Abstract
Silica-supported lanthanum (III) chloride (SiO2–LaCl3·7H2O) was prepared and characterized by infrared spectroscopy, X-ray diffraction analysis, scanning electron microscope, energy-dispersive X-ray spectroscopy, thermogravimetric analysis and differential thermal analysis techniques. The catalytic activity of this silica-supported lanthanum (III) chloride was investigated in a one-pot three-component Kabachnik-Fields reaction. A library of new α-aminophosphonates was prepared employing various benzothiazole and thiadiazole amines, different substituted aldehydes and diethylphosphite under solvent-free conditions using conventional/microwave methods with good to excellent yields (85–97%). The advantages of this catalyst are that it is environmentally benign, economically inexpensive, and easy to prepare, gives high yields and high purity is less time-consuming, offers easy purification is reusable and enables products to be obtained by simple recrystallization without column chromatography.
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Acknowledgments
The author, SK. Thaslim Basha expresses a deep sense of gratitude to University Grant Commission for awarding SRF and financial support. The authors also thank IIT Madras for providing spectroscopic and analytical data. This work was also supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (NRF-2019R1A2C1003735 and NRF-2020R1A6A1A03043435).
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Basha, S.K.T., Kalla, R.M.N., Varalakshmi, M. et al. Heterogeneous catalyst SiO2–LaCl3·7H2O: characterization and microwave-assisted green synthesis of α-aminophosphonates and their antimicrobial activity. Mol Divers 26, 2703–2715 (2022). https://doi.org/10.1007/s11030-021-10360-x
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DOI: https://doi.org/10.1007/s11030-021-10360-x