反应详情

温度

-78 °C

5,6-Dichloro-9-tosyl-2,3,4,9-tetrahydro-1H-carbazol-1-one (intermediate 5b) (0.15 g, 0.036 mmol) was dissolved in dry THF, cooled to −78° C. and LiHMDS (0.8 mL, 0.88 mmol, 1M solution in THF) was added dropwise. The reaction mixture was slowly warmed to 0° C. and stirred for an additional 30 min. The reaction mixture was cooled to −78° C. and MeI (0.05 ml, 0.88 mmol) was added slowly, and the reaction mixture was slowly, warmed to room temperature and stirred for 4 h. The reaction was cooled to 0° C. and quenched with saturated NH4Cl (10 mL) and extracted with EtOAc (2×50 ml). The combined organic extracts were dried over Na2SO4 and concentrated under reduced pressure. The crude material obtained was purified by column chromatography using [EtOAc-hexane (1:9) as eluant] to afford the title compound (0.05 g, 32%). 1H NMR (500 MHz, CDCl3, δ in ppm) 8.22 (d, J=8.5 Hz, 1H), 8.02 (d, J=8.5 Hz, 2H), 7.54 (d, J=9 Hz, 1H), 7.34 (d, J=8.5 Hz, 2H), 3.55-3.49 (m, 1H), 3.22-3.15 (m, 1H), 2.68-2.64 (m, 1H), 2.42 (s, 3H), 2.27-2.22 (m, 1H), 1.95-1.87 (m, 1H), 1.25-1.17 (m, 3H).

1. temperatureThe reaction mixture was slowly warmed to 0° C.
2. temperatureThe reaction mixture was cooled to −78° C.
3. temperaturewarmed to room temperature
4. stirringstirred for 4 h
5. temperatureThe reaction was cooled to 0° C.
6. customquenched with saturated NH4Cl (10 mL)
7. extractionextracted with EtOAc (2×50 ml)
8. dry with materialThe combined organic extracts were dried over Na2SO4
9. concentrationconcentrated under reduced pressure
10. customThe crude material obtained
11. customwas purified by column chromatography