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1,8-Dihydroxy-4-methylanthraquinone was recently isolated as a red liquid from cyanobacterium. We have confirmed that assignment by synthesizing unambiguously the titled compound in a two-step process. This synthetic methodology consisted of treating 4-methoxy-3cyanophthalide with 2-bromo-4-methylanisole under aryne-forming conditions then demethylating the1,8-dimethoxy-4-methylanthra-quinone so formed.

Unambiguous synthesis and spectral characterization of 1,8-dihydroxy-4-methylanthraquinone