Alkylaromatic 1-hydroxyamino-2-oximes reacted at the hydroxyamino group with glyoxylic acid hydrate, providing 4-aryl(hetaryl)-1-hydroxy-2,5-dihydro-1H-imidazole-2-carboxylic acid 3-oxides that were converted upon heating into 5-aryl(hetaryl)-1-hydroxy-1H-imidazoles containing a hydrogen atom at the heterocycle position 2.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2023, 59(11/12), 752–757
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Nikolaenkova, E.B., Grishchenko, S.Y., Rybalova, T.V. et al. Preparation of 2-unsubstituted 5-aryl(hetaryl)-1-hydroxy-1H-imidazoles from of 4-aryl(hetaryl)-1-hydroxy-2,5-dihydro-1H-imidazole-2-carboxylic acid 3-oxides. Chem Heterocycl Comp 59, 752–757 (2023). https://doi.org/10.1007/s10593-024-03268-5
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DOI: https://doi.org/10.1007/s10593-024-03268-5