Novel, general routes to 2-methylpyrano[3,2-c][1]benzopyran-4,5-diones are reported. Di-O-methylcitromycinone, a major degradation product of the fungal metabolite, citromycetin, has been synthesised.
S. A. Ali, J. W. Powell and W. B. Whalley, J. Chem. Soc., Perkin Trans. 1, 1973, 173 DOI: 10.1039/P19730000173
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