反应详情

A solution of diisopropylamine (6.8 ml) in tetrahydrofuran (75 ml) was cooled to −78° C. under argon atmosphere, and thereto was added dropwise n-butyl lithium (1.59 M hexane solution, 30.5 ml). The reaction mixture was stirred at the same temperature for 30 minutes, and thereto was added dropwise a solution of 3-chloro-2-thiophenecarboxylic acid (3.92 g) in tetrahydrofuran (40 ml). The mixture was stirred at the same temperature for 30 minutes, and thereto was added dropwise 1,2-dibromo-1,1,2,2-tetrafluoroethane (6.0 ml). The mixture was stirred at the same temperature for one hour, and then, warmed to room temperature. The mixture was poured into a diluted aqueous hydrochloric acid solution, and the solution was extracted with ethyl acetate. The extract was washed with brine, and dried over sodium sulfate. The solvent was evaporated under reduced pressure and the residue was crystallized from a mixed solvent of diisopropyl ether and hexane to give 5-bromo-3-chloro-2-thiophenecarboxylic acid (3.79 g) as a yellow solid. ESI-Mass m/Z 239/241 (M−H).

1. stirringThe mixture was stirred at the same temperature for 30 minutes
2. stirringThe mixture was stirred at the same temperature for one hour
3. extractionthe solution was extracted with ethyl acetate
4. washThe extract was washed with brine
5. dry with materialdried over sodium sulfate
6. customThe solvent was evaporated under reduced pressure
7. customthe residue was crystallized from a mixed solvent of diisopropyl ether and hexane