Acetic Acid → HCID 178476384, compound

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An orange suspension of 7-chloro-4-hydroxy-2-(2-hydroxyethyl)-1,2,5,10-tetrahydropyridazino[4,5-b]quinoline-1,10-dione (0.250 g, 0.81 mM) in a 30% solution of hydrobromic acid in glacial acetic acid (5 mL) was gently refluxed for 16 hours under nitrogen. The mixture was cooled to room temperature and diluted with water (20 mL) to form a precipitate. The collected solids were washed with water and methanol and then dried to give the title compound (0.242 g, 86%) as a tan solid, mp 307-309° C.; MS(CI): 350 (M+H).

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