A Convergent Enantioselective Total Synthesis of (-)-Perhydrohistrionicotoxin with an Intramolecular Imino Ene-type Reaction as a Key Step.

David Ackland Tanner, Lars Hagberg

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    A convergent enantioselective total synthesis of the neurotoxic spirocyclic alkaloid (-)-perhydrohistrionicotoxin (2) is described. A Lewis acid-mediated intramolecular imine ene-type reaction was used for the key spirocyclisation step (14 to 3, with 3 being obtained as a single diastereoisomer). Spirocyclisation precursor 14 was prepared from enantiomerically pure ketone 13, itself available via an efficient one-pot, three-component, coupling reaction involving chiral electrophiles 9 and 10. The stereogenic centres of 9 and 10 derive in turn from Sharpless kinetic resolution, which allowed access to both chiral electrophiles from a common racemic precursor, 8. (C) 1998 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    Issue number27
    Pages (from-to)7907-7918
    Publication statusPublished - 1998

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