Short-RInChIKey=SA-FUHFF-UHFFFADPSC-BZGHBVIXED-UHFFFADPSC-NUHFF-NUHFF-NUHFF-ZZZ

(E)-1-Benzyl-3-(3,3-diisopropyltriaz-1-en-1-yl)-1H-pyrazole-4-carbonitrile (367 mg, 1.18 mmol, 1.00 equiv) was dissolved in methylene chloride (22.4 mL). The solution was cooled to 0 °C and then azido(trimethyl)silane (1.02 g, 1.18 mL, 8.86 mmol, 7.50 equiv) and 2,2,2-trifluoroacetic acid (1.35 g, 904 μL, 11.8 mmol, 10.00 equiv) were added. The reaction mixture was slowly warmed to 50 °C while constantly being stirred. The reaction progress was monitored via TLC. After full conversion (16 h), the solvent was reduced under vacuum.