Pyridylmethylaminoacetic acid functionalized Fe3O4 magnetic nanorods as an efficient catalyst for the synthesis of 2-aminochromene and 2-aminopyran derivatives

2-[(2-pyridylmethyl)amino]acetic acid (pmaa) functionalized fe3o4 superparamagnetic nanorods efficiently catalyzed three-component reaction of malononitrile, aromatic aldehydes and phenolic or enolic components, such as α-naphthol, β-naphthol, dimedone or kojic acid, to synthesize a variety of chromene or pyran derivatives in good to high yields. pmaa functionalized fe3o4 magnetic nanorods were prepared via simple coprecipitation from an aqueous solution of fe^2+ and fe^3+ ions using nh4oh in the presence of glycine, followed by subjecting with 2-pyridine carbaldehyde and then nabh4-mediated reduction of in-situ generated imine. obtained nanorods were characterized by ft-ir, xrd, tga, sem, edx, tem, bet and vsm analysis.