Boron trifluoride catalysed cyclization of the germacrolide-4-epoxide dihydroparthenolide (1) provided two known guaianolides and the xanthanolide (4), the latter transformation representing the first biomimetic conversion of a germacrolide into a xanthanolide.
F. J. Parodi and N. H. Fischer, J. Chem. Soc., Chem. Commun., 1986, 1405 DOI: 10.1039/C39860001405
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