Tandem C‑2 Functionalization–Intramolecular Azide–Alkyne 1,3‑Dipolar Cycloaddition Reaction: A Convenient Route to Highly Diversified 9<i>H</i>‑Benzo[<i>b</i>]pyrrolo[1,2‑<i>g</i>][1,2,3]triazolo[1,5‑<i>d</i>][1,4]diazepines

An efficient diversity-oriented synthetic approach to annulated 9<i>H</i>-benzo­[<i>b</i>]­pyrrolo­[1,2-<i>g</i>]­[1,2,3]­triazolo­[1,5-<i>d</i>]­[1,4]­diazepines has been developed using a Sc­(OTf)₃-catalyzed two-component tandem C-2 functionalization–intramolecular azide–alkyne 1,3-dipolar cycloaddition reaction. The reaction shows high substrate tolerance and provides a library of fused heterocycles that may lead to novel biologically active compounds or drug lead molecules