Hydrochloric Acid → 3-(2-(4-Fluorophenyl)-3-(methylcarbamoyl)imidazo[1,2-a]pyridin-6-yl)benzoic acid

Participants

Reaction Conditions

Reaction Steps

6-Bromo-2-(4-fluorophenyl)-N-methylimidazo[1,2-a]pyridine-3-carboxamide (150 mg, 0.431 mmol) and 3-boronobenzoic acid (107 mg, 0.646 mmol) were slurried into dioxane (5 mL) and water (1 mL). To the reaction mixture was added Cs2CO3 (211 mg, 0.646 mmol) followed by Pd(PPh3)4 (50 mg, 0.043 mmol). The reaction was sealed and heated at 100° C. overnight. The reaction solution was cooled to rt, filter to remove solids, diluted with water (˜10 mL) and acidified with 1N HCl (aq) (1.5 mL, 1.5 mmol). The white precipitate that formed was collected by filtration, washed with water and dried to yield 3-(2-(4-fluorophenyl)-3-(methylcarbamoyl)imidazo[1,2-a]pyridin-6-yl)benzoic acid (174 mg, 0.335 mmol, 78% yield) as a white solid. 1H NMR (500 MHz, DMSO-d6) δ ppm 13.15 (br s, 1H), 9.01 (s, 1H), 8.25-8.17 (m, 2H), 8.00 (t, J=7.5 Hz, 2H), 7.87 (d, J=8.7 Hz, 1H), 7.86 (d, J=8.6 Hz, 1H), 7.67 (t, J=7.8 Hz, 1H), 7.65-7.59 (m, 1H), 7.59-7.53 (m, 1H), 7.32 (d, J=8.9 Hz, 2H), 2.82 (d, J=4.0 Hz, 3H). LC-MS retention time 1.18 min; m/z 388 (MH−). LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Phenomenex-Luna 10 u C18 4.6×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 5 ml/min, a gradient of 100% solvent A/0% solvent B to 0% solvent A/100% solvent B, a gradient time of 4 min, a hold time of 1 min, and an analysis time of 5 min where solvent A was 5% acetonitrile/95% H2O/10 mM ammonium acetate and solvent B was 5% H2O/95% acetonitrile/10 mM ammonium acetate. MS data was determined using a Micromass Platform for LC in electrospray mode.

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