反应详情

温度

80 °C

500 mg of ethyl 6-bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 21A; 1.18 mmol; 1 equivalent), 131 mg of cyclopropaneboronic acid (1.53 mmol, 1.3 equivalents), 873 mg of potassium phosphate (4.12 mmol, 3.5 equivalents), 33 mg of tricyclohexylphosphine (0.12 mmol, 0.1 equivalents) and 13 mg of palladium(II) acetate (0.059 mmol, 5 mol %) were initially charged in 10.5 ml of toluene/water 20:1 and stirred at 80° C. for 16 h. The mixture was then filtered through silica gel and concentrated. The residue was chromatographed on a 50 g silica gel cartridge (Biotage Isolera, cyclohexane/ethyl acetate gradient as mobile phase). This gave 473 mg of a yellowish solid (98% pure, quantitative yield).

1. filtrationThe mixture was then filtered through silica gel
2. concentrationconcentrated
3. customThe residue was chromatographed on a 50 g silica gel cartridge (Biotage Isolera, cyclohexane/ethyl acetate gradient as mobile phase)