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

HRID 1398429Notes

Reaction equation

HRID 1398429 reaction equation
[CH3:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][N:11]=1)[C:8](=[O:12])[N:7]([CH3:13])[C:6]1[CH:14]=[C:15]([O:18][CH2:19][C@@H:20]([NH:25][C:26](=[O:32])[O:27][C:28]([CH3:31])([CH3:30])[CH3:29])[CH2:21][CH:22]([CH3:24])[CH3:23])[CH:16]=[CH:17][C:5]2=1.C1C(=O)N([Br:40])C(=O)C1>C(#N)C.O>[Br:40][C:16]1[C:15]([O:18][CH2:19][C@@H:20]([NH:25][C:26](=[O:32])[O:27][C:28]([CH3:30])([CH3:29])[CH3:31])[CH2:21][CH:22]([CH3:24])[CH3:23])=[CH:14][C:6]2[N:7]([CH3:13])[C:8](=[O:12])[C:9]3[C:4]([C:5]=2[CH:17]=1)=[CH:3][C:2]([CH3:1])=[N:11][CH:10]=3

Participants

5

Reactant 2

HCID 67184N-bromobutanimideHCID 86710415(S)-tert-butyl (1-((2,6-dimethyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)-4-methylpentan-2-yl)carbamate

Product 1

HCID 86710416(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)carbamateYield 39.1%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6342AcetonitrileSolvent

Procedure

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.

Workup

  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

Sources & evidence

ORD record
ord-8f26966905a64b7d8251c88ebf120cd7
Source dataset
uspto-grants-2014_12
Patent number
US08901305B2

Reaction notes

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