4-Substituted 1-(N-sulfonyl)-1,2,3-triazoles are selectively obtained by using the Cu-catalyzed azide–alkyne cycloaddition reaction with sulfonyl azides. Performing the reaction at 0 °C in chloroform in the presence of 2,6-lutidine and CuI as the catalyst effectively prevents the ketenimine pathway and provides convenient access to N-sulfonyltriazoles in good to excellent yields.
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