Abstract
A facile one-pot green protocol at room temperature has been devised for the synthesis of novel pyrido[2,3-d]-pyrimidine derivatives catalyzed by CeO2-doped hydroxyapatite (CeO2/HAp) with ethanol as solvent. This highly selective method with excellent yields (89–96%) involves a four-component reaction between malononitrile, substituted aldehyde, dimethylbarbituric acid and ammonium acetate. CeO2/HAp was synthesized and characterized by P-XRD, TGA, TEM and SEM analyses. The structures of the target molecules were confirmed by diverse spectroscopic methods (1H NMR, 15N NMR, 13C NMR, and HRMS). Additional benefits of this eco-friendly approach are the operational simplicity, a stable catalyst with good reusability (at least 6 times), short reaction times (< 45 min) and no need for chromatographic separations. All these features make the proposed method economical and sustainable.
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Acknowledgement
The authors are grateful to the National Research Foundation (NRF) of South Africa, and the University of KwaZulu-Natal, Durban, for financial support and research facilities.
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Maddila, S., Gangu, K.K., Maddila, S.N. et al. A viable and efficacious catalyst, CeO2/HAp, for green synthesis of novel pyrido[2,3-d]pyrimidine derivatives. Res Chem Intermed 44, 1397–1409 (2018). https://doi.org/10.1007/s11164-017-3174-2
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DOI: https://doi.org/10.1007/s11164-017-3174-2