Abstract
This research work focuses on the potential usefulness of iron ion-exchanged Indian bentonite for one-pot synthesis of 3,4-dihydropyrimidine-2(1H)-thiones. Our goal was to produce mesoporous Fe3+-exchanged Indian clay (Fe3+-ExIC) and its supported forms through a wet impregnation technique. The physicochemical properties of the catalysts, such as XRD, FTIR, TGA, physisorption studies, SEM, and acidity, were investigated. It was found that Fe3+-ExIC catalysts are efficient and reusable acidic heterogeneous catalysts for the synthesis of 3,4-dihydropyrimidine-2(1H)-thiones by refluxing aldehyde, methyl acetoacetate and thiourea with acetonitrile in cyclocondensation. An optimized reaction condition was found for preparing 5-methoxycarbonyl-6-methyl-4-phenyl-3,4-dihydropyrimidin-2(1H)-thione. A possible mechanism for the synthesis of 3,4-dihydropyrimidine-2(1H)-thiones has been proposed. Melting point, FTIR, and proton NMR were used to identify the products. Adequate catalyst activity was maintained over a period of six cycles, and a reduction in activity was attributed to a decrease in the acidity of the recycled catalyst.
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Acknowledgements
BVK is thankful to the SERB, Ministry of DST, Government of India for sanctioning the research project (Project No. SB/FT/CS-089/2012). The authors thank Vel Tech High Tech Dr. RR Dr.SR Engineering College for providing research facilities.
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The SERB, Ministry of DST, Government of India had provided financial support for this study (Project No. SB/FT/CS-089/2012).
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MK: Experimental and Characterization work analysis; KS: Data analysis, Visualization, and Characterization work analysis; VB: Conceptualization, Investigation, Writing-Original Draft, Funding Acquisition.
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Kancherla, M., Seku, K. & Badathala, V. An efficient three-component one-pot synthesis of 3, 4-dihydropyrimidin-2-(1H)-thione derivatives with a mesoporous iron ion exchanged Indian clay catalyst. Res Chem Intermed 50, 2307–2324 (2024). https://doi.org/10.1007/s11164-024-05247-z
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DOI: https://doi.org/10.1007/s11164-024-05247-z