Beta-Alanine → 3-[(1,3-Dibenzyl-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carbonyl)-amino]-propionic acid

HRID 920055Notes

Reaction equation

HRID 920055 reaction equation
CO[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].[NH2:31][CH2:32][CH2:33][C:34]([OH:36])=[O:35].C[O-].[Na+]>C([O-])(O)=O.[Na+]>[CH2:15]([N:11]1[C:12]2[C:7](=[C:6]([OH:30])[C:5]([C:3]([NH:31][CH2:32][CH2:33][C:34]([OH:36])=[O:35])=[O:4])=[N:14][CH:13]=2)[CH:8]=[C:9]([CH2:23][C:24]2[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=2)[C:10]1=[O:22])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1

Participants

5

Reactant 3

HCID 239Beta-AlanineHCID 10942334Sodium MethoxideHCID 682973641,3-Dibenzyl-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

Product 1

HCID 682974763-[(1,3-Dibenzyl-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carbonyl)-amino]-propionic acidYield 54.6%

Reagents, catalysts & solvents 1

HCID 516892Sodium BicarbonateSolvent

Procedure

A mixture of 1,3-dibenzyl-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (35 mg, 0.088 mmol), β-alanine (624 mg, 7.0 mmol) and NaOMe solution (10.5 mL, 5.3 mmol, 0.5 M in MeOH) was refluxed for 16 h. After the mixture was cooled to r.t., the solvent was evaporated in vacuo. The residue was partitioned between EtOAc and water. 1 M HCl was added until pH was about 3. The aqueous layer was extracted with additional EtOAc, and the organic layers were combined, dried over MgSO4 and concentrated. The residue was purified by silica gel chromatography (5-50% EtOAc/hexanes+1% AcOH). The product isolated was dissolved in saturated NaHCO3 and washed several times with ether. The aqueous layer was acidified to pH about 3, and the resulting precipitate was isolated by filtration to give 22 mg of the title compound as a light yellow solid. MS: (+) m/z 458.36 (M+1).

Workup

  1. temperaturewas refluxed for 16 h
  2. customthe solvent was evaporated in vacuo
  3. customThe residue was partitioned between EtOAc and water
  4. addition1 M HCl was added until pH was about 3
  5. extractionThe aqueous layer was extracted with additional EtOAc
  6. dry with materialdried over MgSO4
  7. concentrationconcentrated
  8. customThe residue was purified by silica gel chromatography (5-50% EtOAc/hexanes+1% AcOH)
  9. customThe product isolated
  10. washwashed several times with ether
  11. customthe resulting precipitate was isolated by filtration

Sources & evidence

ORD record
ord-01beb0843a334017a722b24daee64a2d
Source dataset
uspto-grants-2016_03
Patent number
US09271970B2

Reaction notes

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