Synthesis and characterization of MgO nanoparticles supported on ionic liquid-based periodic mesoporous organosilica (MgO@PMO-IL) as a highly efficient and reusable nanocatalyst for the synthesis of novel spirooxindole-furan derivatives

The synthesis and catalytic application of a novel MgO containing periodic mesoporous organosilica with ionic liquid framework (MgO@PMO-IL) is described. The prepared MgO@PMO-IL was characterized by Fourier transform-infrared spectroscopy, N-2 adsorption/desorption, transmission electron microscopy, field emission-scanning electron microscopy, thermogravimetric and inductively coupled plasma analyses. This nanocatalyst was successfully applied as a highly efficient and recoverable catalyst for the synthesis of novel spirooxindole-furan derivatives via the three-component reaction of 1,3-dicarbonyl compounds, N-phenacyl pyridinium salts and isatin derivatives. The products were achieved in high to excellent yields with a simple work-up procedure and short reaction times, and the catalyst could be recovered through a simple filtration process and successfully reused seven times without any significant decrease in its efficiency.