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|Nocapyrones A-D, gamma-pyrones from a Nocardiopsis strain isolated from the marine sponge Halichondria panicea|
|Schneemann, I.; Ohlendorf, B.; Zinecker, H.; Nagel, K.; Wiese, J.; Imhoff, J.F. (2010). Nocapyrones A-D, gamma-pyrones from a Nocardiopsis strain isolated from the marine sponge Halichondria panicea. J. Nat. Prod. 73(8): 1444-1447. hdl.handle.net/10.1021/np100312f|
|In: Journal of Natural Products. American Chemical Society/American Society of Pharmacognosy: Washington. ISSN 0163-3864, more|
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Four new ?-pyrones, nocapyrones A-D (1-4), were isolated from an organic extract of the Nocardiopsis strain HB383, which was isolated from the marine sponge Halichondria panicea. These are the first ?-pyrones reported from a Nocardiopsis strain. The structures were elucidated on the basis of one- and two-dimensional NMR experiments and supported by HPLC-UV/MS and HRESIMS analyses. The biosynthesis of nocapyrone A was investigated by feeding experiments with 13C-labeled compounds. In addition, one diketopiperazine, which was only known as a synthetic compound before, was isolated. The bioactivies of 1, 2, and the diketopiperazine were evaluated in a panel of assays.