Fe3O4@SiO2@BHA-Cu(II) as a new, effective, and magnetically recoverable catalyst for the synthesis of polyhydroquinoline and tetrazole derivatives

Abstract

A magnetically recoverable heterogeneous Fe₃O₄@SiO₂@BHA-Cu(II) nanocomposite was prepared by immobilizing a novel Cu(II) complex on the nanoparticles. The catalyst was characterized by FT-IR, TGA, VSM, TEM, FESEM, XRD, ICP, and EDX techniques. The catalytic activity of nanocatalysts in the synthesis of tetrazoles and polyhydroquinoline derivatives was investigated. This new and recyclable magnetic nanocatalyst has outstanding features such as short reaction time, high atom economy, easy work-up, mild reaction conditions, and excellent yields of the products.

Graphical abstract

A non-toxic and practical Fe₃O₄@SiO₂@BHA-Cu(II) nanocatalyst was prepared using accessible and simple starting material. The structure, morphology and properties of nanocatalyst were fully characterized using different techniques. In this method, the catalyst is capable of synthesizing a set of NH-containing heterocycles through multicomponent reactions and also shows good reusability.