Magnetic Nanoparticles Coated with Ethylenediamine Sulfone as an Efficient Heterogeneous Catalyst for the Green Synthesis of 2-Arylbenzoxazoles

In this investigation, an efficient nanomagnetic heterogeneous catalyst, Fe3O4@SiO2@ (CH2)3-en-SO3H/H2SO4 for the synthesis of 2-arylbenzoxazoles by the cyclocondensation reaction of aromatic aldehydes with 2-aminophenol under solvent-free conditions. Catalyst of Fe3O4@SiO2@ (CH2)3-en-SO3H/H2SO4, was synthesized by the immobilization of sulfonated ethylenediamine on the silica-supported magnetic nanoparticles. The catalyst can be recycled magnetically and can be reused several times without a significant decrease in the activity of the catalyst. The present method has several advantages such as excellent efficiency, convenient purification, mild reaction conditions, easy operation and short reaction time. Also nanomagnetic heterogeneous catalyst is found to be an economical, and reusable catalyst with low catalytic loading, a suitable catalyst, stable in air and humidity, heterogeneous and green catalytic.