N-bromobutanimide → 1-Benzyl-8-bromo-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

HRID 919685Notes

Reaction equation

HRID 919685 reaction equation
[CH3:1][O:2][C:3]([C:5]1[C:6]([OH:29])=[C:7]2[C:12](=[CH:13][N:14]=1)[N:11]([CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[C:10](=[O:22])[C:9]([C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1)=[CH:8]2)=[O:4].[Br:30]N1C(=O)CCC1=O>C(Cl)Cl>[CH3:1][O:2][C:3]([C:5]1[C:6]([OH:29])=[C:7]2[C:12](=[C:13]([Br:30])[N:14]=1)[N:11]([CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[C:10](=[O:22])[C:9]([C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1)=[CH:8]2)=[O:4]

Participants

4

Reactant 2

HCID 67184N-bromobutanimideHCID 682973581-Benzyl-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

Product 1

HCID 867141061-Benzyl-8-bromo-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl esterYield 77.6%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of 1-benzyl-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (600 mg, 1.55 mmol) and N-bromosuccinimide (291 mg, 1.63 mmol) in CH2Cl2 (4.2 mL) was refluxed for 3 h. After the mixture was cooled to r.t., the solvent was evaporated in vacuo. The residue was purified by silica gel chromatography (0-60% EtOAc/hexanes+2% AcOH) to give 560 mg of the title compound as a yellow solid. MS: (+) m/z 464.97, 466.94 (M+H, 79/81Br)

Workup

  1. temperaturewas refluxed for 3 h
  2. customthe solvent was evaporated in vacuo
  3. customThe residue was purified by silica gel chromatography (0-60% EtOAc/hexanes+2% AcOH)

Sources & evidence

ORD record
ord-09ba1e47d83b48bcb0eb5f3b24d781de
Source dataset
uspto-grants-2016_03
Patent number
US09271970B2

Reaction notes

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