Abstract
A new method for the synthesis of hitherto unknown substituted 1,7-dihydrospiro-[pyrazolo[3,4-b]pyridine-4,3′-indole]-2′,6(1′H,5H)-diones based on three-component condensation of 5-aminopyrazoles with Meldrum’s acid and isatins is developed.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1460–1464, July, 2009.
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Lichitsky, B.V., Komogortsev, A.N., Dudinov, A.A. et al. Three-component condensation of 5-aminopyrazole derivatives with isatins and Meldrum’s acid. Synthesis of 1,7-dihydrospiro[pyrazolo[3,4-b]-pyridine-4,3′-indole]-2′,6(1′H,5H)-diones. Russ Chem Bull 58, 1504–1508 (2009). https://doi.org/10.1007/s11172-009-0202-4
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DOI: https://doi.org/10.1007/s11172-009-0202-4