反应详情

温度

-78 °C

To a diethyl ether (150 mL) solution of 5-bromo-2-(4-fluoro-benzyloxy)-pyridine (3.75 g 13.3 mmol) described in Manufacturing Example 58-1-1 was added n-butyl lithium (2.55 M n-hexane solution, 6.26 mL, 16.0 mmol) on a dry ice-ethanol bath (−78° C.) under nitrogen atmosphere, which was stirred for 30 minutes at −78° C. N,N-dimethylformamide (1.54 mL, 20.0 mmol) was then added dropwise and stirred for 5 minutes at −78° C. The reaction solution was allowed to room temperature, water was added, and the solution was extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride, and the solvent was evaporated under a reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:heptane=1:3) to obtain the title compound (2.23 g, 72.5%).

1. stirringstirred for 5 minutes at −78° C
2. customwas allowed to room temperature
3. extractionthe solution was extracted with ethyl acetate
4. washThe organic layer was washed with saturated aqueous sodium chloride
5. customthe solvent was evaporated under a reduced pressure
6. customThe residue was purified by silica gel column chromatography (ethyl acetate:heptane=1:3)