A spiro diketone 7 containing a pentamethoxynaphthalene unit, and representing four contiguous rings of the antitumour antibiotic fredericamycin A 1, was constructed by radical spirocyclization
D. L. J. Clive, A. Khodabocus, P. G. Vernon, A. G. Angoh, L. Bordeleau, D. S. Middleton, C. Lowe and D. Kellner, J. Chem. Soc., Perkin Trans. 1, 1991, 1433 DOI: 10.1039/P19910001433
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