反应详情

温度

-5 °C

(3S)-3-[3-(tert-Butyldimethylsilyloxy)-1-propyl]-5-oxo-1-[(1R)-1-phenylethyl]pyrrolidine-3-carboxylic acid tert-butyl ester (30 g) was dissolved in tetrahydrofuran (280 mL), and the atmosphere was replaced with argon. Then, lithium hexamethyldisilazide (1.0 M solution in tetrahydrofuran) (78.0 mL) was added dropwise at −15° C., and the mixture was stirred at −5° C. for 30 minutes. After cooling to −15° C. again, a solution of N-fluorobenzenesulfonimide (26.6 g) in tetrahydrofuran (220 mL) was added dropwise, and the mixture was stirred at room temperature for 17 hours. The reaction solution was extracted with a 10% citric acid solution and ethyl acetate. Then, the organic layer was washed with brine, dried over anhydrous sodium sulfate, and filtered. Thereafter, the solvent was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography (hexane:ethyl acetate=9:1→8:2) to give 8.15 g of the title compound as a pale yellow solid.

1. temperatureAfter cooling to −15° C. again
2. stirringthe mixture was stirred at room temperature for 17 hours
3. extractionThe reaction solution was extracted with a 10% citric acid solution and ethyl acetate
4. washThen, the organic layer was washed with brine
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. customThereafter, the solvent was evaporated under reduced pressure