Methanol → (5S)-9-Bromo-5-[p-tert-butoxycarbonylaminomethyl-o-(1-carboxy-1-hydroxymethyl) phenylcarbamoylmethyl]-6,7-dihydro-1H, 5H-pyrido[1,2,3-de]quinoxaline-2,3-dione

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A solution of (5S)-9-bromo-5-[p-tert-butoxycarbonylaminomethyl-o-(1-methoxycarbonyl-1-acetoxymethyl)phenylcarbamoylmethyl]-6,7-dihydro-1H, 5H-pyrido[1,2,3-de]quinoxaline-2,3-dione (310 mg, 0.46 mmol) in a mixture of 1N aqueous sodium hydroxide (6 mL), THF (5 mL), and methanol (5 mL) was stirred for 6 h at room temperature. The mixture was concentrated to ca. 6 mL and acidified with 5% aqueous potassium hydrogen sulfate. The precipitates formed were collected and dried to give 276 mg of the title compound (97%).

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