metal-free protocol for the synthesis of indenoquinolinones and 2-substituted quinolinesvia [4 + 2] cycloaddition reaction using readily available 2-aminobenzaldehydes and ketones as starting materials. Different quinoline derivatives can be selectively synthesized by changing the type of ketones. O2 and dimethyl sulfoxide (DMSO) as co-oxidants play an important role in the synthesis of indenoquinolinones
Inverse Electron Demand Diels Alder Reaction of Aza-<i>o</i>-Quinone Methides and Enaminones: Accessing 3-Aroyl Quinolines and Indeno[1,2-<i>b</i>]quinolinones