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Synthesis and Characterization of Novel Sulfonylurea Derivatives
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作者 ZHANGGuang-liang LIYao-xian ZHANGSuo-qin GAOFei-fei 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第4期439-443,共5页
On the basis of study on the mechanism of action of sulfonylurea herbicides, nine sulfonylurea derivatives of iso-{xazolidinone} were designed and synthesized. The structures of these compounds were confirmed by means... On the basis of study on the mechanism of action of sulfonylurea herbicides, nine sulfonylurea derivatives of iso-{xazolidinone} were designed and synthesized. The structures of these compounds were confirmed by means of IR, MS, NMR and elemental analysis. The results of preliminary active tests indicate that the compounds have some herbicidal activity. The structure-activity relationship was also studied. 展开更多
关键词 4 4-dimethyl-3-isoxazolidinone SULFONYLUREA Acetohydroxyacid synthase Herbicidal activity
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A new tetracyclic triterpenoid from endophytic fungus Fusarium sporotrichioides
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作者 Yajing Wang Chunyue Liu +2 位作者 Yihui Yang Chang Li Yuehu Pei 《Chinese Herbal Medicines》 CAS 2024年第2期231-234,共4页
Objective: To isolate bioactive compounds from the endophytic fungus Fusarium sporotrichioides isolated from Rauwolfia yunnanensis, and investigate their pharmacological activities.Methods: The chemical constituents w... Objective: To isolate bioactive compounds from the endophytic fungus Fusarium sporotrichioides isolated from Rauwolfia yunnanensis, and investigate their pharmacological activities.Methods: The chemical constituents were isolated and purified by combining with ODS column chromatography, silica gel column chromatography and by performing semipreparative HPLC. Their structures were established on the basis of 1D NMR(1H-NMR and13C-NMR) and 2D NMR(1H–1H COSY,HSQC, HMBC and NOESY), as well as HRESIMS and comparison with literature data. In addition, the absolute configuration of compound 1 was determined by calculated ECD data.Results: One previously undescribed tetracyclic triterpenoid derivative, named as integracide L(1), 12aacetoxy-4,4-dimethyl-24-methylene-5a-cholesta-8,14-diene-2a,3β,11β-triol(2), 12a-acetoxy-4,4-dime thyl-24-methylene-5a-cholesta-8-momoene-2a,3β,11β-triol(3), 12a-acetoxy-4,4-dimethyl-24-methy lene-5a-cholesta-8,14-diene-3β,11β-triol(4), and 12a-acetoxy-4,4-dimethyl-24-methylene-5acholesta-8-momoene-3β,11β-triol(5) were isolated from F. sporotrichioide. Moreover, compound 1 was rare tetracyclic triterpenoid with single methyl replacement at C-4 position.Conclusion: Compound 1 was a new tetracyclic triterpenoid isolated from the endophytic fungus F.sporotrichioides. In addition, compound 2 could inhibit the growth of three different human cancer cells significantly. Compounds 3 and 5 were found to possess better cytotoxic activities on Hep G-2 cells than the other compounds, with IC50values of(2.8 ± 0.1) and(6.3 ± 0.3) μmol/L respectively. 展开更多
关键词 antitumor Fusarium sporotrichioides integracide L tetracyclic triterpenoid 12a-acetoxy-4 4-dimethyl-24-methylene5a-cholesta-814-diene-2a 3b 11b-triol 12a-acetoxy-4 4-dimethyl-24-methylene5a-cholesta-8-momoene-2a 3b 11b-triol 12a-acetoxy-4 4-dimethyl-24-methylene5a-cholesta-8-momoene-3b 11b-triol
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