N-bromobutanimide → (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

Participants

Reaction Steps

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.

Provenance & Evidence