2-Amino-5-chlorobenzoic acid → 8-Chloro-10-oxo-10H-pyridazino[6,1-b]quinazoline-2-carboxylic acid

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Reaction Steps

A mixture of 5-chloroanthranilic acid (5.4 g, 31.6 mmol) and 6-chloropyridazine-3-carboxylic acid (5.0 g, 31.6 mmol) is heated at reflux in acetic acid (50 ml) for 80 hrs. The mixture is cooled and the precipitate which formes is collected to give 4.73 g of crude product, m.p. 253°-300° C. (dec.). Recrystallization of this material from pyridine gives the analytical material, m.p. 260°-262° C.

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