1,8-Diazabicyclo(5.4.0)undec-7-ene → 4-(Azidomethyl)-1-[4-(methylsulfonyl)phenyl]-1H-pyrazole

Participants

Reaction Steps

To a solution of [1-(4-methanesulfonyl-phenyl)-1H-pyrazol-4-yl]-methanol (1.80 g, 7.12 mmol, 1.00 equiv) and diphenylphosphoryl azide (2.35 g, 8.54 mmol, 1.2 equiv) in THF (15 mL) at rt was added 1,8-diazabicyclo[5.4.0]undec-7-ene (1.3 g, 8.54 mmol, 1.2 equiv). The resulting solution was stirred overnight, concentrated and chromatographically purified (15% ethyl acetate in hexanes) to give 4-azidomethyl-1-(4-methanesulfonyl-phenyl)-1H-pyrazole (1.90 g, 97%). LCMS: (MH)+=278.0 (1.45 min).

Provenance & Evidence