Novel synthetic routes to nitrogen-bridged tricyclic derivatives of pyrrolo[2,1,5-cd]indolizine and pyrrolo[2,1,5-de]quinolizine derived from 2-acyl-N-(acylmethyl)pyridinium halides
作者:Jiaxin Hu、Xin Jiang、Ting He、Jian Zhou、Yuefei Hu、Hongwen Hu
DOI:10.1039/b102449n
日期:——
routes to nitrogen-bridged derivatives of pyrrolo[2,1,5-cd]indolizine and pyrrolo[2,1,5-de]quinolizine were developed starting from 2-acyl-N-(acylmethyl)pyridinium halides. Thus, 2-benzoyl-N-phenacylpyridinium bromide (1) afforded 3,4-diphenylpyrrolo[2,1,5-cd]indolizines (4) via 1,3-dipolar cycloaddition, to yield 3,5-dibenzoylindolizines (3), followed by intramolecular McMurry coupling. Similarly
氮的桥联衍生物的新型合成路线 pyrrolo [2,1,5- cd ]吲哚利嗪 和 吡咯并[2,1,5- de ]喹诺嗪从2-酰基-N-(酰基甲基)吡啶鎓卤化物开始研发。因此,2-苯甲酰基-N-苯甲酰吡啶鎓溴化物(1),得到3,4-二苯基[2,1,5- CD ]中氮茚(4)通过 1,3-偶极环加成,得到3,5-二苯甲酰吲哚并咪唑(3),随后进行分子内McMurry偶联。相似地,2-(1,3-二氧戊环-2-基)-N-苯甲酰吡啶鎓溴化物(5)给3-苯基吡咯并[2,1,5- cd ]吲哚嗪(7)与意外的产物3-苯基-4-羟基吡咯并[2,1,5- cd ]吲哚并嗪(8)。然而,2-乙酰基-N-苯甲酰吡啶鎓溴化物 (13)或2-苯甲酰基-N-丙酮基溴化吡啶鎓(16)发生了串联反应。醛醇缩合 和 1,3-偶极环加成形成3-苯基-5 H-吡咯并[2,1,5- de ]喹啉嗪-5-酮(15)或5-苯基-3