Stereoselective Synthesis of Pyrroloquinolines by a Brønsted Acid Catalyzed [4+2]-Heterocyclization of Indole-7-Carbaldehydes, Anilines and Electron-Rich Alkenes
作者:Alicia Galván、Raquel Fontaneda、Francisco J. Fañanás、Félix Rodríguez
DOI:10.1002/adsc.201600154
日期:2016.6.2
diastereoselective tetrafluoroboric acid (HBF4)‐catalyzed three‐component coupling reaction of 1H‐indole‐7‐carbaldehyde derivatives, anilines and electron‐rich alkenes to give pyrrolo[3,2,1‐ij]quinolines is described. The reaction involves an unusual [4+2]‐heterocyclization between an in situ formed imine and an alkene. The new catalytic method, where water is the only by‐product, is efficient, robust
在具有有趣应用的多种化合物的结构中发现了吡咯并[3,2,1- ij ]喹啉杂环核,因此,需要新的有效且灵活的策略来构建该骨架。在此,描述了一种新的非对映选择性四氟硼酸(HBF 4)催化的1 H-吲哚-7-甲醛醛衍生物,苯胺和富含电子的烯烃的三组分偶联反应,得到吡咯并[3,2,1- ij ]喹啉。该反应涉及原位形成的亚胺和烯烃之间异常的[4 + 2]-杂环化。在水是唯一副产物的情况下,这种新的催化方法是高效,稳健和灵活的,并且可以进行多克级合成。