MgFe2O4@SiO2–SO3H: an efficient, reusable catalyst for the microwave-assisted synthesis of benzoxazinone and benzthioxazinone via multicomponent reaction under solvent free condition

Abstract

We report the synthesis of sulfuric acid-functionalized silica-coated magnetic nanoparticles (MgFe2O4@SiO2–SO3H) as a catalyst for the microwave-assisted synthesis of pharmacologically active benzoxazinone and benzthioxazinone via multicomponent reactions under solvent-free conditions. The synthesized catalyst was characterized by FT-IR, XRD, SEM, TEM, EDS, TGA and BET analyses which showed that it had spherical shape, uniform morphology and moderate surface area with super-paramagnetic behavior. The catalyst was easily separated by an external magnet and the main accomplishment of the present work is that the catalyst recycled for five cycles while lacking any major loss of its activity.