Three-Component Coupling Approach for the Synthesis of Diverse Heterocycles Utilizing Reactive Nitrilium Trapping
作者:András Váradi、Travis C. Palmer、Paula R. Notis、Gabriel N. Redel-Traub、Daniel Afonin、Joan J. Subrath、Gavril W. Pasternak、Chunhua Hu、Indrajeet Sharma、Susruta Majumdar
DOI:10.1021/ol500328t
日期:2014.3.21
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。