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