2,2-Dimethyl-1,3-dioxane-4,6-dione → 6-methoxy-2-oxo-2H-chromene-3-carboxylic acid

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Reaction Conditions

Reaction Steps

5-methoxy-salicylaldehyde (211.1 mg, 1.39 mmol) and Meldrum's acid (200 mg, 1.39 mmol) were combined in H2O (2 mL). The solution was stirred at 75° C. for 2 h. After cooling to room temperature, the precipitate was filtered and dried at suction to give 241.1 mg of 6-methoxy-3-carboxy-coumarin in a 79% yield.

Provenance & Evidence