<i>tert</i>-Butyl Bromide-Promoted Intramolecular Cyclization of 2-Arylamino Phenyl Ketones and Its Combination with Cu-Catalyzed C–N Coupling: Synthesis of Acridines at Room Temperature
2-arylamino phenyl ketones is established to supersede the traditional high-temperature, strongly acidic conditions and achieve 9-substituted acridines, by virtue of the combination of 2,2,2-trifluoroethanol and tert-butyl bromide. This protocol can be merged well with the preceding Cu-catalyzed intermolecular Chan–Evans–Lam cross-coupling reactions, therefore enabling pot-economic modular synthesis of 9-substituted
A modular method to synthesize acridinederivatives was developed with o-acylanilines and diaryliodoniumsalts. The reactions proceeded smoothly under Cu-catalyzed or metal-free reaction conditions at elevated temperature through tandemarylation/Friedel–Craftsreactions.