Progress in the Synthesis of Fused 1,2,3-Triazoles

Fused heterocycles display prodigious prominence in diverse field ranging from medicinal chemistry to material science and chemical biology to catalysis. Owing to biological importance, fused 1,2,3-triazoles have gained much attention and hence, enormous efforts on its synthesis is given by the chemists. Diverse functionalized fused polycyclic 1,2,3-triazole heterocycles have been designed using Huisgen's thermal intramolecular cycloaddition, copper catalyzed cycloaddition, bimetallic catalytic, greener and other miscellaneous approaches. Novel methodologies that use modified substrates such as ketones, enals, beta-keto esters, olefins, enones, C-H acids etc. in place of alkynes have been developed. Herein, synthetic methodologies to construct fused 1,2,3-triazoles are briefly discussed.