| 论文题目: | A Thiopyranchromenone and Other Chromone Derivatives from an Endolichenic Fungus, Preussia africana |
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| 作者: | Zhang, F; Li, L; Niu, SB; Si, YK; Guo, LD; Jiang, XJ; Che, YS |
| 联系作者: | Che, YS |
| 刊物名称: | JOURNAL OF NATURAL PRODUCTS |
| 期: | 2 |
| 卷: | 75 |
| 页: | 230-237 |
| 年份: | 2012 |
| 影响因子: | 3.128 |
| 论文下载: | |
| 摘要: | The first example of a naturally occurring thiopyranchromenone, preussochromone A (1), and five other new chromone derivatives, preussochromones B-F (2-6), were isolated from solid cultures of an endolichenic fungus, Preussia africana. The structures of 1-6 were established primarily by NMR experiments, and 2 and 4 were further confirmed by X-ray crystallography. The absolute configurations of 1 and 2 were determined by the application of electronic circular dichroism (ECD), whereas those of C-5 in 3, C-6 in 4, and the 6,7-diol in 5 were deduced via the CD data of the in situ formed [Rh-2(OCOCF3)(4)] complex, the modified Mosher method, and Snatzke's method, respectively. Compounds 1 and 3 showed significant cytotoxicity against A549 cells. |
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