The cyclopentanoid C9-terpene lactones, onikulactone (7) and mitsugashiwalactone (8) have been synthesized by a novel intramolecular cyclization of a carbonate ester of cyclopentadienylethanol (2), followed by methylation and hydrogenation.
T. Fujisawa, T. Kobori and H. Ohta, J. Chem. Soc., Chem. Commun., 1976, 186 DOI: 10.1039/C39760000186
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