反应详情

To a mixture of 2-bromo-6-methoxypyridine (500 mg, 2.66 mmol) and toluene (20 mL) was added dropwise n-butyl lithium (1.84 mL, 1.6 M hexane solution, 2.93 mmol) at −78° C., which was stirred for 30 minutes. N,N-dimethylformamide (412 μA, 5.32 mmol) was added dropwise to the mixture at the same temperature, which was stirred for 45 minutes at 0° C. Water and tetrahydrofuran were added to the reaction solution and vigorously stirred. The organic layer was separated, washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and filtered. Sodium borohydride (201 mg, 5.31 mmol) was added to this filtrate at 0° C., which was stirred for 2 hours at room temperature. Water was added to the reaction solution, which was then exacted with ethyl acetate. The organic layer was separated, washed with saturated aqueous sodium chloride, dried with anhydrous magnesium sulfate, and then dried. This filtrate was concentrated under a reduced pressure, and the residue was purified by NH silica gel column chromatography (hexane: diethyl ether=2:1) to obtain the title compound (104.8 mg, 28%).

1. stirringwas stirred for 45 minutes at 0° C
2. stirringvigorously stirred
3. customThe organic layer was separated
4. washwashed with water and saturated aqueous sodium chloride
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltered
7. stirringwhich was stirred for 2 hours at room temperature
8. customThe organic layer was separated
9. washwashed with saturated aqueous sodium chloride
10. dry with materialdried with anhydrous magnesium sulfate
11. customdried
12. concentrationThis filtrate was concentrated under a reduced pressure
13. customthe residue was purified by NH silica gel column chromatography (hexane: diethyl ether=2:1)