反应详情

温度

0 °C

To a solution of 5,6-dichloro-9-tosyl-2,3,4,9-tetrahydro-1H-carbazol-1-one (300 mg, 0.7 mmol) in anhydrous THF (10 mL), cooled to −78° C., LiHMDS (1.47 mL, 1.4 mmol, 1M solution in THF) was added slowly. The reaction mixture was slowly warmed to 0° C. and stirred for an additional 30 min. while maintaining the temperature at 0° C. The reaction mixture was then cooled to −78° C. and N-fluoro benzene sulfonamide (0.22 g, 0.9 mmol), dissolved in THF (3 mL), was added dropwise. The reaction mixture was slowly warmed to 0° C. and stirred for 15 min during which time the reaction was complete. The reaction was quenched with saturated NH4Cl and extracted with EtOAc (3×25 mL). The combined organic extracts were dried over Na2SO4 and concentrated under reduced pressure to give the crude compound which was purified by column chromatography [EtOAc-hexane (1:9) as eluant] to give the title compound (100 mg, 32%). 1H NMR (500 MHz, CDCl3, δ in ppm) 8.27 (d, J=9.5 Hz, 1H), 8.07 (d, J=8.5 Hz, 2H), 7.59 (d, J=9.5 Hz, 1H), 7.35 (d, J=8.5 Hz, 2H), 5.30-5.13 (m, 1H), 3.71-3.66 (m, 1H), 3.35-3.28 (m, 1H), 2.58-2.55 (m, 1H), 2.43 (s, 3H), 2.40-2.38 (m, 1H)

1. temperaturewhile maintaining the temperature at 0° C
2. temperatureThe reaction mixture was then cooled to −78° C.
3. additionwas added dropwise
4. temperatureThe reaction mixture was slowly warmed to 0° C.
5. stirringstirred for 15 min during which time the reaction
6. customThe reaction was quenched with saturated NH4Cl
7. extractionextracted with EtOAc (3×25 mL)
8. dry with materialThe combined organic extracts were dried over Na2SO4
9. concentrationconcentrated under reduced pressure
10. customto give the crude compound which
11. customwas purified by column chromatography [EtOAc-hexane (1:9) as eluant]