Generation of oxodiazonium ions 2. Synthesis of benzotetrazine-1,3-dioxides from 2-(tert-butyl-NNO-azoxy)-N-nitroanilines
作者:M. S. Klenov、V. P. Zelenov、A. M. Churakov、Yu. A. Strelenko、V. A. Tartakovsky
DOI:10.1007/s11172-011-0310-9
日期:2011.10
A new method for the synthesis of benzotetrazine-1,3-dioxides was developed, which involves the reaction of 2-(tert-butyl-NNO-azoxy)-N-nitroanilines with the Ac2O/H2SO4 system. This method was also used for the synthesis of [1,2,5]oxadiazolo[3,4-c]cinnoline-5-oxide from 3-nitramino-4-phenylfurazan. The suggested mechanism of these reactions involves the formation of the intermediate oxodiazonium ion, resulting from acetylation of the oxygen atom of the nitramine group, followed by protonation and ionic dissociation. Then the oxodiazonium ion enters the intramolecular reaction with the neighboring tert-butyl-NNO-azoxy or phenyl group to form the corresponding heterocyclic systems.
开发了一种合成苯并四嗪-1,3-二氧化物的新方法,该方法涉及 2-(叔丁基-NNO-氮氧)-N-硝基苯胺与 Ac2O/H2SO4 系统的反应。这种方法还被用于从 3-硝基氨基-4-苯基呋咱合成 [1,2,5]噁二唑并[3,4-c]噌啉-5-氧化物。这些反应的机理是,硝胺基团的氧原子乙酰化后形成中间体氧二氮离子,然后质子化和离子解离。然后,氧二氮离子与邻近的叔丁基-NNO-氮氧基或苯基发生分子内反应,形成相应的杂环系统。