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The article focuses on the application of tandem decarboxylation/carbon-hydrogen activation in the palladium-catalyzed intramolecular direct arylation of Benzoic acids. It notes that direct arylation nonactivated arene reactions attract more and more attention. Experiment shows that dibenzofurans are formed in good yields through optimized and simple catalyst system with proto-decarboxylation control.

N-Heterocyclic carbene (NHC)-catalyzed transformations have found increasing interest in the last years. Recently, dual catalytic approaches using NHCs in combination with a second catalyst such as another organocatalyst or a metal-based catalyst or by the NHC itself have emerged. The careful choice of the proper combination of catalysts allows two compatible yet independent catalytic systems in one-pot to undergo tandem processes. Moreover, simultaneous action of two activators in a bond-forming event enables new reactivity, which often cannot be achieved by monocatalytic approaches [ABSTRACT FROM AUTHOR]