Hydrochloric Acid → HCID 15380230, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl[4-(4-fluorophenyl)-3-[4-(methylsulfonyl)phenyl]-1H-pyrazol-1-yl]acetate from Step 1 (1.05 g, 2.6 mmol) in THF (20 mL) was added 3.0 mL of aqueous 1N lithium hydroxide at 25° C. under nitrogen and the mixture stirred at 25° C. for 24 hours. The mixture was acidified with 2N HCl, extracted with two portions ethyl acetate and the organic layer separated, washed with brine, dried over MgSO4 and concentrated in vacuo. chromatographic purification on silica gel using 20% ethanol/79% chloroform/1% acetic acid as the eluant gave [4-(4-Fluorophenyl)-3-[4-(methylsulfonyl)phenyl]-1H-pyrazol-1-yl]acetic acid as a white solid (0.58 g, 60%). Elemental analysis for C18H15N2FSO4 +0.8 CH3CO2H Calc'd: C, 55.73, H, 4.34, N, 6.63, S, 7.59. Found: C, 55.72, H, 4.35, N, 6.74, S, 7.72.

Provenance & Evidence