3-Substituted 1,2,4-triazines easily react with nitronate anions to replace hydrogen atom in the position C-5 according to nucleophilic substitution mechanism and form appropriate oximes of 5-formyl- or 5-acyl-1,2,4-triazines. Present study has shown that the course of the reaction strongly depends on the structure of the substituent in the position C-3 of 1,2,4-triazine ring. Thus, 2-ethoxyphenyl substituent in 1,2,4-triazine allowed to form, besides appropriate oximes, also new nitronic acid derivatives stabilized by intramolecular hydrogen bonds. The synthesis pathway and molecular structures of oximes were confirmed by X-ray analysis performed for model compound 1-[3-(2-ethoxyphenyl)-1,2,4-triazin-5-yl]ethanone oxime. The presence of the new nitronic acid derivatives in the reaction mixture and the theoretical calculations at DFT/B3LYP/6-311++G(d,p) level strongly suggest that intermediate stabilized by bifurcated intramolecular hydrogen bond is a common intermediate for the construction of appropriate oximes.
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Dedicated to Professor Andrzej Rykowski on the occasion of his 77th birthday
Published in Khimiya Geterotsiklicheskikh Soedinenii, 2019, 55(10), 968–977
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Mojzych, M., Bernat, Z. & Karczmarzyk, Z. Reinvestigation of the reaction of 3-substituted 1,2,4-triazines with nitronate anions: unexpected behavior of 3-(2-ethoxyphenyl)-1,2,4-triazine in the reaction with anions of nitroalkanes. Chem Heterocycl Comp 55, 968–977 (2019). https://doi.org/10.1007/s10593-019-02564-9
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DOI: https://doi.org/10.1007/s10593-019-02564-9