Tetracyclic quassinoid skeletons 2 and 22 with six correct chiral centres common to numerous quassinoids are constructed from (S)-carvone and 3-methylsulfolene by a 16-step and 13-step reaction sequence involving highly regioselective and stereocontrolled reactions.
T. K. M. Shing and Y. Tang, J. Chem. Soc., Perkin Trans. 1, 1994, 1625 DOI: 10.1039/P19940001625
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