Iron-Catalyzed Synthesis of Polycyclic-Fused Azo[l,2-a]indolones via an SNAr/Acylation Cascade Reactions.

Abstract An efficient method has been developed for the cascade synthesis of azo[l,2-a]indolones from azoles and 2-fluoroaldehydes based on an iron-catalyzed SNAr and a direct acylation reaction. A number of azo[l,2-a]indolones containing different azole rings and substituents were obtained in good yields.