Addition of the lactone anion derived from 29 to 13 gave the adduct 30, which was dehydrated to give 20; subsequent conversion of 20 into the anthraquinone 26 was achieved in two steps.
P. Magnus, S. A. Eisenbeis and N. A. Magnus, J. Chem. Soc., Chem. Commun., 1994, 1545 DOI: 10.1039/C39940001545
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