Recyclization by hydrazine of furo[3,2-b]pyrano[2,3-f]chromen-4-ones, dipyrano[2,3-b:2,3-f]chromen4-ones, and pyrano[2,3-a]xanthen-4-ones derived from natural isoflavonoids and their analogs was studied. The reaction was shown to proceed selectively with opening of the chromone ring. Several substituted 4-arylpyrazoles containing furo[3,2-b]chromen-5-ol, pyrano[2,3-b]chromen-6-ol, and xanthen-8-ol fragments were synthesized.
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Translated from Khimiya Prirodnykh Soedinenii, No. 4, July–August, 2018, pp. 554–558
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Mrug, G.P., Bondarenko, N.V., Bondarenko, S.P. et al. Reactivity of Condensed Isoflavone Derivatives for Hydrazine. Chem Nat Compd 54, 654–659 (2018). https://doi.org/10.1007/s10600-018-2439-3
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DOI: https://doi.org/10.1007/s10600-018-2439-3