In the investigation of minor sesquiterpenoids in Rosa rugosa leaves, 11 novel sesquiterpenes, eight carotane aldehydes, two carotane acids and an acoranoid, were isolated and their structures elucidated by means of chemical and spectroscopic methods. The present study showed that R. rugosa is a major source of C-14-oxygenated carotanoids. Factors associated with stereoselective oxygen-introduction in epoxidation and/or peroxidation of the carotane skeleton is also discussed.
A Unified Approach to the Daucane and Sphenolobane Bicyclo[5.3.0]decane Core: Enantioselective Total Syntheses of Daucene, Daucenal, Epoxydaucenal B, and 14-<i>para</i>-Anisoyloxydauc-4,8-diene
作者:Nathan B. Bennett、Brian M. Stoltz
DOI:10.1002/chem.201302353
日期:2013.12.23
enone intermediate enables the enantioselective total syntheses of daucene, daucenal, epoxydaucenal B, and 14‐para‐anisoyloxydauc‐4,8‐diene. Central aspects include a catalytic asymmetric alkylation followed by a ringcontraction and ring‐closing metathesis to generate the five‐ and seven‐membered rings, respectively.