Beta-Alanine → 3-[(1-Benzyl-5-hydroxy-2-oxo-3-phenyl-8-pyridazin-4-yl-1,2-dihydro-[1,7]naphthyridine-6-carbonyl)-amino]-propionic acid

HRID 920033Notes

Reaction equation

HRID 920033 reaction equation
CO[C:3]([C:5]1[C:6]([OH:35])=[C:7]2[C:12](=[C:13]([C:15]3[CH:20]=[CH:19][N:18]=[N:17][CH:16]=3)[N:14]=1)[N:11]([CH2:21][C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)[C:10](=[O:28])[C:9]([C:29]1[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=1)=[CH:8]2)=[O:4].[NH2:36][CH2:37][CH2:38][C:39]([OH:41])=[O:40].C[O-].[Na+]>C([O-])(O)=O.[Na+]>[CH2:21]([N:11]1[C:12]2[C:7](=[C:6]([OH:35])[C:5]([C:3]([NH:36][CH2:37][CH2:38][C:39]([OH:41])=[O:40])=[O:4])=[N:14][C:13]=2[C:15]2[CH:20]=[CH:19][N:18]=[N:17][CH:16]=2)[CH:8]=[C:9]([C:29]2[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=2)[C:10]1=[O:28])[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1

Participants

5

Reactant 3

HCID 239Beta-AlanineHCID 10942334Sodium MethoxideHCID 136377247HCID 136377247, compound

Product 1

HCID 1359812643-[(1-Benzyl-5-hydroxy-2-oxo-3-phenyl-8-pyridazin-4-yl-1,2-dihydro-[1,7]naphthyridine-6-carbonyl)-amino]-propionic acidYield 44.2%

Reagents, catalysts & solvents 1

HCID 516892Sodium BicarbonateSolvent

Procedure

A mixture of 1-benzyl-5-hydroxy-2-oxo-3-phenyl-8-pyridazin-4-yl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (30 mg, 0.065 mmol), β-alanine (576 mg, 6.5 mmol) and NaOMe solution (10 mL, 5.2 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 with vigorous stirring until pH was about 3-4. The aqueous layer was extracted with additional EtOAc, and the organic layers were combined, dried over MgSO4 and concentrated. The crude product was purified by silica gel chromatography (15-100% 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 3-4 with 6 M HCl, and the resulting precipitate was isolated by filtration to give 15 mg of the title compound. MS: (+) m/z 522.35 (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
  5. extractionThe aqueous layer was extracted with additional EtOAc
  6. dry with materialdried over MgSO4
  7. concentrationconcentrated
  8. customThe crude product was purified by silica gel chromatography (15-100% 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-e8686e9117ac462a99e1e6bd92973756
Source dataset
uspto-grants-2016_03
Patent number
US09271970B2

Reaction notes

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