反应详情

To a mixture of 2-bromo-5-({[tert-butyl(dimethyl)silyl]oxy}methyl)pyridine (11 g) and tetrahydrofuran (450 mL) was added n-butyllithium (1.6 M hexane solution, 25.3 mL) at −78° C., and the reaction mixture was stirred for 1 hr. Then, N,N-dimethylformamide (3.17 mL) was added at −78° C., and the temperature of the mixture was raised to room temperature and stirred for 16 hr. The reaction mixture was diluted with diethyl ether, washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The obtained residue was dissolved in methanol (200 mL), sodium borohydride (1.95 g) was added at 0° C., and the reaction mixture was stirred at room temperature for 2 hr. The solvent was evaporated under reduced pressure, and the obtained residue was extracted with saturated aqueous ammonium chloride solution and ethyl acetate. The ethyl acetate layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography to give the title compound as colorless crystals (7.53 g, 64%).

1. stirringstirred for 16 hr
2. washwashed with saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. customThe solvent was evaporated under reduced pressure
5. dissolutionThe obtained residue was dissolved in methanol (200 mL)
6. additionsodium borohydride (1.95 g) was added at 0° C.
7. stirringthe reaction mixture was stirred at room temperature for 2 hr
8. customThe solvent was evaporated under reduced pressure
9. extractionthe obtained residue was extracted with saturated aqueous ammonium chloride solution and ethyl acetate
10. washThe ethyl acetate layer was washed with saturated brine
11. dry with materialdried over anhydrous magnesium sulfate
12. customThe solvent was evaporated under reduced pressure
13. customthe residue was purified by silica gel column chromatography