A green method for the synthesis of indeno[1,2-b]pyridines using Fe3O4@SiO2@PrSO3H as a nanomagnetic catalyst

Authors

• Zohreh Kheilkordi ¹
• Ghodsi Mohammadi Ziarani * ¹
• Alireza Badiei ²
• Hossein Vojoudi ³

1. Department of Chemistry, Alzahra University, Vanak Square, P.O. Box 1993893973, Tehran, Iran.
2. School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
3. School of Chemistry, College of Science, University of Tehran, Tehran, Iran

Abstract

The acidic agent (SO₃H) was stabilized on the silica coated Fe₃O₄ magnetic nanoparticles to produce Fe₃O₄@SiO₂@Pr-SO₃H, as a heterogeneous acidic catalyst, was designed, and then fully studied and characterized by FT-IR, XRD, TGA, DTA, TEM, and SEM analysis. Subsequently, the catalytic activity of Fe₃O₄@SiO₂@PrSO₃H was investigated by the one-pot
four- component condensation reaction between 1,3-indandione, aromatic aldehydes, acetophenone or propiophenone and ammonium acetate under the solvent-free condition at 80 ℃. The main advantages of this magnetic and heterogeneous acidic catalyst are high product yields, being environmentally benign, short reaction times, and easily separated from the reaction mixture using an external magnet.

Keywords

• Fe3O4@SiO2@PrSO3H
• Nanomagnetic heterogeneous catalyst
• Indeno[1
• 2-b]pyridines
• multi component reaction. Solvent-free condition