Reactions of 4-aryl-6-trifluoromethyl-2H-pyran-2-ones with sodium hydroxide followed by acidification provided the respective 6-hydroxy-5,6-dihydro derivatives, while the reactions of 4-aryl-6-trifluoromethyl-2H-pyran-2-ones with hydrazine and hydroxylamine were accompanied by rearrangement to N-substituted 6-hydroxy-5,6-dihydro-2-pyridones.
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This work was performed with financial support from the Russian Foundation for Basic Research (grant No. 1703-00340).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2017, 53(12), 1294–1301
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Usachev, S.A., Usachev, B.I. & Sosnovskikh, V.Y. Synthesis of 6-hydroxy-5,6-dihydro-2-pyrones and -pyridones by reaction of 4-aryl-6-trifluoromethyl-2-pyrones with water, hydrazine, and hydroxylamine. Chem Heterocycl Comp 53, 1294–1301 (2017). https://doi.org/10.1007/s10593-018-2209-y
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DOI: https://doi.org/10.1007/s10593-018-2209-y