A polycyclic ring system consisting of fused sesquiterpene and phenolic units, whose structure was found by X-ray crystallography to coincide with that which forms the nucleus of a series of natural products, can be constructed from chromone and terpene precursors via sequential conjugate addition and manganese(III)-induced 6-endo-trig radical cyclisation reactions.
B. S. Crombie, A. D. Redhouse, C. Smith and T. W. Wallace, J. Chem. Soc., Chem. Commun., 1995, 403 DOI: 10.1039/C39950000403
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