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Synthesis of the proposed structure of plakevulin A: revised structure of plakevulin A |
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| Authors: | Fumiyo Saito Ryo Takeuchi Tomoyuki Kamino Kouji Kuramochi Kengo Sakaguchi Susumu Kobayashi Masashi Tsuda |
| Institution: | a Frontier Research Center for Genome and Drug Discovery, Tokyo University of Science (RIKADAI), 2641 Yamazaki, Noda, Chiba 278-8510, Japan b Faculty of Pharmaceutical Sciences, Tokyo University of Science (RIKADAI), 2641 Yamazaki, Noda, Chiba 278-8510, Japan c Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science (RIKADAI), 2641 Yamazaki, Noda, Chiba 278-8510, Japan d Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060-0812, Japan |
| Abstract: | A total synthesis of the proposed structure of plakevulin A was accomplished. However, the NMR spectral data of the synthetic plakevulin A were not identical of those of the reported compound. We next converted the synthetic plakevulin A into 1-dihydrountenone A. The 1H and 13C NMR spectral data of 1-dihydrountenone A were identical with those of reported plakevulin A except for the peaks derived from levulinic acid. Thus, we repurified sample of the natural product and confirmed that the natural sample contained 1-dihydrountenone A and levulinic acid in the ratio of one to one. We also found that not plakevulin A but 1-dihydountenone A possessed the inhibitory activity against mammalian DNA polymerases α and β. |
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