Synthesis of Benz-fused Azoles via C-Heteroatom Coupling Reactions Catalysed by Cu(I) in presence of Glycosyltriazole Ligands.

Glycosyl triazoles are conveniently accessible and contain multiple metal-binding units that may assist in metal-mediated catalysis. Azide derivatives of D-glucose have been converted to their respective aryltriazoles and screened as ligands for the synthesis of 2-substituted benz-fuzed azoles and benzimidazoquinazolinones by Cu-catalyzed intramolecular Ullmann type C-heteroatom coupling. Good to excellent yields for a variety of benz-fused heterocyles were obtained for this readily accessible catalytic system.