反应详情

Into a solution of 1,3-dihydroindol-2-thione (19.7 g) and ethyl 2-bromo-2-phenylpropionate (33.9 g) indimethylformamide (DMF, 200 ml), an aqueous 2 N sodium hydroxide solution (66 ml) was added dropwise under ice cooling, and the mixture was stirred at room temperature for 2 hours. The reaction mixture was diluted with water, and was extracted with ethyl acetate. The organic layer was washed with water, and then with saturated aqueous sodium chloride solution, and was dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. n-Hexane was added to the evaporation residue to cause crystallization. The resulting crystalline matter was recrystallized from ethyl acetate/n-hexane to give 30.3 g (yield: 71%) of product compound as a pale yellow crystal form. The melting point was 97°-99° C.

1. extractionwas extracted with ethyl acetate
2. washThe organic layer was washed with water
3. dry with materialwith saturated aqueous sodium chloride solution, and was dried over anhydrous sodium sulfate
4. customThe solvent was evaporated under reduced pressure
5. additionn-Hexane was added to the evaporation residue
6. customcrystallization
7. customThe resulting crystalline matter was recrystallized from ethyl acetate/n-hexane