Novel AlCl3@nano Fe3O4-SiO2: a benign multi-layer magnetite nanocatalyst for the three-component one-pot synthesis of spiro[benzochromeno [2,3-d]pyrimidin-indolines]

In this paper, sublimated AlCl3 has been embedded on nanosilica-Fe3O4 core via a simple method to obtain novel AlCl3@nano Fe3O4-SiO2 nanostructure for the first time. The newly synthesized solid has been characterized by Fourier transformed infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDAX), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), Brunauer-Emmett-Teller (BET) measurements, and potentiometric titration techniques. The reactivity of the prepared nanoparticles was investigated in the synthesis of spiro[benzochromeno[2,3-d]pyrimidin-indolines] through the one-pot three-component condensation of different naphthols, isatin derivatives, and barbituric acids in the in refluxing ethanol successfully. The recovery and reusability of the nanostructure has also been examined within 4 runs without activity loss.

Automated summary

In this study, a novel AlCl3@nano Fe3O4-SiO2 nanostructure was successfully prepared and showed good reactivity and recyclability in chemical synthesis processes.