No abstract

Five new oxygenated pimarane diterpenes, named scopararanes C–G (1–5) were isolated from the culture of a marine sediment-derived fungus Eutypella scoparia FS26 obtained from the South China Sea. The structures of these compounds were established on the basis of extensive spectroscopic analysis. The absolute configurations of compounds 1–5, were determined by CD spectroscopic analysis and comparison with literature data. All isolated compounds (1–5) were evaluated for their cytotoxic activities against MCF-7, NCI-H460, and SF-268 tumor cell lines by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) method.

Two new polyketides, 7,8-dihydroxy-3,5,7-trimethyl-8,8a-dihydro-1H-isochromen-6(7H)-one (1) and 6-(hydroxymethyl)-2,2-dimethyl-3,4-dihydro-2H-chromene-3,4-diol (2), together with a known nitrogen-containing polyketide (cytochalasin-type of metabolites), [12]-cytochalasin (3), have been isolated from the fermentation broth of a marine sediment-derived fungus Eutypella scoparia FS26 obtained from the South China Sea. Their structures were elucidated by spectroscopic methods, mainly 1D and 2D NMR spectroscopic techniques. The absolute configurations of compound 1 were determined by NOESY analysis and the literature data were compared with circular dichroism (CD) spectroscopy. The cytotoxic effects on MCF-7, NCI-H460 and SF-268 cell lines of all compounds were evaluated by the sulforhodamine B method.

A new monocyclofarnesane-type sesquiterpene, 3,7,10-trihydroxy-6,11-cyclofarnes-1-ene (1), and a new acorane-type sesquiterpene, 8-(hydroxymethyl)-1-(2-hydroxy-1-methylethyl)-4-methylspiro[4.5]-dec-8-en-7-ol (2), were isolated from the culture of Eutypella scoparia FS26 from the South China Sea, along with three known terpenes, 3 -5. The structures of these compounds were determined by extensive analysis of their spectroscopic data as well as by comparison with literature reports. The isolated compounds 1 -5 were evaluated for their cytotoxic activities against the SF-268, MCF-7, and NCI-H460 tumor cell lines.