Methanol → alpha-Methyl-3-pyridinemethanol

Into a 500-mL flask to which a nitrogen gas introduction tube, thermometer, and Dimroth condenser had been attached were introduced 21.29 g (0.141 mol) of the methyl 3-pyridylacetate obtained above and 250 mL of anhydrous methanol. The contents were stirred at room temperature. The atmosphere in the flask was replaced with nitrogen, and 15.62 g (0.372 mol) of sodium borohydride was added to the contents little by little. The resultant mixture was heated and reacted for further 3.5 hours with refluxing. Thereafter, the liquid reaction mixture was cooled to room temperature, and 100 mL of water was added thereto to hydrolyze the excess sodium borohydride remaining unreacted. The methanol was distilled away under vacuum. Thereafter, an extraction operation using 100 mL of chloroform was conducted twice, and the resultant organic phase was washed with 100 mL of saturated aqueous sodium chloride solution and dried by adding anhydrous sodium sulfate thereto. The anhydrous sodium sulfate was removed by decantation. Thereafter, vacuum distillation was conducted to obtain 12.59 g (0.102 mol) of 3-pyridylethanol.

1. additionwas added to the contents little by little
2. customreacted for further 3.5 hours
3. temperaturewith refluxing
4. customThereafter, the liquid reaction mixture
5. temperaturewas cooled to room temperature
6. distillationThe methanol was distilled away under vacuum
7. washthe resultant organic phase was washed with 100 mL of saturated aqueous sodium chloride solution
8. customdried
9. additionby adding anhydrous sodium sulfate
10. customThe anhydrous sodium sulfate was removed by decantation
11. distillationThereafter, vacuum distillation

ORD 기록

ord-1f994c70a37e47ce80329089d74215a2

출처 데이터셋

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US08445731B2