Potassium Carbonate → HCID 59320975, compound

Participants

Reaction Steps

A solution of 1-[3-(7-chloro-imidazo[1,2-a]pyridin-3-yl)-phenyl]-3-ethyl urea (200 mg, 0.636 mmol, 1 equivalent, made using procedure F1a), 1-methylpyrazole-4-boronic acid pinacol ester (commercially available, 265 mg, 1.272 mmol, 2 equivalents), potassium carbonate (527 mg, 3.816 mmol, 6 equivalents), and bis(tri-t-butylphosphine)palladium(0) (16 mg, 0.032 mmol, 0.05 equivalents) in ethanol (10 ml), toluene (10 ml) and water (10 ml) was heated at 70° C. for 24 h. The reaction mixture was partitioned between ethyl acetate and water. The organic layer was washed with a saturated brine solution, dried (MgSO4), filtered and the solvent evaporated in vacuo. The residue was purified by column chromatography (Biotage SP4, 25S, flow rate 25 ml/min, gradient 0% to 20% methanol in ethyl acetate) to give 1-ethyl-3-{3-[7-(1-methyl-1H-pyrazol-4-yl)-imidazo[1,2-a]pyridin-3-yl]-phenyl}-urea as a white solid (35 mg). MS: [M+H]+ 361.

Provenance & Evidence