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Nine new eunicellin-based diterpenoids, simplexins A-I (1-9), were isolated from a Dongsha Atoll soft coral, Klyxum simplex. The structures of these compounds were established by detailed spectroscopic analysis (IR, MS, 1D and 2D NMR) and by comparison with the physical and spectral data of related known compounds. The absolute configuration of 1 was… (More)
Four new eunicellin-based diterpenes, simplexins P-S (1-4), and the known compound simplexin A (5), have been isolated from the soft coral Klyxum simplex. The structures of the new metabolites were determined on the basis of extensive spectroscopic analysis, particularly 1D and 2D NMR experiments. Compounds 1 and 3-5 were shown to exhibit cytotoxicity… (More)
In this study, we examined the antitumor effect of marine algae extracts on human hepatoma and leukemia cells. Ethyl acetate extracts from Colpomenia sinuosa (Cs-EA), Halimeda discoidae (Hd-EA), and Galaxaura oblongata (Go-EA) directly inhibited the growth of human hepatoma HuH-7 cells and leukemia U937 and HL-60 cells in a time- and dose-dependent manner.… (More)
Four new briarane-type diterpenoids, briaexcavatolides S-V (1-4), have been isolated from a Formosan gorgonian Briareum excavatum. The structures, including the relative stereochemistry of these new metabolites, were established by extensive 1D and 2D NMR spectroscopic methods and by comparison of the related spectral data with those of known analogues.
A new trihydroxyl briarane-type diterpenoid, junceellolide H (1), along with two known compounds, praelolide (2) and junceellin (3), have been isolated from the gorgonian coral Junceella fragilis. The structure, including the relative configuration of the new diterpenoid 1, was elucidated by extensive spectroscopic methods.
Six new polyoxygenated steroids, hippuristerones J-L (1-3), hippuristerols E-F (4, 5), and a novel gorgosteroid, 1alpha,3beta,5beta,11alpha-tetrahydroxygorgostan-6-one (6), were isolated from the gorgonian Isis hippuris. The structures of these metabolites were elucidated by extensive spectroscopic analyses and comparison of the NMR data with those of… (More)
Glaucumolides A (1) and B (2), novel biscembranes composed of an unprecedented α,β-unsaturated ε-lactone, along with the known metabolites ximaolide A (3) and isosarcophytonolide D (4), were isolated from the cultured soft coral Sarcophyton glaucum. The structures of the new metabolites were determined by extensive spectroscopic analyses. Compounds 1 and 2… (More)
We found some errors in our previous published paper . The structure of simplexin Q was found to be the same as klysimplexin C, previously published in have the same structure (see Figure 1). We apologize for any inconvenience caused to the readers by these errors.
Parvistones A-E (1-5), five new styryllactones possessing a rare α,β-lactone moiety and a 6S configuration, were isolated from a methanolic extract of Polyalthia parviflora leaves. The structures and the absolute configuration of the isolates were elucidated using NMR spectroscopy, specific rotation, circular dichroism, and X-ray single-crystal analysis.… (More)