反应详情

To the stirred solution of (S)-tert-butyl (1-((2,6-dimethyl-5-oxo-5,6 dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)-4-methylpentan-2-yl)carbamate (40 mg, 0.069 mmol) in acetonitrile (3 mL) at room temperature was added NBS (12 mg, 0.069 mmol). The reaction mixture was heated to reflux for 2 h. The reaction mixture was diluted with water (50 mL) and extracted with dichloromethane (100 mL). The organic layer was separated, dried over Na2SO4 and concentrated under reduced pressure to afford (S)-tert-butyl (1-((9-bromo-2,6-dimethyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)-4-methylpentan-2-yl)carbamate (30 mg, 0.027 mmol, 40% crude yield) as a yellow oil. The material was carried forward without further purification. LC/MS (ESI) m/e 518.2 [(M+H)+, calcd for C25H33BrN3O4 518.2]; LC/MS retention time (method E): tR=1.25 min.

1. temperatureThe reaction mixture was heated
2. temperatureto reflux for 2 h
3. extractionextracted with dichloromethane (100 mL)
4. customThe organic layer was separated
5. dry with materialdried over Na2SO4
6. concentrationconcentrated under reduced pressure