Sulfuric Acid → 2-Amino-5-[2-(2-methoxy-ethyl)-2H-pyrazol-3-yl]-4-trifluoromethyl-benzoic acid methyl ester

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Reaction Steps

2-Acetylamino-5-[2-(2-methoxy-ethyl)-2H-pyrazol-3-yl]-4-trifluoromethyl-benzoic acid methyl ester (352 mg, 0.913 mmol) was treated with MeOH containing 10% of concd H2SO4 (10 mL) and the resultant solution was stirred at 70° C. for 2 h. The solvents were removed in vacuo and the residue was dissolved into water. The pH was adjusted to 10-11 by addition of 2N aq NaOH. The aqueous phase was extracted with AcOEt (2×). The organic phases were combined, dried (Na2SO4) and concentrated in vacuo to afford the title compound (238 mg, 76%). ES-MS: m/z 344.3 [M+H]+, rt 5.52 min.

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