Palladium-Catalyzed Site-Selective Benzocylization of Aromatic Acids with o -Fluoro-Substituted Diaryliodonium Salts toward 3,4-Benzocoumarins

Organic Letters
Cheng PanJianwei Han

Abstract

By using 2-fluoro-substituted diaryliodonium salts, a novel benzocylization has been accomplished for the synthesis of 3,4-benzocoumarin derivatives via a cascade of ortho-arylation and defluorination in the presence of palladium catalysts. The reaction exhibits a broad compatibility of readily available aromatic acids with an excellent level of site-selectivity. Mechanistic investigations revealed a unique reactivity of carboxylic acid directed arylation by followed nucleophilic substitution of aromatic fluoride in the present system.

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