Synthesis of Bis(aminopyrimidine) Derivatives using Graphene Immobilized Cobalt Ferrite (CoFe2O4@CS@GO) as Catalyst

In this study, graphene oxide immobilized on chitosan contains cobalt ferrite (CoFe2O4@CS@GO) as a new recyclable magnetic nabnocatalyst was used in the synthesis of bis(aminopyrimidine) derivatives by the reaction of aromatic aldehydes and 6-aminouracil in ethanol with good to excellent yields under reflux conditions. The CoFe2O4@CS@GO catalyst can be easily recovered by magnetic separation and used several times without significantly reducing its catalytic activity. The catalyst was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDs) and vibrating sample magnetometer (VSM).The high efficiency of the products and easy separation of the nanocatalyst from the products with external permanent magnet are some advantages of this method. Products were identified by the comparison of their physical properties and spectra data, with those reported for authentic samples.