Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 74, Issue 10, Pages 3806-3814Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo9001992
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Funding
- Natural Sciences and Engineering Council of Canada
- Merck-Frosst Canada Ltd.,
- Universite de Sherbrooke
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We describe the syntheses of (+)-euphococcinine and (-)-adaline, two naturally occurring alkaloids containing a quaternary carbon bearing a nitrogen atom. Key features of the syntheses are a 3,3-sigmatropic rearrangement to give an all-carbon quaternary center, a ring-closing alkene metathesis to give an 8-membered ring, and the use of a single enantiomer of p-menthane-3-carboxaldehyde to make two natural alkaloids of opposite configuration.
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