Quinolinic Acid → Furo[3,4-b]pyridine-5,7-dione

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A mixture of pyridine-2,3-dicarboxylic acid (2 g, 12 mmol) and acetic anhydride was heated at 115° C. for 4 h. Excess reagent was removed under reduced pressure. The remaining solid was triturated with hot carbon tetrachloride. After cooling, the solid was collected by vacuum filtration and dried overnight under vacuum at 60° C. to give furo[3,4-b]pyridine-5,7-dione (1.55 g, 10.4 mmol). 1H NMR (400 MHz, DMSO-d6) δ 9.10 (dd, J=4.9, 1.5 Hz, 1H), 8.50 (dd, J=7.8, 1.5 Hz, 1H), 7.90 (dd, J=7.8, 4.9 Hz, 1H).

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