细茎石斛的化学成分

从兰科植物细茎石斛(Dendrobiummoniliforme(L.)Sw.)中分得一个新的联苄类化合物(moniliformine),以及6个已知化合物(a-dihydropicrotoxinin、对羟基顺式肉桂酸三十烷基酯、反式阿魏酸二十八烷基酯、b-谷甾醇、胡萝卜苷和二十九烷烃),经光谱解析(UV、IR、MS、1H-NMR、13C-NMR、DEPT、HMQC和COLOC),新化合物的结构被确定为3,4-二羟基-5,4'-二甲氧基联苄(3,4-dihydroxy-5,4'-dimethoxybibenzyl)。a-dihydropicrotoxinin为首次从自然界分离得到。     

尖刀唇石斛化学成分研究

本文对尖刀唇石斛(Dendrobium heterocarpum Lindl.)中的化学成分及其抗炎和抗氧化活性进行研究。实验采用硅胶、Sephadex LH-20凝胶和高效液相色谱等手段进行分离纯化,并用波谱学方法鉴定化合物结构,从尖刀唇石斛的乙酸乙酯萃取部位中分离得到15个化合物,分别鉴定为3,4′-二羟基-5-甲氧基联苄(1)、batatasinⅢ(2)、3-羟基-4′,5-二甲氧基联苄(3)、3-O-methylgigantol(4)、gigantol(5)、3,4-二羟基-4′,5-二甲氧基联苄(6)、moscatilin(7)、dendrocandin A(8)、(S)-3,4,α-三羟基-4′,5-二甲氧基联苄(9)、densiflorol A(10)、dendrocandin I(11)、dendrocandin F(12)、coelonin(13)、红花素(14)、4-羟基-2-甲氧基-3,6-二甲基苯甲酸(15)。化合物1～15均为首次从该种植物中分离得到,其中化合物14为首次从该属植物中分离得到。化合物3、 5、 11具有抑制小鼠RAW264.7巨噬细胞生成一氧化氮的作用;化合物5具有较好的ABTS自由基清除能力,化合物6具有较好的DPPH自由基清除能力。     

晶帽石斛的化学成分研究

该研究利用硅胶、凝胶、MCI、中压制备色谱(MPLC)和高效液相半制备色谱(semi-HPLC)等方法,对晶帽石斛(Dendrobium crystallinum)进行了化学成分研究。结果表明:提纯、分离共得到10个化合物,经波谱数据分析及与文献数据对照,分别鉴定为石斛酚(1),3,4'-二羟基-5-甲氧基联苄(2),3,4',5-三羟基-3-甲氧基联苄(3),二氢藜芦醇(4),安告佛醇(5),3',5,7-三羟基-4'-甲氧基黄烷酮(6),4',5,7-三羟基-6-甲氧基黄烷酮(7),丁香树脂醇(8),β-谷甾醇(9),β-胡萝卜苷(10)。其中,除化合物2和化合物10以外,其余8个化合物均在该种植物中首次发现。     

黄药子的化学成分研究

综合利用各种色谱方法对黄药子的乙醇提取物进行分离,从中共得到23个化合物。通过波谱分析结合文献数据比对,将它们的结构分别鉴定为:2,7-二羟基-3,4-二甲氧基菲(1)、7-羟基-2,3,4-三甲氧基菲(2)、3,7-二羟基-2,4-二甲氧基-9,10-二氢菲(3)、3-羟基-2,4,7-三甲氧基-9,10-二氢菲(4)、2-羟基-3,4,7-三甲氧基-9,10-二氢菲(5)、7-羟基-2,3,4-三甲氧基-9,10-二氢菲(6)、7-羟基-2,4-二甲氧基-9,10-二氢菲(7)、2-羟基-4,7-二甲氧基-9,10-二氢菲(8)、2,7-二羟基-3,4-二甲氧基-9,10-二氢菲(9)、2'-羟基-3,4,5-三甲氧基联苄(10)、2',3-二羟基-4,5-二甲氧基联苄(11)、3-羟基-4,5-二甲氧基联苄(12)、3,5-二羟基-4-甲氧基联苄(13)、pteryxin(14)、praeruptorin A(15)、山柰酚(16)、7,3',4'-三羟基-3,5-二甲氧基黄酮(17)、黄独乙素(18)、diosbulbin G(19)、3-羟基-β-突厥酮(20)、(6S,9S)-吐叶醇(21)、(6S,9R)-吐叶醇(22)和blumenol B(23)。其中,化合物4~8、10、12~15、20~23共14个化合物均为首次从该植物中分离得到。     

百两金的化学成分

从百两金(Ardisia crispa(Thunb.)A.DC.)的根及茎乙醇提取物中分离得到了8个化合物,通过MS和NMR等方法鉴定为(7S,7′R)-双(3,4-亚甲二氧苯基)-rel-(8R,8′R)-二甲基四氢呋喃(1),(-)-襄五脂素(2),(7S,8S,7′R,8′R)-3,4-亚甲二氧基-3′,4′-二甲氧基-7,7′-环氧脂素(3),异安五脂素(4),α-菠甾醇(5),26-羟基二十六烷酸甘油酸酯(6),百两金皂苷B(7),岩白菜素(8)。其中有化合物1~6为首次从该种植物中分离得到。     

紫茎泽兰中的酚类化学成分

从紫茎泽兰(Eupatorium adenophorum Spreng.)乙醇提取物中分离得到11个酚类化合物。通过波谱分析,分别鉴定为咖啡酸(1)、阿魏酸(2)、芥子醛(3)、苯乙基阿魏酯(4)、3,4-二羟基苯甲酸(5)、4-羟基-3-甲氧基苯甲酸(6)、3,4-二甲氧基苯甲酸(7)、没食子酸(8)、3-(3,4-二羟基苯基)-1-丙醇(9)、2-香豆酸-β-D-吡喃葡萄糖苷(10)和4-O-β-D-葡萄糖苷-3,5-二甲氧基苯基-乙基酮(11)。化合物3~9和11为首次从紫茎泽兰中分离得到。     

瑞香狼毒化学成分研究

从瑞香狼毒95%乙醇提取物中分离得到了17个化合物,根据理化性质和波谱数据鉴定为4’-甲氧基-7-羟基黄酮(1),山奈酚(2),5,4’-二羟基-7-甲氧基二氢黄酮(3),4’,5,7-三羟基黄烷酮(4),3,5,7-三羟基黄烷酮(5),山奈酚-7-O-β-D-葡萄糖苷(6),α-香树酯醇(7),(24R)-5α-豆甾-7,22(E)-二烯-3α-醇(8),狼毒色原酮(9),伞形花内酯(10),东莨菪素(11),异东莨菪素(12),狼毒素(13),瑞香内酯(14),异茴芹香豆素(15),β-谷甾醇(16),瑞香素乙(17)和β-胡萝卜甙(18)。其中化合物1-8为首次从该植物中分离得到。     

霍山石斛化学成分研究

研究霍山石斛Dendrobium huoshanense Tang et Cheng茎的化学成分。应用硅胶、Sephadex LH-20、MCI-gel、Rp-18结合Semi-prep HPLC技术进行分离纯化,从霍山石斛茎中分离得到29个化合物,分别鉴定为4,4′-二羟基-3,5-二甲氧基联苄(1)、batatasin Ⅲ(2)、5,4′-二羟基-3-甲氧基联苄(3)、二氢松柏醇二氢对羟基桂皮酸酯(4)、对羟基苯丙酸甲酯(5)、二氢松柏醇(6)、二氢阿魏酸(7)、松柏醛-4-O-β-D-吡喃葡萄糖苷(8)、4-烯丙基-2,6-二甲氧-苯基葡萄糖苷(9)、erythrosyringoylglycerol-4-O-β-D-glucopyranoside(10)、3,4,5-trihydroxyallylbenzene-3-O-β-D-glucopyranosyl-4-O-β-D-glucopyranoside(11)、(7S,8R)syringylglycerol-8-O-4′-sinapyl ether 4-O-β-D-glucopyranoside(12)、3,4-二羟基-5-甲氧基苯甲醛(13)、对羟基苯甲酸(14)、5-hydroxylated isobenzofuran-1(3H)-one(15)、3,5-二甲氧基-4-羟基-苯甲醛(16)、4-羟基-3-甲氧基苯甲醛(17)、3,4,5-trimethoxyphenol-1-O-β-D-glucopyranoside(18)、天麻苷(19)、丁香脂素(20)、丁香脂素-4-O-β-D-葡萄糖苷(21)、丁香脂素-4,4′-O-β-D-二葡萄糖苷(22)、柚皮素(23)、2,6-二甲氧基对苯醌(24)、5-羟甲基糠醛(25)、tetrahydro-5-oxo-2-furancarboxylic acid methyl ester(26)、焦谷氨酸甲酯(27)、川芎哚(28)和尿嘧啶核苷(29)。其中化合物5～19、21～29位为首次从该植物中分离得到,化合物8、10、11、15、16、18、26、28为首次从石斛属中分离得到。     

买麻藤化学成分的研究

从买麻藤(Gnetum montanum Markgr)的藤茎中分离鉴定出4个新化合物:2-羟基(?)甲氧基-4-甲氧羰基吡咯(1),2-羟基-3-甲氧甲基-4-甲氧羰基吡咯(2),3,4-二羟基-4-(?)氧基二苄醚(3)和3,3',4'-三羟基-4-甲氧基二苄醚(4)以及两个已知化合物2,3-二苯基吡咯(5)和胺甲基甲醇(6)。化合物(1)、(2)和(6)是以盐酸盐形式分离得到。     

杭白菊的化学成分研究：两个新三萜酯的结构测定

从杭白菊(Dendranthema morifolium (Ramat. )Tzvel.)的乙醚部分分离出13个化合物。运用波谱技术和化学方法证明其中2个为新化合物,命名为棕榈酸16β,22α-二羟基假蒲公英甾醇酯(1)和棕榈酸16β,28-二羟基羽扇醇酯(2)。     

Antifungal dibenzofuran bis(bibenzyl)s from the liverwort Asterella angusta

Bioactivity-guided separation of an antifungal extract from the liverwort Asterella angusta afforded four bis(bibenzyl)s, asterelin A (1), asterelin B (2), 11-O-demethyl marchantin I (3), and dihydroptychantol A (4), together with six known ones. Their structures were established by extensive spectroscopic analysis (1D and 2D-NMR, MS), and that of 2 was confirmed by X-ray crystallographic diffraction analysis. Compounds 1 and 2 are the first examples of dibenzofuran bis(bibenzyl)s. The antifungal activity of the isolated bis(bibenzyl)s against the common clinical pathogenic fungus Candida albicans was evaluated using both the thin-layer chromatography bioautographic assay and the broth microdilution method. They showed moderate antifungal activities with minimal inhibitory concentration (MIC) values ranging from 16 microg/ml to 512 microg/ml.     

New Cytotoxic Bibenzyl and Other Constituents from Bauhinia ungulata L. (Fabaceae)

A new bibenzyl, 2′‐hydroxy‐3,5‐dimethoxy‐4‐methylbibenzyl ( 1 ) and four known compounds identified as 2′‐hydroxy‐3,5‐dimethoxybibenzyl ( 2 ), liquiritigenin ( 3 ), guibourtinidol ( 4 ) and fisetinidol ( 5 ) were isolated from the roots of Bauhinia ungulata L. Phytochemical investigations of the stems of B. ungulata led to the isolation of the known compounds identified as liquiritigenin ( 3 ), guibourtinidol ( 4 ), fisetinidol ( 5 ), taraxerol ( 6 ), betulinic acid ( 7 ), taraxerone ( 8 ), glutinol ( 9 ), a mixture of sitosterol ( 10 ) and stigmasterol ( 11 ), pacharin ( 12 ), naringenin ( 13 ) and eriodictyol ( 14 ). The structures of these compounds were elucidated on the basis of their spectral data (IR, MS, 1D‐ and 2D‐NMR). The cytotoxicity of the bibenzyl 1 has been evaluated against four human cancer cell lines, showing the IC₅₀ values of 4.3 and 6.5 μg ml^?1 against pro‐myelocytic leukemia (HL‐60) and cervical adenocarcinoma (HEP‐2) cell lines, respectively. This article also registers for the first time the ¹³C‐NMR data of the known bibenzyl 2 .     

Bibenzyls from Radula tokiensis and R. Japonica

A new bibenzyl having a dihydrooxepin ring was isolated from the acetone extract of the liverwort Radula tokiensis, together with the previously known 5 bibenzyls and 3 sesquiterpenes, trans-β-farnesene, cuparene and (Jcuparenol. Two known bibenzyls were isolated from R. japonica. The bibenzyl derivatives are significant chemosystematic markers of the Radulaceae.     

Eremophilanolides and other constituents from the Argentine liverwort Frullania brasiliensis.

Two eremophilanolides, 5-epidilatanolides A and B, as well as a new natural bibenzyl were isolated from an Argentine collection of the liverwort Frullania brasiliensis, along with the known eudesmane-type sesquiterpene lactones nepalensolide A, nepalensolide B, (+)-frullanolide, and (+)-dihydrofrullanolide, the hopanoid zeorin, the four sterols stigmasta-4,22-dien-3,6-dione, stigmasta-4,22-dien-3-one, stigmasterol, and sitosterol, and a trace amount of atraric acid. The structure and stereochemistry of the eremophilanolides and the bibenzyl were established by a combination of extensive NMR spectroscopy experiments and X-ray crystallographic analysis. Absolute configurations of the new compounds were derived on the basis of CD spectra.     

Bibenzyl and phenolic glycosides from Pterospermum heterophyllum

A new bibenzyl, heterophyllic acid (1), and three new phenolic glycosides, heterophylloside A–C (2–4), along with two known phenolic glycosides oldhamioside (5) and 6′-O-vanilloylisotachioside (6) were isolated from Pterospermum heterophyllum. The structures of these compounds were elucidated on the basis of 1D, 2D NMR, MS spectroscopic analysis, and chemical methods. Their cytotoxic activities against KB and MCF-7 cancer cell lines were evaluated. Compound 2 showed significant cytotoxic activities.     

Bibenzyls and dihydroisocoumarins from white salsify (Tragopogon porrifolius subsp. porrifolius)

A phytochemical investigation of three accessions of Tragopogon porrifolius L. subsp. porrifolius (Asteraceae, Lactuceae) yielded three new bibenzyl derivatives, 5,4'-dihydroxy-3-alpha-l-rhamnopyranosyl-(1-->3)-beta-d-xylopyranosyloxybibenzyl, 2-carboxyl-3,4'-dihydroxy-5-beta-d-xylopyranosyloxybibenzyl, tragopogonic acid (2'carboxyl-3',5',4'-trihydroxyphenylethanone) and three dihydroisocoumarin derivatives, including the new natural product 6-O-methylscorzocreticoside I. One of the isolated bibenzyl derivatives is considered to be a precursor to the biosynthesis of dihydroisocoumarins. Structures of new compounds were established by HR mass spectrometry, extensive 1D and 2D NMR spectroscopy, and CD spectroscopy. Moreover, radical scavenging activities of the polyphenolic compounds were measured using the 2,2-diphenyl-1-picrylhydrazyl assay; two of the bibenzyls showed moderate and two of the dihydroisocoumarins showed weak radical scavenging activities. The chemosystematic impact of bibenzyls and dihydroisocoumarins is discussed briefly.     

A new bibenzyl from Dendrobium secundum

From the aerial parts of Dendrobium secundum, a new bibenzyl, namely 4,5,4'-trihydroxy-3,3'-dimethoxybibenzyl, was isolated, along with four known compounds which included brittonin A, moscatilin, syringaresinol, and ferulic acid. All of these isolates showed appreciable DPPH free radical scavenging potential, except for brittonin A, which was devoid of activity.     

Phenolic compounds from the rhizomes of Dioscorea bulbifera

One new bibenzyl, 7, and one new diarylheptanone, diobulbinone A (18), together with sixteen known compounds, 1-6 and 8-17, have been isolated form the rhizomes of Dioscorea bulbifera. Their structures were elucidated by NMR and MS analyses. Compound 7 showed high antioxidant capacity in FRAP assay and DPPH radical-scavenging activity.     

Ficuschlorins A - D, lactone Chlorins from the leaves of ficus microcarpa

Four new lactone chlorins, ficuschlorins A – D ( 1 – 4 , resp.), and six known pheophytins were isolated from the leaves of Ficus microcarpa. The structures of these compounds were determined by 1D‐ and 2D‐NMR spectroscopy, and other techniques. New natural pheophytins were rarely obtained. In the past ten years, only three new pheophytins were isolated from natural sources.