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

(E)-1-(3,5-difluorobenzyl)-3-(3,3-diisopropyltriaz-1-en-1-yl)-1H-pyrazole-4-carbonitrile (730 mg, 2.11 mmol, 1.00 equiv) was dissolved in methylene chloride (50.0 mL). The solution was cooled to 0 °C and then azido(trimethyl)silane (1.82 g, 2.10 mL, 15.8 mmol, 7.50 equiv) and 2,2,2-trifluoroacetic acid (2.40 g, 1.61 mL, 21.1 mmol, 10.0 equiv) were added. The reaction mixture was slowly warmed to 50 °C while constantly being stirred. The reaction progress was monitored via LC-MS. The reaction was finished after 7 days of stirring at 50 °C.