DBU catalyzed metal free synthesis of fused 1,2,3-triazoles through [3+2] cycloaddition of aryl azides with activated cyclic C-H acids

DBU catalyzed synthesis of fused 1,2,3-triazoles by [3+2] cycloaddition of aryl azides with activated cyclic C-H acids such as dimedone, cyclohexane-1,3-dione, 5-methylcyclohexane-1,3-dione, and 2-hydroxynaphthalene-1,4-dione in PEG-400 has been reported under heating. The important features of this reaction are high yield products, short reaction times, easy availability of starting materials, and recyclability of both reaction medium and catalyst. (C) 2016 Elsevier Ltd. All rights reserved.