Potassium Carbonate → [7-Fluoro-3-(1-methyl-1h-pyrazol-4-yl)-quinolin-6-yl]acetic acid

Participants

Reaction Steps

Nitrogen gas was bubbled through a suspension of (3-bromo-7-fluoro-quinolin-6-yl)-acetic acid (5 g, 17.7 mmol), 1-methyl-4-pyrazoleboronic acid pinacol ester (3.86 g, 18.6 mmol), potassium carbonate (7.3 g, 53 mmol) in 1,4-dioxane (50 mL) and water (20 mL) for 10 minutes. After such time dichlorobis(triphenylphosphine)palladium (II) (248 mg, 0.35 mmol) was added and the mixture heated to reflux for 3 hours. The aqueous phase was removed via pipette, diluted with 2N aqueous potassium carbonate (15 mL) and washed with ethyl acetate (2×30 mL). The aqueous phase was then acidified to pH 3 with concentrated hydrochloric acid. The formed precipitate was collected via filtration and washed with water and dried to return the title compound as a white solid (4.2 g, 14.7 mmol, 83% yield). 1H NMR 500 MHz (DMSO-d6): δ 3.84 (2H, s), 3.92 (3H, s), 7.71 (1H, d), 7.90 (1H, d), 8.10 (1H, s), 8.39 (1H, s), 8.47 (1H, d), 9.18 (1H, d). ES-MS m/z: 286 (M+H+).

Provenance & Evidence