Russian Chemical Bulletin

, Volume 63, Issue 2, pp 529–537 | Cite as

New strategy for the synthesis of ladybird beetle azaphenalene alkaloids using a combination of allylboration and intramolecular metathesis. Total synthesis of (±)-Hippocasine and (±)-epi-Hippodamine

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A new strategy for assembly a tricyclic skeleton of ladybirds azaphenalene alkaloids (coccinellides) was developed based on the combination of allylboration reaction and intramolecular metathesis. The first key step is the 1,2-organolithiation of 4-picoline with (4,4-dieth-oxybutyl)lithium with subsequent reductive allylation with triallylborane leading to trans-2-allyl-6-(4,4-diethoxybutyl)-4-methyl-1,2,3,6-tetrahydropyridine. The 4,4-diethoxybutyl substituent was further converted to 4-acetoxy-5-hexenyl in four steps, then, the product obtained was involved in the second key step, the intramolecular allylic amination upon treatment with a [Pd] or an [Ir] catalyst giving diastereomeric bicyclic terminal dienes (∼1: 1), which were separated by chromatography. The stereochemistry of one of the dienes is the same as that in alkaloid Hippocasine. The third key step (the intramolecular metathesis reaction) includes the final assembly of the azaphenalene system. The tricyclic derivative obtained contains two differently substituted C=C bonds, selective hydrogenation of one of which (Pd/C) leads to (±)-Hippocasine, whereas exhaustive hydrogenation gives (±)-epi-Hippodamine.

Key words

Hippocasine epi-Hippodamine allylboranes allylboration nitrogen heterocycles cyclization metathesis 


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.N. D. Zelinsky Institute of Organic ChemistryRussian Academy of SciencesMoscowRussian Federation
  2. 2.A. N. Nesmeyanov Institute of Organoelement CompoundsRussian Academy of SciencesMoscowRussian Federation

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