反应详情

温度

-40 °C

To a solution of 2-acetylisonicotinonitrile (67.1 g, 0.457 mol) in tetrahydrofuran (2400 mL) was added dropwise a solution of methylmagnesium bromide (3.0 M, 167.6 mL, 0.503 mol) in toluene/tetrahydrofuran mixture (3:1) at −40° C. over a period of 2.5 h. The reaction mixture was stirred at −40° C. for another 2 h. A saturated aqueous solution of ammonium chloride (50 mL) was added. The resulting mixture was warmed to room temperature and another 400 mL of a saturated aqueous solution of ammonium chloride was added. The layers were separated and the aqueous layer was extracted with dichloromethane (400 mL×2). The combined organics were dried over sodium carbonate and sodium sulfate and concentrated. The residue was purified via flash chromatography (ethyl acetate/petroleum ether 1:20, 0.3% triethylamine) to afford 2-(2-hydroxypropan-2-yl)isonicotinonitrile (33.0 g, 44.3%).

1. temperatureThe resulting mixture was warmed to room temperature
2. customThe layers were separated
3. extractionthe aqueous layer was extracted with dichloromethane (400 mL×2)
4. dry with materialThe combined organics were dried over sodium carbonate and sodium sulfate
5. concentrationconcentrated
6. customThe residue was purified via flash chromatography (ethyl acetate/petroleum ether 1:20, 0.3% triethylamine)