Facile and Quantitative Synthesis of 1,3-Diazaheterocycle-Fused 1,2,3-Triazole Derivatives Using Fluoroalkanesulfonyl Azide as a Diazo Transfer Reagent

A series of 1,3-diazaheterocycle-fused 1,2,3-triazoles were conveniently and quantitatively prepared by 1,3-dipolar cycloaddition of heterocyclic ketene aminals with fluoroalkanesulfonyl azide, followed by elimination of fluoroalkanesulfonyl amide at room temperature without any catalyst.