An Efficient Protocol for Facile Synthesis of New 5-Substituted-1 H -Tetrazole Derivatives Using Copper-Doped Silica Cuprous Sulfate (CDSCS) as Heterogeneous Nano-Catalyst

摘要

A facile and highly efficient protocol for synthesis of new 5-substituted-1 H -tetrazoles derivatives using copper-doped silica cuprous sulfate (CDSCS) is described. In this method, the cycloaddition reaction of sodium azide with structurally diverse nitriles involving bioactive N -heterocyclic cores exploiting CDSCS in refluxing H 2 O/ i -PrOH (1:1, v/v) furnishes the corresponding 5-substituted-1 H -tetrazoles in good to excellent yields (up to 93%). The influence of parameters effective in progress of reaction including solvent type, temperature and catalyst was studied and discussed. In this protocol, CDSCS was proved to be an efficient heterogeneous nano-catalyst to easily achieve the new tetrazole derivatives. The advantages of CDSCS in current protocol known are its cheapness, thermal and chemical stability, ease of recyclability and reusability for several consecutive runs without significant decline in its reactivity.