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001-es BibID:	BIBFORM008910
Első szerző:	Krohn, Karsten
Cím:	Xanthones and Oxepino[2,3-b]chromones from Three Endophytic Fungi / Karsten Krohn, Simeon F. Kouam, Guy M. Kuigoua, Hidayat Hussain, Stephan Cludius-Brandt, Ulrich Flörke, Tibor Kurtán, Gennaro Pescitelli, Lorenzo Di Bari, Siegfried Draeger, Barbara Schulz
Dátum:	2009
Megjegyzések:	Three new metabolites, microsphaeropsones A-C (1-3) with a unique oxepino[2,3-b]chromen-6-one (ring-enlarged xanthone) skeleton, were isolated from the endophytic fungus Microsphaeropsis species, co-occurring with their putative biogenetic anthraquinoide precursors citreorosein (4) and emodin (5). From another Microsphaeropsis species, large amounts of fusidienol A (8a), smaller amounts of emodin (5), the known aromatic xanthones 9a and 9b, the new 3,4-dihydrofusidienol A (8b), and the new aromatic xanthone 9 c were isolated. The endophyte Seimatosporium species produced a new aromatic xanthone, seimatoxanthone A (10), and 3,4-dihydroglobosuxanthone A (12), closely related to -diversolonic ester (13) from Microdiplodia sp.. The structures were determined mainly by extensive 1D and 2D NMR experiments and supported by X-ray single-crystal analysis of 1 and the oxidation product 7. The absolute configurations of the microsphaeropsones A-C (1-3) were established by comparison of the electronic and vibrational circular dichroism (ECD and VCD) spectra of 1 with time-dependent DFT (TDDFT) and DFT calculations by using either the solid-state structures or DFT-optimized geometries as inputs. Preliminary studies indicated that 1, 2, and enone 7 showed antibacterial, fungicidal, and algicidal properties.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban anthraquinones biological activity circular dichroism density functional calculations xanthones
Megjelenés:	Chemistry - A European Journal. - 15 : 44 (2009), p. 12121-12132. -
További szerzők:	Kouam, Simeon F. Kuigoua, Guy Merlin Hussain, Hidayat Cludius-Brandt, Stephan Flörke, Ulrich Kurtán Tibor (1973-) (vegyész, angol szakfordító) Pescitelli, Gennaro (1972-) (vegyész) Di Bari, Lorenzo Dräeger, Siegfried Schulz, Barbara
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