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We report a method for directed ortho-arylation of N-aryl pyrazoles with arylboronic acids. Reactions proceeded in the presence of a Co(hfacac)2 catalyst, CeSO4 oxidant, and HFIP solvent. Functionalities such as nitro, ester, bromo, and ketone groups were compatible with the reaction conditions. Using heterocycles including thiophene and carbazole was also feasible.

Graphical abstract: Cobalt-catalyzed, directed arylation of C–H bonds in N-aryl pyrazoles

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