Difficult-to-access 4-bromo quinolines are constructed directly from easily prepared ortho-propynol phenyl azides using TMSBr as acid-promoter. The cascade transformation performs smoothly to generate desired products in moderate to excellent yields with good functional groups compatibility. Notably, TMSBr not only acted as an acid-promoter to initiate the reaction, and also as a nucleophile. In addition
使用 TMSBr 作为酸
促进剂,从容易制备的邻
丙炔苯基
叠氮化物直接构建难以获得的
4-溴喹啉。级联转化顺利进行,以中等至优异的产率生成所需的产物,并具有良好的官能团兼容性。值得注意的是,TMSBr 不仅充当酸
促进剂以引发反应,而且还充当亲核试剂。此外,作为关键中间体的
4-溴喹啉可以进一步进行偶联反应或亲核反应,以提供多种在
喹啉C4位具有分子多样性的官能化化合物。