反应详情

To a hot (80° C.) solution of 4-(1H-pyrazol-3-yl)pyridine (9.6 g) in 2-propanol (60 mL) was added benzyl bromide (20 mL, 2.5 equiv.) and the resulting mixture heated at reflux for 10 minutes. After cooling in an ice bath, the precipitate was filtered and washed with more 2-propanol and air dried. The solid was suspended in ethanol at 0° C. and sodium borohydride (13 g) was added in several portions over 30 minutes, and the mixture was stirred for an additional 30 minutes. The reaction was quenched by carefully addition of water, and the ethanol was removed by evaporation, and the residue was partitioned between dichloromethane and water. The organic layer was dried over MgSO4, and filtrated and evaporation gives 1-benzyl-4-(1H-pyrazol-3-yl)-1,2,3,6-tetrahydropyridine (16 g)

1. temperaturethe resulting mixture heated
2. temperatureat reflux for 10 minutes
3. temperatureAfter cooling in an ice bath
4. filtrationthe precipitate was filtered
5. washwashed with more 2-propanol and air
6. customdried
7. customwas suspended in ethanol at 0° C.
8. additionsodium borohydride (13 g) was added in several portions over 30 minutes
9. customThe reaction was quenched by carefully addition of water
10. customthe ethanol was removed by evaporation
11. customthe residue was partitioned between dichloromethane and water
12. dry with materialThe organic layer was dried over MgSO4
13. filtrationfiltrated
14. customevaporation