[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
An effective and eco-friendly oxidation method for the synthesis of benzo[c]chromen-6-ones is described. The condition constitutes 6 molar ratio TBHP, catalytic KI and pyridine in acetonitrile as the solvent. Altogether, 16 structurally diverse substituted benzo[c]chromen-6-ones were prepared through this protocol from corresponding benzo[c]chromenes in excellent yields.
BF<sub>3</sub>·OEt<sub>2</sub>-Promoted Intramolecular Nucleophilic Substitution; Synthesis of Dibenzopyranones and Coumarins from Biaryltriazenes
A simple and highly efficient reaction promoted by Lewis acid has been demonstrated for the synthesis of dibenzopyranones. The metal-free annulation can tolerate a series of functional groups and also allows the synthesis of coumarins and phenanthridinones in good to excellent yields.