solvent-free and diastereoselective synthesis of trans‐2,3‐Dihydrofuran derivatives in the presence of nano silica Phosphotungstic acid

Abstract

In this research, nano-silica coated with phosphotangestic acid was used as a new, effective and heterogeneous high-selectivity catalyst for the diastereoselective synthesis of trans-2,3-dihydrofuran during, multi-component one-pot and solventless reaction. In this reaction, the in-situ production and condensation of pyridinium bromide ylide are carried out with benzaldehyde and 4-hydroxy-coumarin derivatives. The size and shape of the catalyst were studied using detection methods such as scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction spectroscopy (EDS), and Fourier-transform infrared spectroscopy (FT-IR). Also, the BET analysis of this nano-catalyst showed a high surface area, which could be a factor in the good performance of this nano-catalyst. An induction coupled plasma analysis also confirmed the ability to recover of this nanocatalist.The reaction products were evaluated using FT-IR spectroscopy and melting point determination. High efficiency, short reaction time, solventless conditions and easy product separation method are the future advantages of this research.

Keywords

• nano-silica
• nano-silica phosphotangestic acid
• trans-dihydrofuran
• green chemistry
• four-component and diastereoselective synthesis