γ-Aminobutyric acid hydrochloride supported on superparamagnetic γ-Fe2O3@SiO2 as a novel heterogeneous nanocatalyst for the synthesis of 2-amino-5-alkylidene-thiazol-4-one derivatives

γ-Aminobutyric acid hydrochloride immobilized on superparamagnetic γ-Fe2O3@SiO2 nanoparticles as a novel heterogeneous nanocatalyst was prepared for the first times. It was characterized by several techniques such as XRD, FT-IR, VSM, FE-SEM, EDS, and TGA analysis. The heterogeneous nanocatalyst was used for a convenient, mild, and one-pot efficient three-component preparation of 2-amino-5-alkylidene-thiazol-4-one derivatives under green conditions at room temperature. The main advantage of the method is easily recovery of the stable nanocatalyst by an external magnet from the reaction mixture.