Short-RInChIKey=SA-FUHFF-UHFFFADPSC-VFSIPNHSCH-UHFFFADPSC-NUHFF-NDGQT-NUHFF-ZZZ

(E)-3-(3,3-Diisopropyltriaz-1-en-1-yl)-1H-pyrazole (461 mg, 2.36 mmol, 1.00 equiv) was dissolved in DMSO (26.0 mL) and cesium carbonate (923 mg, 2.83 mmol, 1.20 equiv) was added. The reaction mixture was cooled to 0 °C and bromocyclopentane (704 mg, 506 μL, 4.72 mmol, 2.00 equiv) was slowly added. After the addition, the reaction mixture was slowly warmed to 21 °C and stirred for 16 hours at this temperature. For work up ice-water was added to the reaction mixture. The aqueous phase was extracted three-times with ethyl acetate and the combined organic phase was washed with water and brine, dried over Na2SO4 and filtered.