Two new meroterpenoids, aspermeroterpenes D and E ( and ), two new ophiobolin-type sesterterpenoids, the C-18 epimers of 18,19-dihydro-18-methoxy-19-hydroxyophiobolin P ( and ), and two new drimane-type sesquiterpenoids, 3-hydroxystrobilactone A () and 6--strobilactone A (), along with 11 known terpenoids (- and -) were isolated from the cultures of the algicolous fungus sp. RR-YLW-12, derived from the red alga . The structures and relative configurations of new compounds were established by detailed spectroscopic analysis of NMR and HRMS experiments, and the absolute configurations were assigned by X-ray diffraction experiments and comparison of their experimental and calculated ECD spectra. Compound features a rare 6/6/6/6/5 pentacyclic system with a meroterpenoid skeleton, and the structure of terretonin E () was revised in this study. Compound showed significant inhibitory activities against three microalgae, , , and , with IC values of 10.5, 5.2, and 3.1 μg/mL, respectively.
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http://dx.doi.org/10.1021/acs.jnatprod.1c00021 | DOI Listing |
Fitoterapia
October 2023
Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, People's Republic of China. Electronic address:
J Nat Prod
June 2021
Yantai Institute of Coastal Zone Research, Center for Ocean Mega-Science, Chinese Academy of Sciences, Yantai 264003, People's Republic of China.
Two new meroterpenoids, aspermeroterpenes D and E ( and ), two new ophiobolin-type sesterterpenoids, the C-18 epimers of 18,19-dihydro-18-methoxy-19-hydroxyophiobolin P ( and ), and two new drimane-type sesquiterpenoids, 3-hydroxystrobilactone A () and 6--strobilactone A (), along with 11 known terpenoids (- and -) were isolated from the cultures of the algicolous fungus sp. RR-YLW-12, derived from the red alga . The structures and relative configurations of new compounds were established by detailed spectroscopic analysis of NMR and HRMS experiments, and the absolute configurations were assigned by X-ray diffraction experiments and comparison of their experimental and calculated ECD spectra.
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