Pd/Cu-Catalyzed aerobic oxidative aromatic C–H bond activation/N-dealkylative carbonylation towards the synthesis of phenanthridinones
作者:Renyi Shi、Huiying Niu、Lijun Lu、Aiwen Lei
DOI:10.1039/c6cc08701a
日期:——
A straightforward Pd/Cu-catalyzed oxidative C–H bond activation/N-dealkylative carbonylation of tertiary [1,1′-biphenyl]-2-anilines towards the synthesis of various biologically important phenanthridin-6(5H)-ones has been developed. A wide range of functional groups are well tolerated in this transformation.
A palladium-catalyzed multicomponentreaction (MCR) involving aryne, CO, and aniline is established for straightforward assembly of a phenanthridinone scaffold through C–H bond activation. Free combination with multiple kinds of readily available anilines and arynes is facilely achieved for phenanthridinone construction without prefunctionalization. Representative natural products were subsequently
[N,P]-pyrrole PdCl<sub>2</sub>complexes catalyzed the formation of dibenzo-α-pyrone and lactam analogues
作者:J. V. Suárez-Meneses、A. Oukhrib、M. Gouygou、M. Urrutigoïty、J.-C. Daran、A. Cordero-Vargas、M. C. Ortega-Alfaro、J. G. López-Cortés
DOI:10.1039/c6dt01022a
日期:——
We herein report the synthesis and catalytic application of a new family of [N,P] ligandsbased on the pyrrole ring with alpha-phosphine or phosphole units. Their palladium complexes (3a–d) were obtained in very good yields and their catalytic properties were evaluated in the direct intramolecular arylation to obtain both benzopyranones and phenanthridinones. The air stable complex 3a exhibited the
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
nitrenium (NHN) salts, the analogues of N-heterocyclic carbenes, have attracted considerable interest. However, relatively little is known about their catalytic ability beyond their Lewis acid catalysis. Herein, we describe that NHNs can serve as catalytic electron acceptors for charge transfer complex photoactivations. We showcase that, under blue light irradiation, the NHN salts could catalyze the