作者:Quanrui Wang、Qingqing Meng、Hexiang Bai、Zhiming Li、Fenggang Tao
DOI:10.1055/s-2007-966059
日期:2007.6
The novel tricyclic heterocycles of 4,5-dihydro[1,2,4]triazolo[3,2- D][1,5]benzoxazepine derivatives were prepared by the cycloaddition of the corresponding bicyclic cationic 1,3-dipoles, which were easily generated from the azoacetates by reaction with AlCl 3 as a Lewis acid, to the triple bond of nitriles along with the consecutive ring expansion. The formation of products deviating from the normal
4,5-二氢[1,2,4]三唑并[3,2-D][1,5]苯并恶氮杂环衍生物的新型三环杂环化合物是通过相应的双环阳离子1,3-偶极子的环加成反应制备的。偶氮乙酸酯很容易通过与作为路易斯酸的 AlCl 3 反应生成腈的三键以及连续的环扩展。观察到偏离正常反应能力的产物的形成,并在本文中讨论了机理方面。两种产品的晶体衍射分析明确地确定了各自提出的结构。