As a part of our interest in biologically active germacranolides from the genus Carpesium (Compositae), we have investigated the constituents of Carpesium cernuum. This paper reports the isolation and structural eluci...As a part of our interest in biologically active germacranolides from the genus Carpesium (Compositae), we have investigated the constituents of Carpesium cernuum. This paper reports the isolation and structural elucidation of a new germacranolide, cemolide A (Compound 1), from the herb. The structure of Compound 1 was determined as 2α,3β-dihydroxy-9-angeloxygermacra-4-en-6,12-olide on the basis of spectral evidence. The skeleton of Compound 1 was elucidation by IR, MS, 1H and 13C NMR, COSY, HMQC and HMBC experiments. The stereochemistry of Compound 1 was deduced by ROESY spectral data. Finally, the procedures of extraction and isolation were described in detail.展开更多
In this study,three new germacranolide sesquiterpenes(1–3),together with six related known analogues(4–9)were isolated from the whole plant of Carpesium cernuum.Their structures were established by a combination of ...In this study,three new germacranolide sesquiterpenes(1–3),together with six related known analogues(4–9)were isolated from the whole plant of Carpesium cernuum.Their structures were established by a combination of extensive NMR spectroscopic analysis,HR-ESIMS data,and ECD calculations.The anti-leukemia activities of all compounds towards three cell lines(HEL,KG-1a,and K562)were evaluated in vitro.Compounds 1–3 exhibited moderate cytotoxicity with IC50 values ranging from 1.59 to 5.47μmol·L^(−1).Mechanistic studies indicated that 2 induced apoptosis by decreasing anti-apoptotic protein Bcl-2 and activating the caspase family in K562 cells.These results suggest that compound 2 is a potential anti-leukemia agent.展开更多
文摘As a part of our interest in biologically active germacranolides from the genus Carpesium (Compositae), we have investigated the constituents of Carpesium cernuum. This paper reports the isolation and structural elucidation of a new germacranolide, cemolide A (Compound 1), from the herb. The structure of Compound 1 was determined as 2α,3β-dihydroxy-9-angeloxygermacra-4-en-6,12-olide on the basis of spectral evidence. The skeleton of Compound 1 was elucidation by IR, MS, 1H and 13C NMR, COSY, HMQC and HMBC experiments. The stereochemistry of Compound 1 was deduced by ROESY spectral data. Finally, the procedures of extraction and isolation were described in detail.
基金supported by the Science and Technology Department of Guizhou Province(No.QKHJC[2016]1002,81872772,81960546,and U1812403)the National Natural Science Foundation of China(Nos.81872772,81960546,and U1812403)+1 种基金the Science and Technology Department of Anshun City(No.ASKP[2019]3)the 100 Leading Talents of Guizhou Province(fund for LI Yan-Mei,Nos.P2018-KF11 and QZYY-019-022).
文摘In this study,three new germacranolide sesquiterpenes(1–3),together with six related known analogues(4–9)were isolated from the whole plant of Carpesium cernuum.Their structures were established by a combination of extensive NMR spectroscopic analysis,HR-ESIMS data,and ECD calculations.The anti-leukemia activities of all compounds towards three cell lines(HEL,KG-1a,and K562)were evaluated in vitro.Compounds 1–3 exhibited moderate cytotoxicity with IC50 values ranging from 1.59 to 5.47μmol·L^(−1).Mechanistic studies indicated that 2 induced apoptosis by decreasing anti-apoptotic protein Bcl-2 and activating the caspase family in K562 cells.These results suggest that compound 2 is a potential anti-leukemia agent.
