Abstract
Cellulose is among the most abundant natural carbon-based biopolymers containing free OH groups with nucleophilic character for bonding to Lewis acids such as TiCl4. Nano-TiCl2/cellulose as a bio-based and eco-friendly Lewis acid catalyst was prepared via reaction of nano-cellulose and TiCl4 in dichloromethane as solvent under room temperature conditions. This catalyst has been characterized by Fourier transform infrared spectroscopy, field emission scanning electron microscopy, powder X-ray diffraction, energy dispersive X-ray spectroscopy, X-ray fluorescence techniques, and transmission electron microscopy. Nano-TiCl2/cellulose has been shown to effectively promote multi-component synthesis of 4H-pyrimido[2,1-b]benzothiazole derivatives by reaction of aldehydes, β-ketoester, and 2-amino benzothiazole under thermal conditions in polyethylene glycol 400 as solvent. Simple methodology,an eco-friendly catalyst, a clean procedure, easy work-up, and excellent yields are some of the important advantages of this protocol.
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The Research Council of Yazd University is gratefully acknowledged for the financial support for this work.
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Azad, S., Mirjalili, B.B.F. Nano-TiCl2/cellulose: an eco-friendly bio-based catalyst for one-pot synthesis of 4H-pyrimido[2,1-b]benzothiazole derivatives. Res Chem Intermed 43, 1723–1734 (2017). https://doi.org/10.1007/s11164-016-2725-2
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DOI: https://doi.org/10.1007/s11164-016-2725-2