Abstract
A simple and efficient method was developed for the synthesis of multisubstituted bispyrano[2,3-c]pyrazole derivatives via one-pot reaction of β-keto esters, hydrazine (or phenylhydrazine), terephthalaldehyde, and malononitrile in the presence of CeCl3·7H2O (10 mol%) as a catalyst. This method provides the products in good yields after a simple workup procedure without further purification.
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Acknowledgments
We gratefully acknowledge the Natural Science Foundation of China (No. 21162028) and the Natural Science Foundation of Xinjiang Science Technology Agency (No. 2009 211A02).
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Ablajan, K., Wang, LJ., Maimaiti, Z. et al. CeCl3-promoted one-pot synthesis of multisubstituted bispyrano[2,3-c]pyrazole derivatives. Monatsh Chem 145, 491–496 (2014). https://doi.org/10.1007/s00706-013-1104-6
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DOI: https://doi.org/10.1007/s00706-013-1104-6