The sesquiterpene (–)-warburganal was prepared from a (1S)-1-methoxycarbonyl-2,5,5,8a-tetramethyl-decahydronaphthalene (4) obtained by degradation of commercial glycyrrhetinic acid.
S. Manna, P. Yadagiri and J. R. Falck, J. Chem. Soc., Chem. Commun., 1987, 1324 DOI: 10.1039/C39870001324
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