反应详情

Under ice cooling, a 1 M solution (69 ml) of a borane/tetrahydrofuran complex in tetrahydrofuran was added dropwise into a solution of 1-[1-(4-fluorophenethyl)-piperidin-4-yl]-2,3-dioxo-6-bromoindoline (7.4 g) in tetrahydrofuran (150 ml) followed by stirring at room temperature overnight and heating under reflux for 3 hr. Into the reaction solution was carefully added dropwise a saturated aqueous solution of sodium bicarbonate. Then ethyl acetate was added to the resultant mixture and the organic layer was separated. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was then diluted with pyridine (50 ml) and stirred at room temperature for 4 hr. Next, a saturated aqueous solution of sodium bicarbonate and ethyl acetate were added thereto and the layers were separated. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. The residue was purified by silica gel column chromatography (hexane/ethyl acetate system) to give the title compound (3.9 g) as a yellow oil (yield: 57%).

1. temperatureheating
2. temperatureunder reflux for 3 hr
3. customthe organic layer was separated
4. washThe organic layer was washed with brine
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. additionThe residue was then diluted with pyridine (50 ml)
8. stirringstirred at room temperature for 4 hr
9. additionNext, a saturated aqueous solution of sodium bicarbonate and ethyl acetate were added
10. customthe layers were separated
11. washThe organic layer was washed with brine
12. dry with materialdried over anhydrous magnesium sulfate
13. customThe residue was purified by silica gel column chromatography (hexane/ethyl acetate system)