反应详情

温度

-78 °C

To a suspension of 2,5-dibromopyridine in toluene (12 mL/mmol) cooled to −78° C. was added n-butyllithium 2.5M in hexanes (1.05 eq) and the resulting mixture was stirred in the cold for 2.5 hours. Acetone (2 eq) was added and stirring was continued for 1.5 h. After quenching with saturated aqueous ammonium chloride solution, the mixture was warmed to room temperature and partitioned between ethyl acetate and water. The product from the organic phase was chromatographed on silica gel eluting with 20% ethyl acetate in hexane to afford the 5-bromo-2-(1-hydroxy-1-methylethyl) pyridine compound as a syrup.

1. stirringstirring
2. waitwas continued for 1.5 h
3. customAfter quenching with saturated aqueous ammonium chloride solution
4. temperaturethe mixture was warmed to room temperature
5. custompartitioned between ethyl acetate and water
6. customThe product from the organic phase was chromatographed on silica gel eluting with 20% ethyl acetate in hexane