Cu-Catalyzed Multicomponent\nReaction of Arylhydrazines\nwith β‑Ketoesters and TBN: One-Pot Access to <i>N</i><sup>2</sup>‑Aryl 1,2,3-Triazole-1-Oxides

We report a copper-catalyzed one-pot,\nmulticomponent\nstrategy for\nthe convenient synthesis of <i>N</i><sup>2</sup>-aryl 1,2,3-triazole-1-oxides\nusing arylhydrazines, β-ketoesters, and <i>tert</i>-butyl nitrite. This mild and simple reaction proceeds in an atom-economic\nmanner with broad substrate scope, affording a variety of <i>N</i><sup>2</sup>-aryl 1,2,3-triazole-1-oxide derivatives. Other\nsalient features of the reaction are good functional group tolerance,\nscalability, and product diversification.