Water → 5-(benzyloxy)-6-(N-ethylmethylsulfonamido)-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridine-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Ethyl 5-(benzyloxy)-6-(N-ethylmethylsulfonamido)-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridine-3-carboxylate (0.15 g, 0.29 mmol, 1 eq) was dissolved in ethanol. Then sodium hydroxide (0.035 g, 1.17 mmol, 3 eq) was added, followed by the addition of water (1 ml). The reaction was warmed to 45° C. for 14 h. The solution was concentrated and diluted with water and the pH of the reaction was brought to 3 using Conc.HCl. The solid precipitated was filtered and dried under vacuum. Yield: 0.12 g (86%). 1HNMR (400 MHz, DMSO-d6): δ 1.06-1.10 (t, J=7.14 Hz, 3H), 3.01 (s, 3H), 3.62 (m, 2H), 5.34 (s, 2H), 7.27 (t, J=8.9 Hz, 2H), 7.32-7.46 (m, 4H), 7.56 (d, J=7.0 Hz, 2H), 7.63 (s, 1H), 7.80 (t, J=4.77 Hz, 2H), 8.98 (s, 1H). LCMS: (ES+) m/z=484.0 (M+H).

Provenance & Evidence