One-pot synthesis of pyran derivatives using silica-coated magnetic nanoparticles functionalized with piperidinium benzene-1,3-disulfonate as a new efficient reusable catalyst

Fe3O4 nanoparticles were coated with silica followed by surface modification using a silylating agent and piperidine to obtain piperidinium benzene-1,3-disulfonate salt (PBDS) silica-coated magnetic nanoparticles (SCMNPs). The obtained catalyst was then analyzed using various characterization techniques, including thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) imaging, and X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and energy-dispersive X-ray (EDX) analyses. The heterogeneous catalytic activity was investigated in one-pot pseudo-three-component synthesis of pyran derivatives, revealing efficient action and giving the products in high yield under green and sustainable conditions. A novel efficient green reusable catalyst was obtained from silica-coated magnetic nanoparticles functionalized with piperidinium benzene-1,3-disulfonate for synthesis of 9-aryl-9H-2,4,5,7-tetramethyl-diuracilopyrans as well as 9-aryl-3,4,6,7-tetrahydro-2H-pyran-1,8(5H,9H)-diones.