The dihydroxyspiroanthracenones 7–10 have been prepared from the spironaphthalenetrione 2 and treated with DDQ to afford the corresponding angular quinones 12–15.
J. A. Valderrama, C. D. Pessoa-Mahana and R. Tapia, J. Chem. Soc., Perkin Trans. 1, 1994, 3521 DOI: 10.1039/P19940003521
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