Total Synthesis of the Pentacyclic Diterpenoid Tropone Hainanolidol
The total synthesis of the unusual diterpenoid tropone, hainanolidol (1), discovered in the bark of the yew species, Cephalotaxus hainanensis, has been completed in 26 steps from 3,5-dimethylanisole. The intramolecular cyclopropanation reaction of the aryl ring in (30) by means of the rhodium mandelate-catalysed reaction of the diazoacetyl function was used to assemble the 5/7 ring system of (31), at the same time elaborating a cycloheptatriene moiety that could be transformed subsequently to...[Show more]
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|Source:||Australian Journal of Chemistry|
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