Sulfuric Acid → HCID 10298942, compound

Participants

Reaction Conditions

Reaction Steps

Part A. To methyl 2-[2-fluoro-4-(2-oxo-1(2H) -pyridinyl)phenyl]-3-[1-(4-methoxyphenyl)-3-(trifluoro-methyl)-1H-pyrazol-5-yl]-3-oxopropanoate (Part H, Example 71) (24 mg, 0.045 mmol) was added methyl alcohol (2.3 mL) and concentrated aqueous dihydrogen sulfate (0.048 mL). The reaction was then warmed to reflux. After 48 h, monitoring by LC/MS (C18 reverse phase, eluted with 0.05% TFA in acetonitrile/water) showed 90% of starting material remaining. An additional 0.80 mL-portion of 4M aqueous dihydrogen sulfate was added, and the reaction was maintained under reflux conditions for 6 h. The reaction was cooled to 0° C., and the resulting white precipitate was filtered to afford 1-(3-fluoro-4-{2-[1-(4-methoxyphenyl)-3-(trifluoromethyl)-1H-pyrazole-5-yl]-2-oxoethyl}phenyl)-2(1H)-pyridinone (11 mg, 52%) as a white solid. LC/MS (ESI+): 472.1 (M+H)+. 1H NMR (enol form) (CD3OD) δ 7.70 (s, 1H), 7.60 (m, 2H), 7.43 (t, 1H), 7.28 (m, 3H), 7.20 (m, 1H), 6.98 (m, 2H), 6.62 (d, 1H), 6.44 (t, 1H), 4.42 (s 0.5H), 4.39 (br s, 0.5H), 3.81 (s, 3H).

Provenance & Evidence