105 degrees C. Under these conditions an unprecedented reaction sequence occurs leading to condensed pyridones in 23-86% yield. The proposed pathway proceeds through palladacycle-catalyzed homocoupling of the bromoamide, followed by intramolecular carbon-nitrogen bond-formingreaction with the carbon atom bearing the aminocarbonyl group, which is easily eliminated under palladium catalysis.
Ni‐Catalyzed Divergent Synthesis of 2‐Benzazepine Derivatives via Tunable Cyclization and 1,4‐Acyl Transfer Triggered by Amide N‐C Bond Cleavage
作者:Yuanyuan Ping、Xiao Li、Qi Pan、Wangqing Kong
DOI:10.1002/anie.202201574
日期:2022.6.20
Ni-catalyzed ligand-controlled tunable cyclization/cross-couplings was developed for the divergent synthesis of pharmacologically important 2-benzazepine frameworks. The bidentate ligand facilitates the formation of 2-benzazepin-5-ones and benzo[c]pyrano[2,3-e]azepines. The tridentate ligand promotes the formation of 2-benzazepin-3-ones.
6-Phenanthridinones and their heterocyclic analogues were synthesized through a one-pot procedure based on consecutive Pd-catalyzed aryl-aryl and N-aryl coupling from iodoarenes ortho-substituted by electron-releasing substituents and amides of o-bromoarene- and heteroarenecarboxylic acids.