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Indole Glycosides from Aqueous Fraction of Strychnos nitida

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Natural Products and Bioprospecting 2016年第6期6卷 285-290页

作者： Bei Wang Zhi Dai Lu liu Xin Wei Pei-Feng Zhu Hao-Fei Yu ya-ping liu Xiao-Dong Luo State Key Laboratory of Phytochemistry and Plant Resources in West China Chinese Academy of SciencesKunming 650201China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Animal Models and Human Disease Mechanisms Kunming Institute of ZoologyChinese Academy of sciencesKunming 650223YunnanChina Yunnan Key Laboratory of Natural Medicinal Chemistry Chinese Academy of SciencesKunming 650201China

Three new indole glycosides 22-deoxystrictosamide(1),22-deoxystrictosamide Nb-oxide(2)and vincosamide 20-O-b-D-xylopyranoside-11-O-b-D-glucopyranoside(3),together with four known analogues were isolated from aqueous fraction of Strychnos nitida.Their structures were elucidated on the basis of extensive analysis of spectroscopic data.All the alkaloids were tested for their cytotoxic activity,but they did not show any exciting result.

关键词： Strychnos nitida Indole glycosides Alkaloids

Physical layer security of underlay cognitive radio using maximal ratio combining

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Frontiers of Information Technology & Electronic Engineering 2016年第9期17卷 929-937页

作者： Hui ZHAO Dan-yang WANG Chao-qing TANG ya-ping liu Gao-feng PAN Ting-ting LI Yun-fei CHEN School of Electronic and Information Engineering Southwest University School of Electrical & Electronic Engineering Newcastle University School of Mathematics and Statistics Southwest University School of Engineering University of Warwick

We investigate the secrecy outage performance of maximal ratio combining(MRC) in cognitive radio networks over Rayleigh fading channels. In a single-input multiple-output wiretap system, we consider a secondary user(SU-TX) that transmits confidential messages to another secondary user(SU-RX) equipped with M(M ≥ 1)antennas where the MRC technique is adopted to improve its received signal-to-noise ratio. Meanwhile, an eavesdropper equipped with N(N ≥ 1) antennas adopts the MRC scheme to overhear the information between SU-TX and SU-RX. SU-TX adopts the underlay strategy to guarantee the service quality of the primary user without spectrum sensing. We derive the closed-form expressions for an exact and asymptotic secrecy outage probability.

关键词：最大比合并物理层安全认知无线电衬底瑞利衰落信道单输入多输出无线电网络 MRC

Chemical Constituents from the Stems of Ecdysanthera rosea

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Natural Products and Bioprospecting 2014年第6期4卷 319-323页

作者： Chang-Wei Song Paul-Keilah Lunga Xu-Jie Qin Gui-Guang Cheng ya-ping liu Xiao-Dong Luo State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Laboratory of Phytobiochemistry and Medicinal Plants Study Department of BiochemistryFaculty of ScienceUniversity of Yaounde 1P.O.Box 812YaoundeCameroon

One new eudesmane sesquiterpenoid(1)named ecdysantherol A and two new benzene derivatives ecdysantherols B(2)and C(3),together with five known benzene derivatives(4–8)were isolated from the stems of Ecdysanthera rosea.The structures of the new compounds were elucidated by extensive spectroscopic methods and X-ray diffraction.The known compounds were identified by the comparison of their spectroscopic data with reported literature data.Compound 1 showed moderate antibacterial activity against the Providensia smartii with MIC value of 12.5 lg/mL.

关键词： Ecdysanthera rosea Sesquiterpenoid Phenolic glycoside Absolute configuration

Monoterpenoid Indole Alkaloids from Inadequately Dried Leaves of Alstonia scholaris

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Natural Products and Bioprospecting 2015年第4期5卷 185-193页

作者： Xu-Jie Qin Yun-Li Zhao Chang-Wei Song Bei Wang Ying-Ying Chen Lu liu Qiong Li Dan Li ya-ping liu Xiao-Dong Luo State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China

Six new indole alkaloids,named alstoniascholarines L–Q(1–6),together with nineteen known analogues were isolated from the inadequately dried leaves of Alstonia scholaris.Their structures were elucidated on the basis of extensive analysis of spectroscopic data and by comparison of their physical and spectroscopic data with the literature values.In addition,the new alkaloids were tested for their cytotoxic and neurite outgrowth-promoting activities.

关键词： Alstonia scholaris Inadequately dried leaves Indole alkaloids Alstoniascholarine Bioactivities

Spiralosides A–C, Three New C_(27)-Steroidal Glycoalkaloids from the Fruits of Solanum spirale

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Natural Products and Bioprospecting 2016年第4期6卷 225-231页

作者： Dan Li Yun-Li Zhao Xu-Jie Qin Lu liu Xing-Wei yang Ying-Ying Chen Bei Wang Xin Wei ya-ping liu Xiao-Dong Luo State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China University of Chinese Academy of Sciences Beijing 100039China

Three new C_(27)-steroidal glycoalkaloids,spiralosides A–C(1–3),were obtained from the total alkaloids of Solanum spirale by chromatographic methods.On the basis of spectroscopic evidence,spiralosides A–C were elucidated as(22R,25S)-22,26-epiminocholest-5-ene-3β,16a-diol-N-acetyl-3-O-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranosyl(1),(22R,25S)-22,26-epiminocholest-5-ene-3β,16α-diol-N-acetyl-3-O-β-D-glucopyranosyl(2),(22R,25S)-22,26-epiminocholest-3β,16α-diol-N-acetyl-3-O-β-D-glucopyranosyl(3),respectively.The total alkaloids of S.spirale have been screened for their antitussive and expectorant effects in intact animal model.

关键词： Solanaceae Solanum spirale Spiralosides A-C

Limonoid and Steroidal Saponin from Azadirachta indica

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Natural Products and Bioprospecting 2014年第6期4卷 335-340页

作者： Lu liu Yun-Li Zhao Gui-Guang Cheng Ying-Ying Chen Xu-Jie Qin Chang-Wei Song Xing-Wei yang ya-ping liu Xiao-Dong Luo State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Yunnan Institute of Food Safety Kunming University of Science and TechnologyKunming 650500People’s Republic of China

A new limonoid,17-(5-methoxy-2-oxofuran-3-yl)-28-deoxonimbolide(1),and a new C21 steroidal saponin,2a,4a-dihydroxy-pregn-5-en-16-one-3a-O-D-glucopyranoside(2),together with 11 known compounds were isolated from the methanol extract of the leaves of Azadirachta indica.The structures were elucidated by means of spectroscopic analysis and putative biosynthetic origins.All the compounds were evaluated for their antibacterial activities against six bacterial strains.

关键词： Azadirachta indica Limonoid Steroidal saponin Antibacterial activiti

Chemical components of Dysoxylum densiflorum

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Natural Products and Bioprospecting 2013年第2期3卷 66-69页

作者： Ji GU Sheng-yan QIAN Gui-Guang CHENG yan LI ya-ping liu Xiao-Dong LUO State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China University of Chinese Academy of Sciences Beijing 100049China

Three new diterpenoids,including two halimanes,5(10),13E-halimadiene-3α,15-diol(1),and 5(10),14-halimadiene-3α,13ξ-diol(2),one labdane,12-(3-methyl-furan)-labd-8(17)-en-19-oic acid(3),together with sixteen known compounds were isolated from the barks of Dysoxylum densiflorum.All compounds were elucidated by extensive spectroscopic analysis.

关键词： halimane labdane Dysoxylum densiflorum

Novel indole and quinoline alkaloids from Melodinus yunnanensis

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Natural Products and Bioprospecting 2011年第1期1卷 25-28页

作者： Xiang-Hai CAI yan LI Jia SU ya-ping liu Xiao-Ning LI Xiao-Dong LUO State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China

6/7-Seco rearranged spiro-indolone alkaloids,meloyunines A(1)and B(2)and a monoterpenoid quinoline alkaloid meloyunine C(3)together with its possible intermediate 14,15-dehydromelohenine B(4),and their precursorΔ14-vincamenine(5)were isolated from Melodinus yunnanensis.All structures were elucidated based on NMR,FTIR,UV,and MS spectroscopic data.The isolation of monoterpenoid indole,quinoline,and its immediate from the same plant chemically supported the biosynthesis of quinoline from indole.Compound 2 was cytotoxic against several human cancer cell lines.

关键词： spiro-indolone quinoline meloyunine Melodinus yunnanensis

The Anticancer Activities Phenolic Amides from the Stem of Lycium barbarum

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Natural Products and Bioprospecting 2017年第6期7卷 421-431页

作者： Pei-Feng Zhu Zhi Dai Bei Wang Xin Wei Hao-Fei Yu Zi-Ru yan Xu-Dong Zhao ya-ping liu Xiao-Dong Luo State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Yunnan Key Laboratory of Natural Medicinal Chemistry Kunming 650201People’s Republic of China Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences/Key Laboratory of Bioactive Peptides of Yunnan Province Kunming Institute of ZoologyKunming 650223YunnanChina

Four new phenolic amides,4-O-methylgrossamide(1),(E)-2-(4,5-dihydroxy-2-{3-[(4-hydrox-yphenethyl)amino]-3-oxopropyl}-phenyl)-3-(4-hydroxy-3-methoxyphenyl)-N-(4-hydroxyphenethyl)acryl-amide(2),(Z)-lyciumamide C(3),(Z)-thoreliamide B(4),together with thirteen known phenolic amides were identified from the stem of Lycium barbarum.The structures of the new compounds were determined by spectroscopic methods.All compounds were evaluated for their anti-cancer activities against human glioma stem cell lines.

关键词： Lycium barbarum Phenolic amides Anticancer activities Glioma stem cell