Beta-Alanine → 3-[(6-Benzyl-4-hydroxy-5-oxo-5,6-dihydro-[2,6]naphthyridine-3-carbonyl)-amino]-propionic acid

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Reaction Steps

A mixture of 6-benzyl-4-hydroxy-5-oxo-5,6-dihydro-[2,6]naphthyridine-3-carboxylic acid methyl ester (25 mg, 0.081 mmol), β-alanine (956 mg, 10.7 mmol) and NaOMe solution (16 mL, 8.06 mmol, 0.5 M in MeOH) was refluxed for 16 h. Solvent was evaporated in vacuo, and the residue was partitioned between water and EtOAc. 1 M HCl was added with vigorous stirring until pH was about 2. The organic layer was dried over MgSO4 and concentrated. The crude solid was dissolved in saturated NaHCO3 and washed with ether. The aqueous layer was acidified to pH about 2 with 4 M HCl, and then extracted with EtOAc. The organic layer was dried over MgSO4 and concentrated to give 20 mg of the title compound. MS: (+) m/z 368.00 (M+1).

Provenance & Evidence