Readily available trans-2,3-dibenzylbutyrolactones are converted in high yields via 4-hydroxycyclohexa-2,6-dienones into dibenzocyclooctene lignans by treatment with phenyliodonium diacetate in aqueous methanol followed by trifluoroacetic acid.
A. Pelter, P. Satchwell, R. S. Ward and K. Blake, J. Chem. Soc., Perkin Trans. 1, 1995, 2201 DOI: 10.1039/P19950002201
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