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A facile and broadly applicable method for the regiospecific N‐arylation of benzotriazoles is reported. Copper‐mediated reactions of diverse 1‐hydroxy‐1H‐benzotriazoles with aryl boronic acids lead to 1‐aryl‐1H‐benzotriazole 3‐oxides. A N1‐OH→N3 prototropy in the 1‐hydroxy‐1H‐benzotriazoles is plausibly the underlying basis, where the tautomer is captured by the boronic acid, leading to C−N (not C−O)...
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