反应详情

A mixture of 4-hydroxy-8-oxo-7,8-dihydro-[2,7]naphthyridine-3-carboxylic acid methyl ester (17 mg, 0.077 mmol), β-alanine (138 mg, 1.55 mmol) and NaOMe solution (2.3 mL, 1.16 mmol, 0.5 M in MeOH) was refluxed for 16 h. Solvent was evaporated in vacuo, and the residue was dissolved in saturated NaHCO3 and washed several times with ether. The aqueous layer was acidified with 4 M HCl to pH about 1, and the resulting mixture was extracted with EtOAc. The organic layer was dried over MgSO4 and concentrated to give 19 mg of the title compound as an off-white solid. MS: (+) m/z 278.21 (M+1).

1. temperaturewas refluxed for 16 h
2. customSolvent was evaporated in vacuo
3. dissolutionthe residue was dissolved in saturated NaHCO3
4. washwashed several times with ether
5. extractionthe resulting mixture was extracted with EtOAc
6. dry with materialThe organic layer was dried over MgSO4
7. concentrationconcentrated