Hydrochloric Acid → 2-{[3-tert-butyl-1-(2-methylphenyl)-1H-pyrazol-5-yl]amino}-5-ethylbenzoic acid

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Reaction Conditions

Reaction Steps

To a solution of methyl 2-{[3-tert-butyl-1-(2-methylphenyl)-1H-pyrazol-5-yl]amino}-5-ethylbenzoate (Example 235, 115 mg, 0.29 mmol) in a mixture of methanol (1 mL) and THF (1 mL) was added lithium hydroxide monohydrate (123 mg, 2.94 mmol) in water (2 mL), and the mixture was heated to 40° C. for 1 h. The reaction mixture was then cooled to rt, and the pH of the solution was adjusted to 5 using 0.5 N aq HCl. The solvent was removed under reduced pressure, and the residue was subjected to HPLC purification using gradient elution from 10% to 90% acetonitrile in water to afford 109.6 mg (99%) of the title compound. 1H NMR (300 MHz, CD2Cl2) δ 9.28 (s, 1H), 7.76 (s, 1H), 7.26-7.37 (m, 6H), 6.15 (s, 1H), 2.60 (q, 2H), 2.08 (s, 3H), 1.37 (s, 9H), 1.23 (t, 3H). ES-MS m/z 378.3 (MH+); HPLC RT (min) 3.64.

Provenance & Evidence