反应详情

Benzothiophene-5-carboxylic acid (2 g, 11.2 mmol, 1 eq) was dissolved in anhydrous THF (50 mL). To the solution was added dropwise tert-BuLi petane solution (1.7M, 20 mL, 3 eq) at −78° C. for 5 minutes under nitrogen atmosphere. The reaction mixture was allowed to warm to room temperature, stirred for 30 minutes, and cooled to −78° C. again, followed by an addition of triisopropyl borate (3.97 mL, 1.5 eq). The reaction was then allowed to warm to room temperature and stirred at that temperature for one hour. To the reaction mixture was added saturated aqueous ammonium chloride (50 mL) and 10% aqueous potassium hydrogensulfate solution (50 mL) to adjust pH to 2. After the mixture was stirred at room temperature for 30 minutes, it was extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate. The upper solution was decanted, concentrated, and the residue was suspended in Hexane/CHCl3/MeOH (40:4:1). The solid was filtered, rinsed with hexane. 2-(dihydroxyboryl)-1-benzothiophene-5-carboxylic acid was obtained as a grayish solid in amount of 1.325 g (53%).

1. temperaturecooled to −78° C. again
2. temperatureto warm to room temperature
3. stirringstirred at that temperature for one hour
4. stirringAfter the mixture was stirred at room temperature for 30 minutes
5. extractionit was extracted with ethyl acetate
6. washThe organic layer was washed with saturated brine
7. dry with materialdried over anhydrous sodium sulfate
8. customThe upper solution was decanted
9. concentrationconcentrated
10. filtrationThe solid was filtered
11. washrinsed with hexane