反应详情

(Step 1) To (S)-3-hydroxydihydrofuran-2(3H)-one (0.5 mL, 6.41 mmol), dichloromethane (6.4 mL), triethylamine (1.34 mL, 9.62 mmol), tert-butyldimethylsilylchloride (1.06 g, 7.07 mmol), and DMAP (39 mg, 0.321 mmol) were added, and the resulting mixture was stirred at room temperature for 3 hours. To the reaction mixture, a saturated aqueous ammonium chloride solution was added, and the resulting mixture was extracted with ethyl acetate. The organic layer was dried over sodium sulfate, and the solvent was evaporated under reduced pressure. To the obtained residue, methanol (11 mL) and sodium methoxide (331 mg, 6.13 mmol) were added, and the resulting mixture was stirred at 50° C. for 2.5 hours. The reaction mixture was cooled to room temperature, and a saturated aqueous ammonium chloride solution was added thereto, and then, the resulting mixture was extracted with ethyl acetate. The organic layer was dried over sodium sulfate, and the solvent was evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=0/100 to 30/70), whereby methyl (S)-2-(tert-butyldimethylsiloxy)-4-hydroxybutanoate (225 mg, 14%) was obtained.

1. extractionthe resulting mixture was extracted with ethyl acetate
2. dry with materialThe organic layer was dried over sodium sulfate
3. customthe solvent was evaporated under reduced pressure
4. stirringthe resulting mixture was stirred at 50° C. for 2.5 hours
5. temperatureThe reaction mixture was cooled to room temperature
6. extractionthe resulting mixture was extracted with ethyl acetate
7. dry with materialThe organic layer was dried over sodium sulfate
8. customthe solvent was evaporated under reduced pressure
9. customThe resulting residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=0/100 to 30/70)