| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5225053 | Tetrahedron | 2007 | 11 Pages |
Abstract
Natural enantiomers of unique tricyclic sesquiterpenoids, valeriananoids A–C 1–3, have been synthesized starting from bicyclo[2.2.2]octane-2,5-dione derivative 11, which was obtained by diastereoselective catalytic domino Michael reaction of oxophorone 5 with 8-phenylmenthyl acrylate 10 by LDA or silica-gel-base (NMAP-Li). The tricyclic ring was closed selectively by intramolecular 6-endo-trig mode cyclization of the ketyl radical, which was generated from keto-allylether 25 by either lithium or sodium naphthalenide.
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