Nano cobalt ferrite encapsulated-silica particles bearing melamine as an easily recyclable catalyst for the synthesis of dihydropyrano[2,3-c]pyrazoles under green conditions

Abstract

In this research, it was displayed an efficient method for synthesis of 6-amino-2,4-dihydropyrano[2,3-c] pyrazol-5-carbonitrile derivatives by using CoFe2O4 silica supported bearing melamine as a magnetic nanocatalyst. This nanocomposite was prepared in several steps and characterized by XRD, FT-IR, SEM, EDX, VSM, and TGA techniques. The catalyst has a large active site that has functionalized on the surface of nanostructure. The advantages of this magnetic nanocatalyst are simple achievable, effective heterogeneous nanocatalyst, non-toxic, small amount of catalyst used, resulted products with high yields and short reaction times, easy work up, and reusability. The central core nanoparticles are excellent chemical and magnetic stability. Therefore, the magnetic moment of cobalt ferrite relaxes much slower than the magnetite with the similar particle size.