4-Methoxy-7-methylnaphthalene-1,5-diol, prepared via a new selective acetylation procedure, is oxidised by lead(IV) oxide to diosindigo B (Ia) which on further oxidation with nitric acid affords biramentaceone (IIa); related reactions produce mamegakinone (IIb) and rotundiquinone (IIc).
B. C. Maiti, O. C. Musgrave and D. Skoyles, J. Chem. Soc., Chem. Commun., 1976, 244 DOI: 10.1039/C39760000244
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