反应详情

温度

-20 °C

A solution (183 mL, 182.79 mmol) of 1M isopropylmagnesium chloride in THF was added dropwise to a solution of 4-bromo-2-fluoro-1-iodobenzene (50.0 g, 166.17 mmol) in anhydrous THF (96 mL) over 20 min at −20° C. under argon atmosphere. The reaction mixture was stirred at −20° C. for 30 min, and added dropwise to a solution of 5-isopropylidene-2,2-dimethyl-1,3-dioxane-4,6-dione in anhydrous toluene (84 mL) over 20 min at −20° C., and then the used container was washed with THF (24 mL). The reaction mixture was stirred at 0° C. for 3 hr, 10% aqueous citric acid solution (200 mL) was added thereto at 0° C., and the mixture was extracted with toluene (200 mL). The organic layer was concentrated under reduced pressure to give 5-(2-(4-bromo-2-fluorophenyl)propan-2-yl)-2,2-dimethyl-1,3-dioxane-4,6-dione as a pale-yellow oil.

1. washthe used container was washed with THF (24 mL)
2. stirringThe reaction mixture was stirred at 0° C. for 3 hr
3. addition10% aqueous citric acid solution (200 mL) was added
4. extractionat 0° C., and the mixture was extracted with toluene (200 mL)
5. concentrationThe organic layer was concentrated under reduced pressure