**Abstract**

The regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles derivatives from substituted alkynes and organic halides with sodium azide by using CuI catalyst in polyethylene glycol-400 as a green reaction media. This process is of considerable synthetic advantages in terms of green principles, high atom economy, low environmental impact, mild reaction condition, high purity and good yields. We find out the use of eco-friendly solvent like mixture of PEG-400 and water for the synthesis of 1,2,3-triazole. The main aim of this research is to found the method which required very short time, cost effective, feasible and a green method as compared to known reported for synthesis of 1,2,3-triazole as a medicinally important scaffold by click chemistry.

**Keywords:** PEG-400, multicomponent reactions, 1,2,3-triazole, CuI
