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

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A mixture of 5-hydroxy-2-oxo-1,3-diphenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (30 mg, 0.081 mmol), β-alanine (431 mg, 4.84 mmol) and NaOMe solution (8 mL, 4.03 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 dissolved in water and washed several times with ether. The aqueous layer was acidified to pH 2 with 4 M HCl, and the resulting precipitate was isolated by filtration to give 30 mg of the title compound as a light yellow solid. MS: (+) m/z 430.27 (M+1).

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