反应详情

The compound (6.57 g, 25.6 mmol) obtained in step A was dissolved in tetrahydrofuran (100 ml), and the mixture was stirred under ice-cooling. Then, a suspension of lithium aluminum hydride (1.94 g, 51.2 mmol) in tetrahydrofuran (50 ml) was slowly added dropwise. Thereafter, the mixture was stood overnight at room temperature. The reaction mixture was ice-cooled again, water (2 ml), 1N aqueous sodium hydroxide solution (4 ml) and water (2 ml) were added in this order with stirring, and the mixture was stirred at room temperature for 5 hr. The insoluble material was filtered off through celite, and the obtained solution was concentrated under reduced pressure to give the title compound (4.56 g, yield 74%) as a yellow oil.

1. temperaturecooling
2. additionwas slowly added dropwise
3. temperaturecooled again
4. stirringwith stirring
5. stirringthe mixture was stirred at room temperature for 5 hr
6. filtrationThe insoluble material was filtered off through celite
7. concentrationthe obtained solution was concentrated under reduced pressure