Glycine → [(1,3-Dibenzyl-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carbonyl)-amino]acetic acid

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Reaction Steps

A mixture of 1,3-dibenzyl-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (75 mg, 0.19 mmol), glycine (1.87 g, 24.9 mmol) and NaOMe solution (37.5 mL, 18.8 mmol, 0.5M 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 saturated NaHCO3 and washed with ether. The aqueous layer was acidified to pH 2 with 4M HCl, and the resulting mixture was extracted with EtOAc. The organic layer was dried over MgSO4 and concentrated. The crude product was further purified by silica gel chromatography (20-100% EtOAc/hexanes+2% AcOH) to give 32 mg of the title compound as an off-white solid. MS: (+) m/z 444.11 (M+1).

Provenance & Evidence