A dihydroisobenzofuran (13) was obtained from β-ionone in 10 steps via an intramolecular Diels–Alder reaction. On further oxidation, reductive ring opening and decarboxylation, cuparene and herbertene were synthesized.
T. Ho and M. Chang, J. Chem. Soc., Perkin Trans. 1, 1999, 2479 DOI: 10.1039/A904068D
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