synthesis of quinoline derivatives by using dioxygen as an oxygen source is developed. By using visible light, the direct oxidativecyclization of aromatic enamines with alkynes or alkenes can be achieved at mild conditions with an aid of copper or palladium catalysts, and a variety of multisubstituted quinoline derivatives could be obtained in good to moderate yields under mild reaction conditions.
A novel copper-catalyzedoxidativecyclization of enynes and in situ formed enynes leading to 4-carbonyl-quinolines by using dioxygen as an oxygen source has been developed.
A synthetic method of highly substituted quinolines has been developed from N-(2-alkynylaryl)enamine carboxylates under Cu-catalyzed aerobic conditions via intramolecular carbo-oxygenation of alkynes. This strategy was further applied for N-alkynylamidines for amino-oxygenation of alkynes, leading to imidazole and quinazoline derivatives.
Mn(OAc)<sub>3</sub>-Mediated One-Pot Condensation-Oxidative Annulation of 2-Alkynylanilines and 1,3-Ketoesters: Synthesis of 2-Substituted Quinolines