反应详情

To a solution of 2-bromo-5-(triisopropylsilyloxy)pyridine (26.6 g) in ether (80 mL) at −78° C. was added n-butyllithium (2.5 M in hexane, 32.2 mL) dropwise. After being stirred at the same temperature for 10 min, a solution of 1-(2-bromo-4-(methoxymethoxy)phenyl)propan-2-one (11 g) in diethylether (40 mL) was added dropwise. The mixture was stirred at −78° C. for 5 hr, and poured into iced saturated ammonium chloride and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (petroleum ether/ethyl acetate) to afford the title compound (9.6 g).

1. stirringThe mixture was stirred at −78° C. for 5 hr
2. extractionextracted with ethyl acetate
3. washThe combined organic layer was washed with brine
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (petroleum ether/ethyl acetate)