Diethyl Oxalate → 8-(4-Amino-3-fluorophenoxy)pyrido[3,2-b]pyrazine-2,3(1H,4H)-dione

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A solution of tert-butyl 4-(2,3-diaminopyridin-4-yloxy)-2-fluorophenylcarbamate (1.03 g, 3.08 mmol) was dissolved in dry EtOH (10 mL), diethyl oxalate (10 mL) was added and the solution was heated to reflux for 96 h, cooled to RT and filtered. The title compound was isolated as a white solid. Yield: 820 mg (92%).

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