Nano-cell-OBF2: an efficient and cheap catalyst for one-pot synthesis of pyrano[4,3-b]pyrans under mild and green condition

Abstract

Newly synthesized nano-cell-OBF2 catalyst was produced via boron trifluoride as lewis acid and nano cellulose as substrate. The obtained novel nanostructure has been assessed using Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FE-SEM), and Energy dispersive X-ray spectroscopy (EDX) techniques. In addition, the decomposition steps and thermal stability of the nano-cellulose and nano-cell-OBF2 were investigated by thermal analysis techniques (TGA/DTG). The activity of solid acid catalyst has been effectively inspected in a one-pot, three-component condensation reaction of aromatic aldehydes, 4-hydroxy-6-methyl-2H-pyran-2-one and malononitrile under mild reaction conditions to afford pyrano [4,3-b] pyran derivatives in good to excellent yields.