15862-46-1

73183-34-3

1201645-46-6

General procedure: 3-acetamido-5-bromopyridine (0.23 mol, 58.42 g), bis(pinacolato)diboron (0.23 mol, 58.42 g) and potassium acetate (0.69 mol, 67.62 g) were added sequentially to a 1 L four-necked round-bottomed flask equipped with a magnetic stirrer, a thermometer, a reflux condenser and a nitrogen bulb apparatus, followed by 450 mL of dioxane as solvent. Ferrocene palladium chloride (0.0051 mol, 3.80 g) was added to the reaction system as a catalyst under nitrogen protection. The reaction mixture was heated to 100 °C and the reaction was stirred at this temperature for 18-24 h. The progress of the reaction was monitored by thin layer chromatography (TLC) until the reaction was complete. After completion of the reaction, it was cooled to room temperature and the precipitated solid was separated by pulping and filtration. The solid was dissolved in 500 mL of methanol, filtered and the solvent was evaporated to dryness. Finally, heptane was added for pulping to obtain the target product 3-acetamido-pyridine-5-boronic acid pinacol ester 55.40 g in 92.1% yield.