Synthesis of 4-quinolones, benzopyran derivatives and other fused systems based on the domino ANRORC reactions of (ortho-fluoro)-3-benzoylchromones

Herein we reported a transition metal free strategy for the synthesis of 4-quinolones, benzopyran derivatives and other fused systems by the domino reaction of 3-benzoyl-chromones, containing a leaving group in the position-2 of the benzoyl moiety, with aliphatic amines, anilines and different binucleophiles. The developed strategy is suitable for a broad range of substrates, namely according to the applied nucleophile the reaction provides different final products with excellent chemoselectivity. The mechanistic studies resulted in the detection and isolation of several intermediates.