Abstract
An efficient and simple synthesis of spiro[11H-benzo[g]pyrazolo[4,3-b]quinoline-11,3′-[3H]indole]-2′,5,10(1′H)-triones and spiro[acenaphthylene-1(2H),11′-[11H]benzo[g]pyrazolo[4,3-b]quinoline]-2,5′,10′-triones by a three-component condensation reaction of 2-hydroxy-1,4-naphthoquinone, pyrazol-5-amines, and isatins or acenaphthylene-1,2-dione in the presence of p-TSA as an inexpensive and available catalyst in refluxing ethanol is reported.
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We gratefully acknowledge financial support from the Research Council of Shahid Beheshti University.
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Dabiri, M., Tisseh, Z.N. & Bazgir, A. An efficient synthesis of fluorescent spiro[benzopyrazoloquinoline-indoline]triones and spiro[acenaphthylenebenzopyrazoloquinoline]triones. Monatsh Chem 143, 139–143 (2012). https://doi.org/10.1007/s00706-011-0571-x
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DOI: https://doi.org/10.1007/s00706-011-0571-x