Hydrochloric Acid → 10-(2-Carboxyethylamino)-7-chloro-2,3-dihydropyridazino[4,5-b]quinoline-1,4-dione

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A mixture of 10-(2-ethoxycarbonylethylamino)-7-chloro-2,3-dihydropyridazino[4,5-b]quinoline-1,4-dione (0.08 g, 0.22 mM) and 1N hydrochloric acid was refluxed for 1 hr and then cooled to room temperature and filtered. The collected orange solid was washed with water and air dried to provide (0.07 g, 97%) the title compound as an orange powder, mp 356°-359° C.; MS(CI): 335 (M+H).

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