Palladium-catalyzed reductive N-heterocyclization of alkenyl-substituted nitroarenes as a viable method for the preparation of bicyclic pyrrolo-fused heteroaromatic compounds
作者:Sobha P. Gorugantula、Grissell M. Carrero-Martínez、Shubhada W. Dantale、Björn C.G. Söderberg
DOI:10.1016/j.tet.2010.01.029
日期:2010.3
Palladium-catalyzed, carbon monoxide-mediated reductive N-heterocyclization of nitro-heteroaromatic compounds having an alkene adjacent to the nitro-group affords bicyclic pyrrolo-fused heteroaromatic molecules. This type of reaction was used to prepare the fused bicyclo[3.3.0] ring-system: thieno[3,2-b]pyrrole, thieno[2,3-b]pyrrole, furo[2,3-b]pyrrole, pyrrolo[3,2-d]thiazole, and pyrrolo[2,3-d]imidazole
钯催化的,具有与硝基相邻的烯烃的硝基-杂芳族化合物的一氧化碳介导的还原性N-杂环化提供了双环吡咯并稠合的杂芳族分子。此类反应用于制备稠合的双环[3.3.0]环系统:噻吩并[3,2- b ]吡咯,噻吩并[2,3- b ]吡咯,呋喃[2,3- b ]吡咯,吡咯并[3,2- d ]噻唑,吡咯并[2,3- d ]咪唑和双环[4.3.0]环系统:吡咯并[3,2- b ]吡啶,吡咯并[2,3- b ]吡啶,吡咯并[3,2- c ]吡啶,吡咯并[2,3- c ]吡啶,吡咯并[3,2- c ]哒嗪和吡咯并[3,2-d ]嘧啶,收率32–94%。