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

HRID 1410698Notes

Reaction equation

HRID 1410698 reaction equation
[CH3:1][O:2][C:3]([C:5]1[C:6]([OH:30])=[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]([CH2:23][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)=[CH:8]2)=[O:4].[Br:31]N1C(=O)CCC1=O>>[CH3:1][O:2][C:3]([C:5]1[C:6]([OH:30])=[C:7]2[C:12](=[C:13]([Br:31])[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]([CH2:23][C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=1)=[CH:8]2)=[O:4]

Participants

3

Reactant 2

HCID 67184N-bromobutanimideHCID 682973641,3-Dibenzyl-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

Product 1

HCID 867141071,3-Dibenzyl-8-bromo-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl esterYield 79.7%

Procedure

A mixture of 1,3-dibenzyl-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (470 mg, 1.18 mmol) and N-bromosuccinimide (220 mg, 1.23 mmol) was refluxed for 3 h. After the mixture was cooled to r.t., solvent was evaporated in vacuo. The residue was chromatographed (0-30% EtOAc/hexanes+2% AcOH) to give 451 mg of the title compound. MS: (+) m/z 479.06, 480.88 (M+1, 79/81Br)

Workup

  1. temperaturewas refluxed for 3 h
  2. customsolvent was evaporated in vacuo
  3. customThe residue was chromatographed (0-30% EtOAc/hexanes+2% AcOH)

Sources & evidence

ORD record
ord-17e054225f724eccb361cfd584d98c55
Source dataset
uspto-grants-2014_12
Patent number
US08921389B2

Reaction notes

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