反应详情

温度

-78 °C

To a tetrahydrofuran (150 mL) solution of 2-(4-bromo-benzyloxy)-5-methyl-pyridine (5.40 g, 19.4 mmol) described in Manufacturing Example 44-1-1 was added dropwise n-butyl lithium (2.67 M n-hexane solution, 8.73 mL, 23.3 mmol) on a dry ice-ethanol bath (−78° C.) under nitrogen atmosphere, which was stirred for 30 minutes at −78° C. N,N-dimethylformamide (2.99 mL, 38.8 mmol) was then added dropwise thereto, which was stirred for 10 minutes at −78° C. Water was added to the reaction solution at room temperature, which was then extracted with ethyl acetate. The organic layer was separated and 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=1:6→1:4) to obtain the title compound (2.93 g, 66.5%).

1. stirringwhich was stirred for 10 minutes at −78° C
2. extractionwhich was then extracted with ethyl acetate
3. customThe organic layer was separated
4. washwashed 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=1:6→1:4)