反应详情

温度

80 °C

To a suspension of 2-Hydroxynicotinic acid (1.01 g, 7.26 mmol) in THF (2 mL) was added BH3.THF (1.0 m in THF, 18 mL, 18 mmol) and the mixture was heated to 80° C. for 18 hours. MeOH (2 mL) was added and the mixture was heated to 80° C. for an additional 2 hours before being cooled to room temperature and concentrated under reduced pressure. The resultant crude syrup was repeatedly dissolved in MeOH (5 mL) and concentrated (3×). Purification by column chromatography on silica gel (20:1—CH2Cl2:MeOH) afforded the desired alcohol (260 mg, 29%) as a white solid. 1H NMR (CD3OD) δ 4.50 (s, 2H), 6.43 (t, 1H, J=6.6 Hz), 7.34 (d, 1H, J=4.5 Hz), 7.65 (d, 1H, J=6.3 Hz).

1. temperaturethe mixture was heated to 80° C. for an additional 2 hours
2. temperaturebefore being cooled to room temperature
3. concentrationconcentrated under reduced pressure
4. dissolutionThe resultant crude syrup was repeatedly dissolved in MeOH (5 mL)
5. concentrationconcentrated (3×)
6. customPurification by column chromatography on silica gel (20:1—CH2Cl2:MeOH)