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Briaexcavatins A and B, novel briaranes from the octocoral Briareum excavatum |
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| Authors: | Ping-Jyun Sung Chih-Hua Chao Jui-Hsin Su Jyh-Horng Sheu |
| Institution: | a National Museum of Marine Biology and Aquarium, Checheng, Pingtung 944, Taiwan, ROC b Institute of Marine Biotechnology, National Dong Hwa University, Checheng, Pingtung 944, Taiwan, ROC c Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan, ROC d Faculty of Biotechnology, Kaohsiung Medical University, Kaohsiung 807, Taiwan, ROC |
| Abstract: | Two novel briaranoidal derivatives, designated as briaexcavatins A (1) and B (2), along with two known metabolites, excavatolides B and C (3 and 4), were isolated from the octocoral Briareum excavatum. Both compounds 1 and 2 possess unprecedented 5,6-epoxy moiety in the 10-membered ring. Diterpenoid 1 possesses a novel pentacyclic skeleton with a ε-lactone. The structures of diterpenoids 1 and 2 were elucidated by interpretation of spectral data and the absolute stereochemistry was established by application of modified Mosher’s method on 3. |
| Keywords: | Briarane Briaexcavatin A Briaexcavatin B Briareum excavatum Octocoral |
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