Four new neo-lignans were isolated from the chloroform portion of 70% ethanol extract of the seed crusts of Trewia nudiflora L., and were determined to be 9'-methoxy-7'-en-3',8:4',7-di-epoxyneolignan-3...Four new neo-lignans were isolated from the chloroform portion of 70% ethanol extract of the seed crusts of Trewia nudiflora L., and were determined to be 9'-methoxy-7'-en-3',8:4',7-di-epoxyneolignan-3,4,9-triol l, 9'-methoxy-7'-en-3',7:4',8-diepoxyneolignan-3,4,9-triol 2, 9'- ethoxy-7'-en-3',8:4',7-diepoxyneolignan-3,4,9-triol 3, 9'-butoxy-7'-en-3',8:4',7-diepoxy-neolignan -3,4,9-triol 4, respectively, on the basis of spectral data. The antimicrobial bioassays showed that 4 had evident inhibitory activity against Mycobacterium tuberculosis.展开更多
The phytochemical investigation on the ethanolic extracts of the barks of Taxus yunnanensis (Taxaceae) led to the isolation of two new neo-lignans, named taxuyunins A (1) and B (2), a-long with the known diterpenolign...The phytochemical investigation on the ethanolic extracts of the barks of Taxus yunnanensis (Taxaceae) led to the isolation of two new neo-lignans, named taxuyunins A (1) and B (2), a-long with the known diterpenolignan, brevitaxin (3). Their structures were elucidated on the basis of spectroscopic and chemical evidences. Compound 1 is a neo-lignan xyloside while compound 2 belongs to the rare neo-lignan possessing a ramified C3 side chain.展开更多
文摘Four new neo-lignans were isolated from the chloroform portion of 70% ethanol extract of the seed crusts of Trewia nudiflora L., and were determined to be 9'-methoxy-7'-en-3',8:4',7-di-epoxyneolignan-3,4,9-triol l, 9'-methoxy-7'-en-3',7:4',8-diepoxyneolignan-3,4,9-triol 2, 9'- ethoxy-7'-en-3',8:4',7-diepoxyneolignan-3,4,9-triol 3, 9'-butoxy-7'-en-3',8:4',7-diepoxy-neolignan -3,4,9-triol 4, respectively, on the basis of spectral data. The antimicrobial bioassays showed that 4 had evident inhibitory activity against Mycobacterium tuberculosis.
基金Project supported by the National Natural Science Foundation of China(No.3950081),the Young Academic and Technical Leader Raising Foundation of Yunnan Province(awarded to Hong-Jie Zhang),and the Special Supported Bioscience and Biotechnique Foundation of
文摘The phytochemical investigation on the ethanolic extracts of the barks of Taxus yunnanensis (Taxaceae) led to the isolation of two new neo-lignans, named taxuyunins A (1) and B (2), a-long with the known diterpenolignan, brevitaxin (3). Their structures were elucidated on the basis of spectroscopic and chemical evidences. Compound 1 is a neo-lignan xyloside while compound 2 belongs to the rare neo-lignan possessing a ramified C3 side chain.
