Four new sesquiterpenoids,artemyrianins A-D(1-4),and three new norlignans,artemyrianins E-G(5-7),together with five known compounds(8-12),were isolated from the aerial parts of Artemisia myriantha(Asteraceae).The new ...Four new sesquiterpenoids,artemyrianins A-D(1-4),and three new norlignans,artemyrianins E-G(5-7),together with five known compounds(8-12),were isolated from the aerial parts of Artemisia myriantha(Asteraceae).The new compounds were established by spectroscopic data analyses(HRMS,IR,1D and 2D NMR),and their absolute configurations were confirmed by the single-crystal X-ray diffraction or ECD calculations.The isolates showed cytotoxicity against HepG2 cells with IC50 values ranging from 33.3 to 145.2μM.展开更多
This study reports an investigation into the chemical constituents of the whole plant of Selaginella moellendorffii Hieron.Ten compounds,isolated and purified by column chromatography,were identified on the basis of s...This study reports an investigation into the chemical constituents of the whole plant of Selaginella moellendorffii Hieron.Ten compounds,isolated and purified by column chromatography,were identified on the basis of spectral analysis and their physicochemical properties to be:(8R)-3,5-dimethoxy-4-hydroxyphenylpropylalcohol-8-(1-acetyl-3-methoxy-4-hydroxyphenyl)-9-O-b-D-glucopyranoside(moellenoside B)(1),amentoflavone(2),hinokiflavone(3),apigenin-7-O-bneohesperidoside(4),apigenin-8-C-b-D-glucopyranoside(5),adenosine(6),uridine(7),2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic acid(8),vanillic acid(9),and lariciresinol(10).Compound 1 is a new norlignan lignanoside and compounds 4–10 were isolated from this plant for the first time.展开更多
(±)-Crataegusnorin A(la/1b) and B(2a/2b),two pairs of rare 8,9’-epoxy-type norlignan enantiomers featuring a y-butyrolactone ring,were isolated from the fruit of Crataegus pinnatifida.Their structures were deter...(±)-Crataegusnorin A(la/1b) and B(2a/2b),two pairs of rare 8,9’-epoxy-type norlignan enantiomers featuring a y-butyrolactone ring,were isolated from the fruit of Crataegus pinnatifida.Their structures were determined via extensive spectroscopic analyses.Gauge-independent atomic orbital(GIAO) NMR chemical shift calculations,combined with the advanced statistical method DP4+were employed to establish the relative configurations of four compounds.Next,chiral separation was accomplished by chiral chromatographic column and the absolute configurations of the four compounds were unambiguously assigned by comparison between their experimental electronic circular dichroism curves with the quantum-mechanically calculated curves based on time-dependent density functional theory(TDDFT).All the isolates were evaluated fo r their neuroprotective activities against H2O2-induced cell injury in human neuroblastoma SH-SY5Y cells.The results showed that two pairs of enantiomers 1a/1b and 2a/2b displayed diff;erent effect on neuroprotective activity.Among them,compound 2a displayed the most potent neuroprotective effect Further flow cytometry analysis indicated that 2a could protect SH-SY5Y cells from oxidative damage through inhibiting cell apoptosis.展开更多
基金supported by the Yunnan Wanren Project(YNWR-KJLJ-2019-002)the Program of Yunling Scholarship,the Reserve Talents of Young and Middle-aged Academic and Technical Leaders in Yunnan Province,and the Youth Innovation Promotion Association,CAS(2013252).
文摘Four new sesquiterpenoids,artemyrianins A-D(1-4),and three new norlignans,artemyrianins E-G(5-7),together with five known compounds(8-12),were isolated from the aerial parts of Artemisia myriantha(Asteraceae).The new compounds were established by spectroscopic data analyses(HRMS,IR,1D and 2D NMR),and their absolute configurations were confirmed by the single-crystal X-ray diffraction or ECD calculations.The isolates showed cytotoxicity against HepG2 cells with IC50 values ranging from 33.3 to 145.2μM.
基金supported by the National Natural Science Foundation of China(81073034)National Key Technologies R&D Program of China(2009ZX09103-440)Major Public Research Project of Henan Province(081100910800)。
文摘This study reports an investigation into the chemical constituents of the whole plant of Selaginella moellendorffii Hieron.Ten compounds,isolated and purified by column chromatography,were identified on the basis of spectral analysis and their physicochemical properties to be:(8R)-3,5-dimethoxy-4-hydroxyphenylpropylalcohol-8-(1-acetyl-3-methoxy-4-hydroxyphenyl)-9-O-b-D-glucopyranoside(moellenoside B)(1),amentoflavone(2),hinokiflavone(3),apigenin-7-O-bneohesperidoside(4),apigenin-8-C-b-D-glucopyranoside(5),adenosine(6),uridine(7),2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic acid(8),vanillic acid(9),and lariciresinol(10).Compound 1 is a new norlignan lignanoside and compounds 4–10 were isolated from this plant for the first time.
基金supported by Career Development Support Plan for Young and Middle-aged Teachers in Shenyang Pharmaceutical University(No.ZQN2018006)the Project of Innovation Team Foundation(No.LT2015027)。
文摘(±)-Crataegusnorin A(la/1b) and B(2a/2b),two pairs of rare 8,9’-epoxy-type norlignan enantiomers featuring a y-butyrolactone ring,were isolated from the fruit of Crataegus pinnatifida.Their structures were determined via extensive spectroscopic analyses.Gauge-independent atomic orbital(GIAO) NMR chemical shift calculations,combined with the advanced statistical method DP4+were employed to establish the relative configurations of four compounds.Next,chiral separation was accomplished by chiral chromatographic column and the absolute configurations of the four compounds were unambiguously assigned by comparison between their experimental electronic circular dichroism curves with the quantum-mechanically calculated curves based on time-dependent density functional theory(TDDFT).All the isolates were evaluated fo r their neuroprotective activities against H2O2-induced cell injury in human neuroblastoma SH-SY5Y cells.The results showed that two pairs of enantiomers 1a/1b and 2a/2b displayed diff;erent effect on neuroprotective activity.Among them,compound 2a displayed the most potent neuroprotective effect Further flow cytometry analysis indicated that 2a could protect SH-SY5Y cells from oxidative damage through inhibiting cell apoptosis.
