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Nocapyrones H–J, 3,6-Disubstituted α-Pyrones from the Marine Actinomycete Nocardiopsis sp. KMF-001
2013 Volume 61 Issue 5 Pages 511-515
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2013 Volume 61 Issue 5 Pages 511-515
Three new 3,6-disubstituted α-pyrones, nocapyrones H–J (1–3), were isolated from the marine actinomycete Nocardiopsis sp. KMF-001. Their structures were assigned to be 3-alkylated 6-(1-methyl-1-propenyl)-2H-pyran-2-ones on the basis of UV, MS, NMR, and high resolution (HR)-FAB-MS analyses. Nocapyrone H (1) reduced the pro-inflammatory factor such as nitric oxide (NO), prostaglandin E2 (PGE2) and interleukin-1β (IL-1β). Moreover, nocapyrone H showed 5.82% stronger inhibitory effect on NO production than chrysin at a concentration of 10 µm in lipopolysaccharide (LPS)-stimulated BV-2 microglial cells.
