A two-step synthesis of 6-(5-isoxazolyl)coumarins was developed. Recyclization of 7-hydroxychromones by hydroxylamine into 4-(5-isoxazolyl)-1,3-benzenediols followed by condensation with acetoacetic ester produced 6-(5-isoxazolyl)-4-methylumbelliferone derivatives with aryl and hetaryl substituents on the isoxazole ring.
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Translated from Khimiya Prirodnykh Soedinenii, No. 4, July–August, 2017, pp. 547–549.
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Shokol, T.V., Gorbulenko, N.V., Frasinyuk, M.S. et al. Synthesis of 6-Isoxazolyl Derivatives of 4-Methylumbelliferone. Chem Nat Compd 53, 642–645 (2017). https://doi.org/10.1007/s10600-017-2080-6
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DOI: https://doi.org/10.1007/s10600-017-2080-6