反应详情

Concentrated hydrochloric acid (0.3 ml) was added to a solution of methyl 2-bromoimidazo[5,1-b]thiazole-7-carboxylate (54 mg, 0.21 mmol) in propionic acid (2 ml), and the mixture was heated under reflux for 11 hr. The reaction solution was neutralized with a 2 M aqueous solution of sodium hydroxide and was extracted with ethyl acetate (7 ml×3). The organic layer was washed with saturated brine and was dried over anhydrous sodium sulfate. The solvent was removed by distillation under the reduced pressure. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=1:2) to give 2-bromoimidazo[5,1-b]thiazole (12 mg, 28%) as a white solid.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 11 hr
3. extractionwas extracted with ethyl acetate (7 ml×3)
4. washThe organic layer was washed with saturated brine
5. dry with materialwas dried over anhydrous sodium sulfate
6. customThe solvent was removed by distillation under the reduced pressure
7. customThe residue was purified by column chromatography on silica gel (hexane:ethyl acetate=1:2)