反应详情

温度

0 °C

A solution of (S)-tert-butyl 1-(3,3-difluorocyclobutyl)-4-methyl-3-oxopent-4-en-2-ylcarbamate (0.80 g, 2.6 mmol) in DMF (20 mL) was cooled to 0° C. and 10% aqueous NaClO solution (7.90 mL, 10.6 mmol) was added while keeping the internal temperature below 5° C. The reaction mixture was stirred for 1 h at 0° C. and poured into saturated aqueous sodium bicarbonate (50 mL). The resulting mixture was extracted with EtOAc (50 mL×3). The organic extracts were combined, washed with brine (100 mL×2), dried over anhydrous sodium sulfate, and concentrated. The residue was purified by flash column chromatography on silica gel (petroleum ether/EtOAc=200:1 to 50:1) to afford tert-butyl ((S)-3-(3,3-difluorocyclobutyl)-1-((R)-2-methyloxiran-2-yl)-1-oxopropan-2-yl)carbamate (510 mg, 62% yield). 1H NMR (300 MHz, CDCl3): δ 5.02 (d, J=8.7 Hz, 1H), 4.25 (m, 1H), 3.23 (d, J=4.5 Hz, 1H), 2.93 (d, J=4.8 Hz, 1H), 2.73 (m, 2H), 2.25 (m, 3H), 1.92 (m, 1H), 1.55 (m, 1H), 1.54 (s, 3H), 1.43 (s, 9H). MS (EI) for C15H23F2NO4, found 358.14 [M+K]+.

1. customthe internal temperature below 5° C
2. extractionThe resulting mixture was extracted with EtOAc (50 mL×3)
3. washwashed with brine (100 mL×2)
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated
6. customThe residue was purified by flash column chromatography on silica gel (petroleum ether/EtOAc=200:1 to 50:1)