Method for synthesizing 4,5-diphenyl-1,4,5-trihydro-1,2,3-triazole

The invention discloses a method for synthesizing 4,5-diphenyl-1,4,5-trihydro-1,2,3-triazole. The method comprises the following steps of firstly mixing 1,2-diphenyl-acrylonitrile, potassium carbonate, sodium azide, cuprous iodide and dimethyl sulfoxide DMSO, stirring and heating to 95-105 DEG C, reacting for 3-3.5 hours, after the reaction is completed, adding water to obtain a mixture, extracting the mixture, distilling to remove the solvent, purifying the residue by column chromatography to obtain 4,5-diphenyl-1,4,5-trihydro-1,2,3-triazole, wherein the feeding molar ratio of 1,2-diphenyl-acrylonitrile, potassium carbonate, sodium azide and cuprous iodide is 1:2:2:0.2. The reaction time and the reaction temperature adopted in the invention are more suitable reaction time and temperature, too high temperature, the ratio of reaction byproducts too high, if the temperature is too low, the reaction cannot be carried out; if the reaction time is shortened, the incomplete reaction can be caused and the reaction time is prolonged, the yield of the byproducts is high.