The spiroenone (7), stereoselectively prepared from (+)-p-menth-1-ene (3) in four steps, was converted by two different reaction sequences into the natural sesquiterpenes (–)-acorenone (1) and (–)-acorenone B (2), respectively, thus establishing the absolute configuration of (1).
M. Pesaro and J. Bachmann, J. Chem. Soc., Chem. Commun., 1978, 203 DOI: 10.1039/C39780000203
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