Cycloaddition of Cyclohexa-2,4-dienones, Ring-Closing Metathesis, and Photochemical Reactions: A Common Stereoselective Approach to Duprezianane, Polyquinane and Sterpurane Frameworks
The Journal of Organic Chemistry2007Vol. 72(6), pp. 2058–2067
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Abstract
A novel approach to three different types of carbocyclic frameworks belonging to dupreziananes, sterpuranes, and polyquinanes from simple aromatic precursors has been presented. Cycloaddition of appropriately appended cyclohexa-2,4-dienones with acyclic dienes gave bridged bicyclic octanes suitably disposed with olefinic chains, which upon ring-closing metathesis led to functionalized tricyclo[5.2.2.0(1,5)]undecanes related to dupreziananes. Photochemical sigmatropic 1,2- and 1,3-acyl shifts in tricyclo[5.2.2.0(1,5)] undecanes upon triplet and singlet excitation provided stereoselective routes to sterpurane and polyquinane frameworks.
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