Fe3O4@SiO2@Pr-Oxime-(BuSO3H)3 synthesis and its application as magnetic nanocatalyst in the synthesis of heterocyclic [3.3.3]propellanes.

The modification of Fe3O4 nanomagnetic particles with inorganic and organic compounds was accomplished. The Fe3O4@SiO2@Pr-Oxime-(BuSO3H)3 as Brønsted acid was synthesized by functionalization of Fe3O4 in several steps and characterized by various techniques. Domino reaction of dimedone, anilines, ninhydrin, and malononitrile was investigated by a magnetic catalyst without using solvent at 80 °C. This method has many advantages including short reaction time, green conditions, ecofriendly, excellent yields of products, and easy separation by an external magnet. [ABSTRACT FROM AUTHOR]