The application of copolymer-coated graphene oxide-Fe3O4 in the highly efficient synthesis of 2′-aminospiro[indeno[1,2-b]quinoxaline-11,4′-[4'H] pyran]-3′-carbonitrile and 2′-aminospiro[indeno-2,4′-[4'H]pyran]-3′-carbonitrile

A magnetic nanocomposite based on graphene oxide was prepared. Fe3O4 nanoparticles were loaded on graphene oxide sheets and GO-Fe3O4 was covered by aniline-pyrrole copolymer to afford poly(Py-co-Ani)@GO-Fe3O4. This nanocomposite was characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, vibrating sample magnetometry, X-ray diffraction, thermogravimetric analysis, and X-ray photoelectron spectroscopy techniques, and its catalytic activity was evaluated in the multicomponent synthesis of 2 '-aminospiro[indeno[1,2-b]quinoxaline-11,4 '-[4'H]pyran]-3 '-carbonitrile and 2 '-aminospiro[indeno-2,4 '-[4'H]pyran]-3 '-carbonitrile derivatives. This magnetically separable catalyst is heterogeneous noncorrosive, highly efficient, and reusable.