A new short synthesis of 5,6-dimethylxanthenone-4-acetic acid (ASA404, DMXAA)
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A new short synthesis of 5,6-dimethylxanthenone-4-acetic acid (ASA404) is developed. The key steps of the synthesis are dibromination of 3,4-dimethylbenzoic acid, followed by regioselective coupling with 2-hydroxyphenylacetic acid and subsequent cyclodehydration.

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