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DOI: 10.1055/a-2623-8823
Novel Synthesis of 3-Amino-2-pyrones and 3-Hydroxy-4-pyridones via Double Ring-Opening Reactions of 4-Pyrone Epoxides with Amines
Funding Information This work was financially supported by the Russian Science Foundation (Grant 22-73-10236, https://rscf.ru/project/22-73-10236/).

Abstract
The general method for the synthesis of 3-amino-2-pyrones based on the domino reaction of 4-pyrone epoxides with amines has been developed. The formation of the products includes selective Michael addition, double ring-opening, and facile deformylation. The nature of amine has a strong effect on the transformation governed by the cyclization of polycarbonyl intermediates. The reaction with aromatic amines is followed by a side dearoylation process to produce dihydropyrroles. The use of ammonium acetate as a nucleophile in DMSO provides a new reaction pathway yielding 3-hydroxy-4-pyridones. Tautomerism of the obtained products has been studied.
Keywords
4-Pyrone epoxide - 3-Amino-2-pyrone - 3-Hydroxy-4-pyridone - Double ring-opening - DeformylationPublication History
Received: 16 March 2025
Accepted after revision: 28 May 2025
Accepted Manuscript online:
28 May 2025
Article published online:
01 August 2025
© 2025. Thieme. All rights reserved.
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