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The reaction of anthranilic acid with ethyl acetoacetate gives rise directly to 4-methylpyrano[3,2-c]quinoline2,5-dione. The mechanism is assumed to involve condensation of the initial product with a second molecule of the β-ketoester. None of the expected compound (2-methyl-4-oxo-1,4-dihydroquinoline-3-carboxylic acid) is formed in the reaction.

The Niementowski reaction of anthranilic acid with ethyl acetoacetate revisited: a new access to pyrano[3,2-c]quinoline-2,5-dione