Tributylphosphine → {4-[4-Cyclopropyl-2-(2-trifluoromethoxy-phenyl)-2H-pyrazol-3-ylmethoxy]-2-methyl-phenyl}-carbamic acid tert-butyl ester

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Reaction Steps

Tri-n-butylphosphine (1.9 mL, 7.5 mmol) and azodicarboxylic acid dipiperidine (1.90 g, 7.54 mmol) are added to a mixture of [4-cyclopropyl-2-(2-trifluoromethoxy-phenyl)-2H-pyrazol-3-yl]-methanol (1.50 g, 5.03 mmol), (4-hydroxy-2-methyl-phenyl)-carbamic acid tert-butyl ester (1.35 g, 6.03 mmol) and toluene at room temperature. After 1 h, additional tri-n-butylphosphine (0.6 mL) is added and the mixture is stirred for 2 h. The mixture is concentrated and the residue is purified by flash chromatography (20 to 50% EtOAc/heptane) to give the title compound (1.92 g, 76%). LC-ES/MS m/e 504.2 (M+1).

Provenance & Evidence