Glycine → [(7-Benzyl-4-hydroxy-1-methyl-8-oxo-7,8-dihydro-[2,7]naphthyridine-3-carbonyl)-amino]-acetic acid

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Reaction Steps

A mixture of 7-benzyl-4-hydroxy-1-methyl-8-oxo-7,8-dihydro-[2,7]naphthyridine-3-carboxylic acid methyl ester (25 mg, 0.077 mmol), glycine (770 mg, 10.3 mmol) and NaOMe solution (15 mL, 7.7 mmol, 0.5 M in MeOH) was refluxed for 16 h. After the mixture was cooled to r.t., solvent was evaporated in vacuo. 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 was chromatographed (5-70% EtOAc/hexanes+2% AcOH) to give 21 mg of the title compound as a pale yellow solid. MS: (+) m/z 367.98 (M+1).

Provenance & Evidence