OICC Press Journal of Nanostructure in Chemistry 2193-8865 11 2 (June 2021) 2020 10 23 Chitosan magnetic nanocomposite: a magnetically reusable nanocatalyst for green synthesis of Hantzsch 1,4-dihydropyridines under solvent-free conditions 10.1007/s40097-020-00361-x EN Parichehr Kamalzare Department of Chemistry, Karaj Branch, Islamic Azad University, Karaj, IR Behrooz Mirza Department of Chemistry, Karaj Branch, Islamic Azad University, Karaj, IR Somayeh Soleimani-Amiri Department of Chemistry, Karaj Branch, Islamic Azad University, Karaj, IR Journal Article 2020 10 23 Abstract An environmentally friendly method for the efficient synthesis of biologically active 1,4-dihydropyridine derivatives has been performed. The reaction was carried out under solvent-free conditions using chitosan magnetic nanocomposite of Ch-Rhomboclase as an efficient heterogeneous recyclable catalyst. The chitosan magnetic nanocomposite was synthesized through a comfortable and reasonably priced method. It was specified by FT-IR, XRD, EDS, SEM, TEM, VSM, and TGA analyses. Mild reaction conditions, absence of toxic solvent, low catalyst loading, high speed and efficiency, magnetically removable catalyst, and reusability of catalyst are the most important advantages of this method for the synthesis of Hantzsch 1,4-dihydropyridines. Graphic abstract