Spiro-compounds [e.g., (8), (13)] that resemble the four central rings of the antitumour agent fredericamycin A have been synthesized by methods that are based on (i) intramolecular acylation and high-pressure Diels–Alder chemistry [(5)→(8)] or (ii) radical spiro-cyclization [e.g., (11)→(13)].
S. M. Bennett and D. L. J. Clive, J. Chem. Soc., Chem. Commun., 1986, 878 DOI: 10.1039/C39860000878
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