Ammonium Chloride → 9-Chloro-5-methoxycarbonylmethyl-6,7-dihydro-1H, 5H-pyrido[1,2,3-de]quinoxaline-2,3-dione

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A mixture of 9-bromo-5-methoxycarbonylmethyl-6,7-dihydro-1H, 5H-pyrido[1,2,3-de]quinoxaline-2,3-dione (530 mg, 1.50 mmol) and cuprous chloride (1.0 g, 10.1 mmol) in dimethyl sulfoxide (5 mL) was heated at 160° C. for 4.5 h and poured into 1N aqueous ammonium chloride (200 mL). The mixture was extracted with a mixed solvent of THF and ethyl acetate (600 mL). The extract was washed with 1N aqueous ammonium chloride (200 mL×2) and brine (200 mL), dried over magnesium sulfate, and concentrated. The residue was recrystallized from ethanol to give 125 mg of the title compound (27%): mp 218°~220° C. (dec); 1H NMR (270 MHz, DMSO-d6) δ12.08 (bs, 1H), 7.08 (d, 1H, J=2 Hz), 7.02 (d, 1H, J=2 Hz), 5.04~5.13 (m, 1H), 3.62 (s, 3H), 2.94 (ddd, 1H, J=17.1, 13.5, 4.5 Hz), 2.78 (dm, 1H, J=17.1 Hz), 2.63 (dd, 1H, J=18, 7.2 Hz), 2.57 (dd, 1H, J=18, 3.6 Hz), 2.09 (dm, 1H, J=13.5 Hz), 1.80~1.95 (m, 1H).

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