反应详情

To a mixture of 2-aminophenol (27 25 g), sodium hydrogencarbonate (31.5 g), ethyl acetate (250 ml), and water (200 ml), a solution of 2-bromo-3-methylbutyryl chloride (49.8 g) in ethyl acetate (100 ml) was added dropwise with ice-cooling and with stirring. After stirring with ice-cooling for further 1 hour, the ethyl acetate layer was separated, washed with water, and dried (MgSO4), and the solvent was evaporated off. The residue was crystallized from hexane, to give 2-(2-bromo-3-methylbutyryl)aminophenol. Yield was 59.7 g (87.9%). Recrystallization from isopropyl ether gave colorless prisms, mp 110°-111° C.

1. temperaturecooling
2. stirringAfter stirring with ice-
3. temperaturecooling for further 1 hour
4. customthe ethyl acetate layer was separated
5. washwashed with water
6. dry with materialdried (MgSO4)
7. customthe solvent was evaporated off
8. customThe residue was crystallized from hexane