Silica Functionalized Cu(I) as a Green and Recyclable Heterogeneous Catalyst for the Huisgen 1,3-Dipolar Cycloaddition in Water at Room Temperature

Silica functionalized Cu(I) is reported as a green and recyclable heterogeneous catalyst for the regioselective synthesis of 1,4-disubstituted-1,2,3-triazoles via Huisgen 1,3-dipolar cycloaddition reaction between terminal alkynes, benzyl/allyl/alkyl halides and NaN3 in water at room temperature. The azide intermediate do not need to be isolated, which make this procedure highly economical. Further, silica functionalized Cu(I) could be recovered by simple filtration and recycled up to 7 consecutive runs without loss of significant activity. The catalyst is characterized by FTIR, thermal analysis, SEM, TEM and AAS.