反应详情

To a mixture of 1-(2-phenoxyphenyl)thiourea (53.4 g) in chloroform (100 ml) was added dropwise a solution of bromine (35.0 g) in chloroform (50 ml) with stirring under ice-cooling during 40 minutes. After refluxing for 1 hour and 40 minutes, the mixture was cooled to ambient temperature. To the resultant mixture was added water and then the mixture was alkalified with 5% sodium hydroxide aqueous solution. The chloroform layer was washed with water, dried over magnesium sulfate, concentrated under reduced pressure to give crystals, which were recrystallized twice from isopropyl alcohol to give 2-amino-4-phenoxybenzothiazole (25.8 g).

1. temperaturecooling during 40 minutes
2. temperatureAfter refluxing for 1 hour and 40 minutes
3. washThe chloroform layer was washed with water
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customto give crystals, which
7. customwere recrystallized twice from isopropyl alcohol