反应详情

To a stirred solution of compound 68a (7.5 g, 0.032 mol) in THF (100 mL), 1 M THF solution of NaHMDS (36 mL, 0.036 mol) was added dropwise at 0 C. The resulting solution was allowed to warm to room temperature and stirred for 1 h before cooling back down to 0° C. The cooled reaction mixture was treated dropwise with iodomethane (5.1 g, 0.035 mol). The ice-water bath was removed and stirring was continued for an additional hour at room temperature. The reaction was then quenched by the addition of water (50 mL). The reaction mixture was extracted with EtOAc (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and the filtrate was concentrated under reduced pressure to afford compound 68b as a yellow oil. Mass Spectrum (GCMS, ESI pos.): Calcd. for C10H11BrO2: 242.0 (M). found: 242.0.

1. temperaturebefore cooling back down to 0° C
2. customThe cooled reaction mixture
3. customThe ice-water bath was removed
4. stirringstirring
5. waitwas continued for an additional hour at room temperature
6. customThe reaction was then quenched by the addition of water (50 mL)
7. extractionThe reaction mixture was extracted with EtOAc (3×100 mL)
8. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
9. filtrationfiltered
10. concentrationthe filtrate was concentrated under reduced pressure