Palladium-Catalyzed C–H Bond Monofluorination of 2-Arylbenzo[d]oxazinone Using Nitrate as Crucial Promoter

Abstract

Monofluorination of 2-arylbenzo[d]oxazinones with N-fluorobenzenesulfonimide (NFSI) was achieved by palladium catalysis in moderate to good yields. Promoted by nitrate, the reaction provides an economic and environmentally friendly strategy. The synthesis of monofluorinated 2-arylbenzo[d]oxazinones has good compatibility with many common functional groups. The plausible mechanism of this monofluorination is discussed.