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
作者:Mariusz Mojzych、Zofia Bernat、Zbigniew Karczmarzyk
DOI:10.1007/s10593-019-02564-9
日期:2019.10
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
根据亲核取代机理,3-取代的1,2,4-三嗪容易与亚硝酸根阴离子反应以取代C-5位的氢原子,并形成合适的5-甲酰基-或5-酰基-1,2,4-肟。三嗪。目前的研究表明,反应的过程很大程度上取决于1,2,4-三嗪环C-3位的取代基的结构。因此,除了合适的肟外,在1,2,4-三嗪中的2-乙氧基苯基取代基还可以形成通过分子内氢键稳定的新的硝酸衍生物。通过对模型化合物1- [3-(2-乙氧基苯基)-1,2,4-三嗪-5-基]乙酮肟的X射线分析证实了肟的合成途径和分子结构。