Fe₃O₄@NCs/Sb(V): As a Cellulose Based Nano-Catalyst for the Synthesis of 4H-Pyrimido[2,1-b]benzothiazoles

Abstract

Fe₃O₄@nano-cellulose/Sb(V) as a bio-based magnetic nano-catalyst was synthesized simply through in situ co-precipitation of Fe³⁺ and Fe²⁺ ions with NH₄OH in an aqueous suspension of nano-cellulose and then treatment of resulted Fe₃O₄@nano-cellulose with antimony pentachloride in chloroform solution. The structure of this novel nano-catalyst was recognized by several analysis methods such as Fourier transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometer, field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and thermo-gravimetric analysis. The potential catalytic ability was investigated in synthesis of 4H-pyrimido[2,1-b]benzothiazole derivatives via a three component reaction of aromatic aldehyde, 2-aminobenzothiazole and ethyl acetoacetate under solvent-free condition at 90 °C. Our research shows that these compounds were synthesized with high yields and purity in short reaction times. Furthermore, the obtained results indicates that Fe₃O₄@nano-cellulose/Sb(V) can be recovered easily and reused for at least three times without no significant change in the efficiency.

Graphical Abstract

Keywords:

• Bio-based catalyst
• Fe₃O₄@nano-cellulose/Sb(V)
• nanocellulose
• 4H-pyrimido[21-b]benzothiazole

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The Research Council of Yazd University gratefully acknowledged for the financial support for this work.