A Green and Efficient Approach for Preparation of Diaryl Sulfones: Fe₃O₄@DABA-PA-CuBr₂ Nanocomposite Catalyzed One-Pot Three-Component Aryl Iodides, Aryl Boronic Acids, and DABSO (as SO₂ Source)

In this research work, Fe₃O₄@DABA-PA-CuBr₂ nanocomposite was fabricated by a simple and inexpensive method by immobilizing copper(II) bromide on the surface of magnetic nanoparticles modified with 3,4-diaminobenzoic acid and picolinic acid. Deep eutectic solvents or DESs are green and environmentally friendly solvents that are used as catalyst or solvent in many reactions. The utilization of Fe₃O₄@DABA-PA-CuBr₂ nanocatalyst in ChCl–Urea at 100 °C presented an attractive, environmentally benign and highly efficient catalytic system for the preparation of a broad range of diaryl sulfones through one-pot three-component coupling of aryl iodides, aryl boronic acids, and DABSO (as SO₂ source). It should be noted that the Fe₃O₄@DABA-PA-CuBr₂ catalyst was used several times without significant reduction of the catalytic activity. VSM, TEM, and ICP-OES analysis of the reused Fe₃O₄@DABA-PA-CuBr₂ catalyst after eight cycles revealed that that the structure, magnetic property, shape, and size of the particles did not change significantly.