The optically active tetracycle 2 with six correct chiral centres common to numerous quassinoids is constructed from (S)-carvone and 3-methyl-2,5-dihydrothiophene S,S-dioxide involving highly regioselective and stereocontrolled reactions.
T. K. M. Shing and Y. Tang, J. Chem. Soc., Chem. Commun., 1992, 341 DOI: 10.1039/C39920000341
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