Fe 3 O 4 @SiO 2 –imid–PMA n magnetic porous nanosphere as recyclable catalyst for the green synthesis of quinoxaline derivatives at room temperature and study of their antifungal activities

Abstract An efficient, simple, and green procedure for the synthesis of quinoxaline derivatives catalyzed by Fe 3 O 4 @SiO 2 –imid–PMA n nanoparticles at room temperature is described. This environmentally benign method provides several advantages such as mild reaction conditions, good to excellent yields, short reaction times, simple work-up and catalyst stability, easy preparation, heterogeneous nature and easy separation of the catalyst. Also, nanocatalyst can be easily recovered by a magnetic field and reused for the next reactions for at least 6 times without distinct deterioration in catalytic activity. SEM, BET, DLS and leaching of catalyst after each reaction cycle were investigated. Furthermore, antifungal activity of various derivatives against three phytopathogenic fungi ( Alternaria alternata , Pyricularia oryzae , and Alternaria brassicae ) was investigated.