Bimetallic Cu/Pd-catalyzed three-component azide–alkyne cycloaddition/isocyanide insertion: synthesis of fully decorated tricyclic triazoles

Abstract

The construction of fully decorated 1,2,3-triazole-fused 5-, 6- and 7-membered rings has been disclosed via a bimetallic relay-catalyzed cascade process combining azide–alkyne cycloaddition, C(sp²)–H functionalization of intermediary 1,2,3-triazoles and isocyanide insertion. The salient features of this methodology include simple starting materials, reduced synthetic steps, good substrate scope and high efficiency.