Syntheses of indolo[3,2,1-d,e]phenanthridines and isochromeno[3,4-a] carbazoles: palladium catalyzed intramolecular arylation via C–H functionalization
作者:Ezhumalai Yamuna、Matthias Zeller、Karnam Jayarampillai Rajendra Prasad
DOI:10.1016/j.tetlet.2011.09.018
日期:2011.11
A new synthetic route has been developed for the preparation of indolo[3,2,1-d,e]phenanthridines and isochromeno[3,4-a]carbazoles via palladium catalyzed intramolecular biaryl coupling reactions. The coupling reactions proceeded smoothly and in high yields under ligand-free conditions with the catalytic system Pd(OAc)2/Cs2CO3/TBAB. Under optimized reaction conditions no halogen-reduced products were
已开发出一种新的合成路线,用于通过钯催化的分子内联芳基偶合反应制备吲哚[3,2,1- d,e ]菲啶和异色素[3,4- a ]咔唑。在无配体条件下,采用催化体系Pd(OAc)2 / Cs 2 CO 3 / TBAB进行偶联反应,反应平稳,收率高。在优化的反应条件下,未观察到卤素还原的产物。