sulfonated-titanomagnetite nanoparticles as potential and recyclable catalyst for the synthesis of dihydroquinazoline and hexahydroquinoline derivatives under solvent-free condition

The performance of sulfonated-titanomagnetite nanoparticles (fe3-xtixo4-so3h nps) as useful and recyclable nanocatalyst for the synthesis of dihydroquinazoline and hexahydroquinoline derivatives through multi-component reaction approach in solvent-free condition were investigated extensively. the successful synthesis of mentioned derivatives was confirmed using fourier-transform infrared (ft-ir) as well as 1h/13c nuclear magnetic resonance (nmr) spectroscopies. according to the results, the employed nanocatalyst has some advantages such as high catalytic activity in short reaction time, good-to-excellent isolated yields in most cases, easy workup process, smooth processing feature of the reactions, facile recovery using an external magnetic field, and re-usability for four times without significant loss in its activity.