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zhenyuhao金蟲 (小有名氣)
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[求助]
急,跪求英語單詞解釋
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Cytospolides, Nonanolides, |
金蟲 (正式寫手)
金蟲 (正式寫手)
金蟲 (小有名氣)
金蟲 (正式寫手)
木蟲 (正式寫手)

鐵桿木蟲 (著名寫手)
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這應(yīng)該是原文,請郵寄合成的高手一試。 Cytospolides A–E (1–5), five new nonanolides with an unprecedented 15-carbon skeleton with the unique chemical feature of a C-2 methyl group, were isolated from the endophytic fungus Cytospora sp. The structures were elucidated by spectroscopic analysis, chemical interconversion, and single-crystal XRD. The solution and solid state conformers were compared by experimental methods (X-ray, NMR) and solvent and gas phase DFT calculations. The absolute configurations were assigned by time dependent (TD)-DFT calculations of CD spectra, including solution and solid state CD/TD-DFT approaches. The cytotoxicity assay of C-2 epimers showed significantly different activity against A549, suggesting that the C-2 methyl group has an important role in growth inhibition towards the tumor line. The existence of two conformers of the bioactive epimer in solution was proven by the soft pulse transfer NMR technique and further supported by DFT calculations. The discovery of the new metabolites not only extends the nonanolide family with cytospolide-type skeletons but also gives insight into the biosynthetic process of these fungal metabolites. |
版主 (文壇精英)
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1、Cytospolides,從下文的文字,可翻為 內(nèi)生真菌十元環(huán)內(nèi)酯 植物內(nèi)生真菌Cytospora sp. 發(fā)酵物中提取分離得到的16 種具有抗 腫瘤和抗菌活性的十元環(huán)內(nèi)酯類新化合物,分別命名為Cytospolides A ~ CytospolidesP, 化合物編號依次為1 ~ 16,它們的化學結(jié)構(gòu)通式如下: [0004] [0005] 其中,R1 基團為CH3 R2 基團為OH 或= O 或OAc [0006] R3 基團為OH 或H 或雙鍵 R4 基團為OAc 或-O- 或雙鍵 [0007] R5 基團為OH 或H 或OAc 或-O- R6 基團為OH 或H 或OAc [0008] R7 基團為H 或OAc |

版主 (文壇精英)

銅蟲 (正式寫手)
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