Abstract
Nano magnetic complex lanthanum strontium magnesium oxide La0.7Sr0.3MnO3 (LSMO) has been explored as an efficient and recyclable catalyst to effect the one-pot three-component condensation reactions between aromatic aldehydes, malononitrile and 5,5-dimethyl-cyclohexane-1,3-dione, or 3-methyl-1-phenyl-2-pyrazolin-5-one in EtOH under ultrasound irradiation conditions. 2-Amino-5-oxo-5,6,7,8-tetrahydro-4H-chromenes and 1,4-dihydropyrano[2,3-c]pyrazol-5-yl cyanides were respectively synthesized from these reactions in high yields. This nano-catalyst can be easily recovered via magnetic concentration and reused without any significant drop in its catalytic activity.
Graphical abstract
Magnetic La0.7Sr0.3MnO3 nanoparticles have been explored to efficiently catalyze the one-pot condensation of aromatic aldehydes, malononitrile and 5,5-dimethyl-cyclohexane-1,3-dione, or 3-methyl-1-phenyl-2-pyrazolin-5-one in EtOH under ultrasound-irradiation conditions. As a result, 2-Amino-5-oxo-5,6,7,8-tetrahydro-4H-chromenes and 1,4-dihydropyrano[2,3-c]pyrazol-5-yl cyanides were produced respectively in excellent yields. High efficiency, easy workup, high yields, use of cost-effective and non toxic catalyst are the main merits of this method.
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Acknowledgments
This work was supported by the Research Council of the Bu-Ali Sina University (Iran). The School of Applied Sciences, Royal Melbourne Institute of Technology in Australia is also gratefully acknowledged for preparation and instrumental analysis of the catalyst LSMO.
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Azarifar, A., Nejat-Yami, R., Al Kobaisi, M. et al. Magnetic La0.7Sr0.3MnO3 nanoparticles: recyclable and efficient catalyst for ultrasound-accelarated synthesis of 4H-chromenes, and 4H-pyrano[2,3-c]pyrazoles. J IRAN CHEM SOC 10, 439–446 (2013). https://doi.org/10.1007/s13738-012-0177-1
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DOI: https://doi.org/10.1007/s13738-012-0177-1