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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 E(2) (PGE(2)) 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.

Nocapyrones H–J, 3,6-Disubstituted α-Pyrones from the Marine Actinomycete <i>Nocardiopsis</i> sp. KMF-001