palladium‐catalyzed regiodivergent C1 insertion multicomponent reaction involving aryne, CO, and 2‐iodoaniline is established to construct the scaffolds of phenanthridinone and acridonealkaloids. Regioselective control is achieved under the guidance of selective ligands. The phenanthridinones are solely obtained under ligand‐free condition. In comparison, application of the electron‐abundant bidentate ligand dppm
Palladium-catalyzed annulation of benzynes with N-substituted-N-(2-halophenyl)formamides: synthesis of phenanthridinones
作者:Yuan Yang、Hui Huang、Lijun Wu、Yun liang
DOI:10.1039/c4ob00997e
日期:——
A novel and efficient procedure for the synthesis of N-substituted phenanthridinones via palladium-catalyzed annulation of benzynes with N-substituted-N-(2-halophenyl)formamides has been developed. This methodology constructs two new C–C bonds via an arylation/annulation process, and provides the desired products in good yields.
A series of phenanthridin-6-(5H)-ones were synthesized through a palladium-catalyzed C-H activation/cyclization strategy using diazonium salts in good yields. The best conditions included Pd(OAc)(2) as the catalyst, PPh3 as the ligand, toluene as the solvent, K2CO3 as the base and 60 degrees C as the optimal temperature.
<b>A Simple General Approach to Phenanthridinones via Palladium-Catalyzed Intramolecular Direct Arene Arylation</b>
Phenanthridinone derivatives have been prepared in good to high yields via palladium-catalyzed cyclization of readily available N-benzyl-N-benzoyl-o-iodoanilides.