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Three new naphthoquinone pigments isolated from the freshwater fungus, Astrosphaeriella papuana.
Le Wang
1 ,
Jin Yan Dong ,
Hong-Chuang Song ,
Kai Ze Shen ,
Li Mei Wang ,
Rong Sun ,
Chun Ren Wang ,
Yan Xiu Gao ,
Guo Hong Li ,
Lei Li ,
Ke Qin Zhang
Oct 2009
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Abstract
Three new naphthoquinones, astropaquinones A-C (1-3), were isolated from cultures of the freshwater fungus Astrosphaeriella papuana YMF 1.01181, together with the known compound, 6-hydroxy-2,4-dimethoxy-7-methylanthraquinone (4). The structures of the compounds were settled mainly by interpretation of their 1D and 2D NMR spectra. Astropaquinone B (2) and C (3) were found to possess a rare pyranonaphthoquinone skeleton containing a lactol ring. Furthermore, compounds 1-4 showed moderate antagonistic activity against nine fungi and four bacterial strains.