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

Reaction equation

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

Participants

Reactant 3

HCID 239Beta-Alanine

HCID 10942334Sodium Methoxide

HCID 1363772421-Benzyl-5-hydroxy-2-oxo-3-phenyl-8-pyrazin-2-yl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

Product 1

HCID 1359812443-[(1-Benzyl-5-hydroxy-2-oxo-3-phenyl-8-pyrazin-2-yl-1,2-dihydro-[1,7]naphthyridine-6-carbonyl)-amino]-propionic acidYield 73.6%

Procedure

A mixture of 1-benzyl-5-hydroxy-2-oxo-3-phenyl-8-pyrazin-2-yl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (40 mg, 0.086 mmol), β-alanine (768 mg, 8.62 mmol) and NaOMe solution (13 mL, 6.47 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 4. The aqueous layer was extracted with additional EtOAc, and the organic layers were combined, dried over MgSO4 and concentrated. The residue was dissolved in saturated NaHCO3 and washed several times with ether. The aqueous layer was acidified to pH about 4, and the resulting precipitate was isolated by filtration to give 33 mg of the title compound as a light yellow solid. MS: (+) m/z 522.29 (M+1).