Hydrochloric Acid → 1-Benzyl-3-bromo-5-hydroxy-2-oxo-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester

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1-Benzyl-5-bromo-2-{[methoxycarbonylmethyl-(toluene-4-sulfonyl)-amino]-methyl}-6-oxo-1,6-dihydro-pyridine-3-carboxylic acid methyl ester (169 mg, 0.29 mmol) was dissolved in 2 mL of MeOH. NaOMe solution (0.2 mL, 0.88 mmol, 25 wt % in MeOH) was added and the mixture was stirred for 5 h. Saturated NH4Cl (10 mL) was added, followed by addition of 1M HCl until pH about 2. The resulting mixture was extracted several times with EtOAc. The organic layers were combined, dried over MgSO4, and concentrated in vacuo. The crude product was purified by silica gel chromatography (0-60% EtOAc/hexanes+2% AcOH) to give 50 mg of the title compound as a yellow solid. MS: (+) m/z 388.95, 390.92 (M+1, 79/81Br).

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