The formation of an unexpected heterocyclic scaffold, a benzoxazole, in a three-component reaction between a ketone, isocyanide, and 2-aminophenol was encountered. This reaction involved a benzo[b][1,4]oxazine intermediate resulting from intramolecular attack of the aminophenol hydroxyl group on the nitrilium ion. Unlike previous literature examples, the trapped nitrilium benzo[b][1,4]oxazine could
在酮、异
氰化物和
2-氨基苯酚之间的三组分反应中,遇到了意想不到的杂环支架
苯并恶唑的形成。该反应涉及苯并[ b ][1,4] 恶嗪中间体,该中间体由
氨基
酚羟基对腈离子的分子内攻击产生。与之前的文献实例不同,被捕获的腈基苯并[ b ][1,4]恶嗪可以很容易地与双亲核试剂进行开环。反应范围包括简单的线性以及复杂的环酮和取代的
2-氨基苯酚。具有代表性的
苯并恶唑产品可以进一步多样化以产生类似药物的化合物。