查看更多>>摘要：A series of alkyi gallates was synthesized by reacting gallic acid with the corresponding alcohol.Their structures were determined on the basis of spectroscopic data,including NMR and MS.The antifungal activities of these compounds against plant pathogenic fungi in vitro and in vivo were assessed.
查看更多>>摘要：A new arylbenzofuran derivative compound,menthanolic acid A,was isolated from the aerial parts of Mentha canadensis L.The structure was elucidated on the basis of 1D/2D NMR,and HR-ESI-MS spectroscopic data.
查看更多>>摘要：A new phenolic glycoside 1 and three known compounds(2-4)have been isolated from the 95% ethanolic extract of Eucommia ulmoides Oliv.leaves.Their structures were identified as erythro-1-0-methyl-2-O-β-D-gIucopyranosyl-guaiacylglycerol(1),3,5-dimethoxybenzyl alcohol A-O-β-D-glucopyranoside(2),salidroside(3),and dihydroconiferin(4)from spectroscopic data(~1H NMR,~(13)C NMR,HSQC,and HMBC)and using chemical methods.In the in vitro assay,compound 1 displayed potent inhibitory activity against aldose reductase with an IC_(50)value of 7.82 μM.
查看更多>>摘要：A new phenolic glycoside 1,together with two known compounds(2,3),has been isolated from the ethanolic extract of Polygonatum sibiricum F.Delaroche.Its structure was elucidated as(2R)-syringylpropane-1,3-diol-1-O-β-D-glucopyranoside by spectroscopic data(~1H NMR,~(13)C NMR,HSQC,HMBC,and HR-ESI-MS)and chemical evidence.In the in vitro assay,compound 1 displayed potent inhibitory activity against α-glucosidase with an IC_(50)value of 10.90 μМ.
查看更多>>摘要：A previous bioassay-guided fractionation of the active CH2Cl2-soluble layer from the liquid fermentation of Herbidospora daliensis yielded one actinomycete strain,0385M-1~T,which was isolated from sediment samples collected from a city in Taiwan.This resulted in the isolation of a new compound,daliensilin(1),The structure of the isolate were established by spectroscopic methods,including UY,IR,HR-ESI-MS,and extensive ID and 2D NMR techniques,as well as by comparison with literature reports.
查看更多>>摘要：A new compound 1,together with two known compounds(2,3),has been isolated from the ethanoiic extract of Viburnum melanocarpum leaves.Their structures were elucidated by extensive spectroscopic evidence and chemical method,In the in vitro assay,compounds 1 and 3 displayed potent inhibitory activity against α-glucosidase with IC_(50)values of 6.28 μМ and 12.73 μM,respectively.
查看更多>>摘要：A new polyketide,9(E)-3-(5,8-dihydroxynon-3-en-1-yl)-5,6-dihydroxy-2,6-dimethylcyclohex-2-enone(1),and one known compound,5-ch!oroisorotiorin(2),were isolated from the mangrove-derived fungus Phomopsis sp.TJM1-5.Their structures were determined by extensive NMR and MS analyses,while the absolute configurations of C-5 and C-6 were established based on experimental and calculated electronic circular dichroism spectra.Compound 2 was isolated from the genus of Phomopsis for the first time.Compounds 1 and 2 were evaluated for their antibacterial activity against five pathogenic bacteria.
查看更多>>摘要：Two new depsidones,diffractione В(1)and salazinin A(2),and two known compounds,the dibenzofuran derivative usnic acid(3)and depsidone salazinic acid(4),were isolated from Parmelia saxatilis.The structures of the isolated compounds were identified by spectral analysis and comparison with literature data.
查看更多>>摘要：Two phloroglucinol derivatives were isolated from the twigs and leaves of Syzygium brachyantherum.Their structures were elucidated based on extensive spectroscopic data.They exhibited weak inhibitory activities against α-glucosidase and PTPIB.
查看更多>>摘要：A new monoterpenoid glycoside,together with seven known aliphatic acid derivatives,was isolated from the twigs and leaves of Syzygium fluviatile.Their structures were elucidated by means of NMR and HR-ESI-MS data and comparison with the reported values.This is the first example of a monoterpenoid glycoside from Syzygium plants.
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