Sulfuric Acid → HCID 10275412, compound

Participants

Reaction Steps

Part H. To 3-[3-cyano-1-(4-methoxyphenyl)-1H-pyrazol-5-yl]-2-[2-fluoro-4-(2-oxo-1(2H)-pyridinyl)phenyl]-3-oxopropanoate (100 mg, 0.210 mmol) was added methyl alcohol (1.5 mL) and 4M aqueous dihydrogen sulfate (0.50 mL). The reaction was then warmed to reflux. After 4 days, the reaction was cooled to 23° C., and the resulting white suspension was poured into saturated aqueous hydrogen carbonate (50 mL) and ethyl acetate (50 mL). The layers were separated and the aqueous layer was washed with ethyl acetate (3×25 mL). The combined organic layers were washed with saturated aqueous sodium chloride, dried over sodium sulfate, and concentrated to afford 5-{[2-fluoro-4-(2-oxo-1(2H)-pyridinyl)phenyl]acetyl}-1-(4-methoxyphenyl)-1-H-pyrazole-3-carbonitrile (75 mg, 85%) as a pale yellow oil. LC/MS (ESI+): 429.0 (M+H)+. Part I. To 5-{[2-fluoro-4-(2-oxo-1(2H)-pyridinyl)-phenyl]acetyl)-1-(4-methoxyphenyl)-1H-pyrazole-3-carbonitrile (75 mg, 0.175 mmol) was added concentrated aqueous dihydrogen sulfate (4.5 mL). After 2 h, the reaction was poured into ethyl acetate (50 mL) and water (50 mL), and the layers were separated. The organic layer was washed with saturated aqueous sodium chloride (50 mL), dried over sodium sulfate, and concentrated to dryness. The resulting residue was purified by radial chromatography (2% methyl alcohol in dichloromethane) to afford 5-{[2-fluoro-4-(2-oxo-1(2H)-pyridinyl)phenyl]acetyl}-1-(4-methoxyphenyl)-1H-pyrazole-3-carboxamide (32 mg, 41%) as a white solid upon lyopholization from 10% acetonitrile in water. LC/MS (ESI+): 448.2 (M+H)+. 1H NMR (CD3OD) δ 7.70 (s, 1H), 7.60 (m, 2H), 7.43 (t, 1H), 7.16–7.32 (m, 4H), 6.97 (d, 2H), 6.60 (d, 1H), 6.45 (t, 1H), 4.40 (s, 2H), 3.83 (s, 3H).

Provenance & Evidence