Magnetic Nanoparticles Immobilized Palladium Complex: A Novel and Highly Active Catalyst for Synthesis of Sulfonamides

In this method, a novel and efficient magnetically reusable catalyst [Fe₃O₄@DAPA-Pd(0)] was prepared through the immobilization of Pd(0) complex on Fe₃O₄ nanoparticles coated with 2,3-diaminopropionic acid and its catalytic behavior was evaluated in the preparation of sulfonamide derivatives through one-pot three-component reactions of aryl or heteroaryl iodides, amines and SO₂ under ecofriendly conditions. A number of spectroscopic techniques including FT-IR, VSM, TGA, EDX, elemental mapping, TEM, SEM, XRD and ICP-OES techniques was used to identify the Fe₃O₄@DAPA-Pd(0) nanocatalyst. This method suggested a number advantages such as the preparation of sulfonamide products with high yields, identify the all sulfonamide products by HNMR and CNMR, the performance of the reactions in [BMIM]PF₆ as green solvent, simple separation of the Fe₃O₄@DAPA-Pd(0) catalyst by an external magnet and high reusability of the catalyst. VSM, TEM, TGA and ICP-OES techniques was confirmed the high stability and efficiency of the recovered catalyst after 8 times.