反应详情

Borane-tetrahydrofuran complex (1 M solution in tetrahydrofuran, 20 ml.) was transferred by a syringe to a 100 ml. three-neck flask equipped with a reflux condenser, a nitrogen gas inlet and a rubber septum. The reaction flask was then chilled in a mixture of ice and table salt. α-Hydroxy-β-phenoxy-N-(1-methylethyl)benzenepropanamide (1.9 g.) suspended in tetrahydrofuran (25 ml.) was added slowly keeping the temperature at ca. 0°. The solution thus obtained was brought to reflux and maintained there for 2.5 hours. The reaction mixture was cooled to room temperature, dilute hydrochloric acid (6 N HCl 3 ml.) and water (5 ml.) was added carefully, and the mixture was heated under reflux for 20 minutes. It was then evaporated on a rotary evaporator under reduced pressure to give a solid residue. The residue was treated with water. The water insoluble material was separated by collecting on a filter and washed with water. The filtrate and washings were combined and made alkaline by addition of 50% aqueous sodium hydroxide solution, then extracted with chloroform 3 times. The combined extract was dried over magnesium sulfate, and evaporated under reduced pressure to give an oil which solidified on standing. The crude product was recrystallized from ether and petroleum ether, giving 1.0 g. of product, m.p. 95°-96°.

1. customthree-neck flask equipped with a reflux condenser, a nitrogen gas inlet
2. additionwas added slowly
3. customat ca. 0°
4. customThe solution thus obtained
5. temperatureto reflux
6. temperaturemaintained there for 2.5 hours
7. temperaturethe mixture was heated
8. temperatureunder reflux for 20 minutes
9. customIt was then evaporated on a rotary evaporator under reduced pressure
10. customto give a solid residue
11. customThe water insoluble material was separated
12. customby collecting on
13. filtrationa filter
14. washwashed with water
15. additionby addition of 50% aqueous sodium hydroxide solution
16. extractionextracted with chloroform 3 times
17. extractionThe combined extract
18. dry with materialwas dried over magnesium sulfate
19. customevaporated under reduced pressure
20. customto give an oil which
21. customThe crude product was recrystallized from ether and petroleum ether
22. customgiving 1.0 g