least 7 times without the significant decrease in its catalytic activity.