Hydrochloric Acid → 2-(4-Chloro-3-(dibutylcarbamoyl)-5-methyl-1H-pyrazol-1-yl)-5-(naphthalen-2-ylsulfonylcarbamoyl)benzoic acid

Participants

Reaction Steps

To ethyl 2-(4-chloro-3-(dibutylcarbamoyl)-5-methyl-1H-pyrazol-1-yl)-5-(naphthalen-2-ylsulfonylcarbamoyl)benzoate (1.39 g, 2.13 mmol) in THF (12.0 mL) and MeOH (4.0 mL) was added 0.5N aq. NaOH solution (21.3 mL, 10.7 mmol). The resulting reaction mixture was stirred at room temperature for 1.5 h. The mixture was then neutralized with 1N aq. HCl solution (pH=7) and extracted with EtOAc (3×). The combined organic extracts were dried over Na2SO4, filtered and concentrated in vacuo. The crude oil was triturated with CH2Cl2 (3×) to give the title compound (1.04 g, 78%) as a white solid. 1H NMR (DMSO-d6) δ 13.36 (br s, 1H), 8.71 (s, 1H), 8.43 (d, J=2.0 Hz, 1H), 8.26 (d, J=8.1 Hz, 1H), 8.17 (dd, J=8.4, 2.2 Hz, 2H), 8.07 (d, J=8.1 Hz, 1H), 7.99 (dd, J=8.7, 1.9 Hz, 1H), 7.78-7.64 (m, 3H), 3.38 (t, J=7.4 Hz, 2H), 3.29 (t, J=7.4 Hz, 2H), 2.10 (s, 3H), 1.58-1.38 (m, 4H), 1.36-1.22 (m, 2H), 1.13 (dq, J=14.8, 7.4 Hz, 2H), 0.90 (t, J=7.4 Hz, 3H), 0.74 (t, J=7.4 Hz, 3H); MS(ESI+) m/z 625.2 (M+H)+.

Provenance & Evidence