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

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A mixture of 1-benzyl-8-hydroxy-2-oxo-1,2-dihydro-[1,6]naphthyridine-7-carboxylic acid methyl ester (19 mg, 0.061 mmol), β-alanine (726 mg, 8.15 mmol) and NaOMe solution (12.3 mL, 6.113 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 to pH about 1 with 4 M HCl, and the resulting precipitate was collected by filtration and dried to give 12 mg of the title compound as a pale pink solid. MS: (+) m/z 368.33 (M+1).

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