Synthesis of spirooxindole derivatives catalyzed by Fe (III)@graphitic carbon nitride nanocomposite via onepot multicomponent reaction

Fe (III) supported graphitic carbon nitride nanocomposite was synthesized by impregnation of FeCl lt;sub gt;3 lt;/sub gt; with g C lt;sub gt;3 lt;/sub gt;N lt;sub gt;4 lt;/sub gt;(Fe (III)@gC lt;sub gt;3 lt;/sub gt;N lt;sub gt;4 lt;/sub gt;) lt;sub gt;. lt;/sub gt;Then, the synthesis of spirooxindole derivatives was carried out in the presence of Fe (III) @ graphitic carbon nitride nanocompositevia the multicomponent reaction of malononitrile, isatins, and 1,3dicarbonyl compounds in green media (ethanol/water (1:1)) under reflux conditions and the corresponding products were prepared in good to excellent yields (7098 %). Also, the heterogeneous nanocatalyst was characterized by different techniques including the transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), atomic absorption spectroscopy (AAS) and Xray diffraction (XRD). Furthermore, the nanocomposite is recoverable and reusable several times without a negligible decrease in its catalytic performance.