Sulfonic acid functionalized silica-coated CuFe2O4 core–shell nanoparticles: an efficient and magnetically separable heterogeneous catalyst for the synthesis of 2-pyrazole-3-amino-imidazo-fused polyheterocycles

Abstract

Sulfonic acid functionalized silica-coated CuFe₂O₄ magnetic nanoparticles were synthesized and characterized by XRD, TEM, SEM, FTIR, EDX, and VSM analysis. The synthesized nanocrystalline CuFe₂O₄@SiO₂–SO₃H was used as catalyst for the synthesis of medicinally relevant 2-pyrazole-3-amino-imidazo-fused polyheterocycles. The catalyst offers several advantages such as non-toxicity, high stability, paramagnetic nature and shortest reaction time.