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A novel urea-functionalized silica-coated magnetic nanoparticle namely Fe 3 O 4 @SiO 2 @UBL was described as a reusable and recoverable heterogeneous hydrogen bonding catalyst. For characterization of the catalyst, varied techniques including Fourier-transform infrared (FT‐IR) spectroscopy, energy dispersive X‐ray (EDX) analysis, elemental mapping analysis, thermo gravimetric analysis/differential thermal analysis (TGA/DTG), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) were applied. Then, its catalytic performance was screened for the synthesis of new 2-hydroxy pyridine derivatives bearing sulfonate or sulfonamide moiety. Also, in a plausible mechanistic route, the stereoelectronic role of a cooperative vinylogous anomeric-based oxidation is suggested for the aromatization of targeted molecules.

Novel Urea-Functionalized Magnetic Nanoparticles as a Heterogeneous Hydrogen Bonding Catalyst for the Synthesis of New 2-Hydroxy Pyridines