番荔枝化学成分研究

从番荔枝(Annona squamosa)中分离得到12个化合物,分别鉴定为liriodenine(AS—1),穆坪马兜铃酰胺(moupinamide,AS-2),-(-)-kauran-16α-01-19-oic acid(AS-3),16β,17-dihydroxy-(-)-kauran-19-oic acid(AS-4),anonaine(AS-5),16α,17-dihydroxy-(-)-kauran-19-oic acid(AS-6),(-)-isokaur-15(16)-en-17,19-dioic acid(AS-7),番荔枝酰胺squamosamide(AS-8),16α-methoxy-(-)kauran-19-oicacid(AS-9),sachanoic acid(AS-10),(-)-kauran-19-al-17-oic acid(AS-11),daucosterol(AS-12)。其中,番荔枝酰胺(AS-8)是新化合物,AS-9是第一次从植物中得到的天然产物。     

HPLC-RID法测定腺梗豨莶药材中奇壬醇等5种化合物的含量

目的建立测定腺梗豨莶中ent-16β,17,18-三羟基贝壳杉烷-19-羧酸、奇壬醇、ent-17,18-二羟基贝壳杉烷-19-羧酸、豨莶苷、ent-16β,17-二羟基贝壳杉烷-19-羧酸含量的高效液相色谱示差折光检测方法(HPLC-RID)。方法以十八烷基硅烷键合相为固定相,流动相为体积分数0.5%甲酸溶液-乙腈(体积比72∶28),示差检测器光学元件温度为40℃,流速为1.0 mL·min-1。结果 5种化合物线性关系良好(r>0.999),ent-16β,17,18-三羟基贝壳杉烷-19-羧酸和ent-17,18-二羟基贝壳杉烷-19-羧酸的线性范围为0.10⁰.50 g·L-1,奇壬醇的线性范围为0.500.50 g·L-1,奇壬醇的线性范围为0.50².5 g·L-1,豨莶苷的线性范围为0.202.5 g·L-1,豨莶苷的线性范围为0.20¹.0 g·L-1,ent-16β,17-二羟基贝壳杉烷-19-羧酸的线性范围为0.421.0 g·L-1,ent-16β,17-二羟基贝壳杉烷-19-羧酸的线性范围为0.42².1 g·L-1;平均加样回收率在98.3%2.1 g·L-1;平均加样回收率在98.3%¹01.1%内,RSD小于3.5%。结论该方法简便、准确、重复性良好,适用于腺梗豨莶中5种成分的同时测定。     

圆滑番荔枝树皮中的化学成分

目的对番荔枝科植物圆滑番荔枝(Annona glabraLinn.)树皮的化学成分进行分离、鉴定。方法采用硅胶柱、色谱等分离手段;利用理化性质与波谱技术对化合物进行鉴定。结果分得7个化合物,经鉴定为:ent-kauran-16α,17-diol(1),16-αH-ent-kauran-17-oic acid(2),19-hydroxy-16-α(-)-kauran-17-oic acid(3),16-αhydro-19-acetoxy-ent-kauran-17-oic acid(4),liriodenine(5),β-谷甾醇(-βsitosterol,6)和胡萝卜苷(daucosterol,7)。结论化合物26、、7为首次从该植物中分离得到。     

圆滑番荔枝的化学成分研究

目的从番荔枝科植物圆滑番荔枝(annona glabra linn)树皮中分离其化学成分并进行成分分析.方法采用柱层析和红外、核磁共振、质谱仪等进行结构分析.结果分离到6个化合物,其中5个为贝壳杉烷型二萜,1个为生物碱.根据理化性质和波谱特征鉴定其为萜Ⅰ、Ⅱ分别为ent-19-carbomethoxykauran-17-oic acid、19-hydroxy-16α-(-)-kauran-17-oic acid,生物碱Ⅰ、Ⅱ分别为liriodenine、oxoglaucine.结论其中萜Ⅰ ent-19-carbomethoxykauran-17-oic acid、萜Ⅱ19-hydroxy-16α-(一)-kauran-17-oic acid和生物碱Ⅱoxoglaucine为首次从该植物中分得.     

滇钩藤化学成份研究

目的　研究滇钩藤(Uncaria yunnanensis Hsia.C.C)根的化学成分。方法　运用各种色谱技术进行分离,用IR,MS,¹HNMR,¹³CNMR,2DNMR等光谱技术鉴定化合物。结果　得到7个化合物,分别鉴定为:3β,6β,19α-三羟基乌苏酸(I),23,-去甲基24烯-3β,6β,19α-乌苏酸(II),6β,19α-二羟基-乌苏酸-3-酮(III),齐墩果酸(IV),5,7,3′,4′-四羟基-黄烷-3-醇(V),β-育亨宾(VI)和滇钩藤碱I(VII)。结论　VII为新化合物,其余化合物均为首次从该植物中分得。     

玄参的脂溶性化学成分

目的：研究中药玄参(Scrophularia　ningpoensis　Hemsl.)脂溶性部位的化学成分。方法：利用溶剂提取和硅胶等色谱方法对玄参乙醚可溶部位进行分离纯化,通过化学和光谱方法鉴定结构。结果：共分得10个化合物,分别鉴定为3-O-乙酰基-2-O-阿魏酰基-α-L-鼠李糖(I),3-O-乙酰基-2-O-对羟基肉桂酰基-α-L-鼠李糖(II),肉桂酸(III),4-羟基-3-甲氧基苯甲酸(IV),对甲氧基肉桂酸(V),4-羟基-3-甲氧基肉桂酸(VI),5-羟甲基糠醛(VII),熊果酸(VIII),β-谷甾醇(IX),β-谷甾醇葡糖苷(X)。结论：化合物I,II为新化合物。化合物IV,V,VII,VIII为首次从该植物中分得。玄参脂溶性部位含有较多的酚性化合物。     

圆滑番荔枝树皮中的化学成分

目的对番荔枝科植物圆滑番荔枝（Annona nctglabra Lnn．）树皮的化学成分进行分离、鉴定。方法采用硅胶柱、色谱等分离手段；利用理化性质与波谱技术对化合物进行鉴定。结果分得7个化合物，经鉴定为：ent-kauran-16α，17-diol（1），16α-H-ent-kauran-17-oic acid（2），19-hydroxy-16α-（-）-kauran-17-oic acid（3），16α-hydro-19-acetoxy-ent-kauran-17-oic acid（4），liriodenine（5），β-谷甾醇（β-sitosterol，6）和胡萝卜苷（daucosterol，7）。结论化合物2、6、7为首次从该植物中分离得到。     

马银花的化学成分研究

目的研究马银花的化学成分。方法利用硅胶色谱分离纯化马银花根的化学成分，根据化合物的理化性质和光谱数据鉴定化合物的结构。结果分离并鉴定了7个化合物，其结构分别为3，5，7-三羟基色原酮-3-O-β-D-吡喃木糖苷(I)，蒲公英赛醇(II)，β-谷甾醇(III)，白桦酸(IV)，槲皮素(V)，槲皮素-3-O-α-L-鼠李糖苷(VI)和葡萄糖(VII)。结论化合物I为新化合物，化合物II-VII为首次从该植物中分离得到。     

山芝麻中三个新三萜化合物的结构测定

从梧桐科植物山芝麻(Helicteres angustifolia L.)的根中分离出6种成分。其中3种为已知化合物β-谷甾醇(β-sitosterol),白桦脂酸(betulic acid)和齐墩果酸(oleanolic acid)。其余3种为新的三萜类化合物,命名为山芝麻酸甲酯(methyl helicterate),山芝麻宁酸甲酯(methyl helicterate)和山芝麻宁酸(helicterilic acid)。其化学结构经光谱分析和衍生物制备分别推定为Ⅰ,Ⅱ和Ⅳ。     

彭泽贝母中二萜类成分

为了研究彭泽贝母的化学成分。利用多种柱色谱方法进行分离纯化，根据光谱数据和理化性质进行结构鉴定。共分离并鉴定了6个对映-贝壳杉类二萜化合物： ent-kauran-15-en-17-ol (I)， ent--kauran-15-en-3α,17-diol (II)， 鄂贝新醇(III)， ent--kauran-16α,17-diol (IV)， ent--kauran-3α，16α,17-triol (V)， ent--16,17-epoxy-kauran-3α-ol (VI)。6个化合物均为首次从彭泽贝母中分得，其中ent--16,17-epoxy-kauran-3α-ol (VI)为新化合物。     

Chemical constituents of Nouelia insignis Franch

Two new diterpenes and ent-15alpha-hydroxykaur-16-en-19-oic acid 11,12-acetonide (3), together with 23 known compounds were isolated from the dried aerial parts of Nouelia insignis Franch. The structures of new compounds were determined to be ent-14beta,15alpha-dihydroxykaur-16-en-19-oic acid (1), ent-14beta-hydroxy-15-oxokaur-16-en-19-oic acid (2) on the basis of spectral and chemical evidence. The structure of ent-11alpha,16alpha-epoxy-15alpha-hydroxy-16S-kaur-19-oic acid (4) was confirmed by X-ray crystallographic analysis.     

Hydroxylation and glucosidation of ent-16beta-Hydroxybeyeran-19-oic acid by Bacillus megaterium and Aspergillus niger

ent-16beta-Hydroxybeyeran-19-oic acid ( 1) has potential antihypertensive activity. To obtain novel and more-effective compounds, 1 was incubated with Bacillus megaterium ATCC 14 581 and Aspergillus niger CCRC 32 720. The structures of the metabolites were determined by HR-FAB-MS, 1D- and 2D-NMR spectral data, and enzymatic hydrolysis. Bacillus megaterium hydroxylated and glucosidated 1 to yield ent-7alpha,16beta-dihydroxybeyeran-19-oic acid ( 2), ent-16beta-hydroxybeyeran-19-oic acid alpha- D-glucopyranosyl ester ( 3), and ent-7alpha,16beta-dihydroxybeyeran-19-oic acid alpha- D-glucopyranosyl ester ( 4). Aspergillus niger hydroxylated 1 to yield ent-1beta,7alpha,16beta-trihydroxybeyeran-19-oic acid ( 5) and ent-1beta,7alpha-dihydroxy-16-oxobeyeran-19-oic acid ( 6). Metabolites 3 - 5 were characterized as new compounds. In addition, 2, 3, 5, and 6 were tested for antihypertensive effects, and we found that 5 and 6 were more potent than the parent compound 1.     

Novel ent-Beyeran-19-oic acids from biotransformations of isosteviol metabolites by Mortierella isabellina

Biotransformations of ENT-16beta-hydroxybeyeran-19-oic acid ( 1) by Mortierella isabellina produced hydroxylated metabolites. The isolated metabolites included three new compounds, ent-14beta,16beta-dihydroxybeyeran-19-oic acid ( 3), ent-12beta-hydroxy-16-oxobeyeran-19-oic acid ( 4), and ent-7alpha,12beta-dihydroxy-16-oxobeyeran-19-oic acid ( 5), and one known compound, ent-7alpha,16beta-dihydroxybeyeran-19-oic acid ( 2). The structural elucidation was achieved by detailed analysis of LC-MS chromatograms, and MS and NMR spectroscopic data. In this study, M. isabellina hydroxylated the basic skeleton beyeran-19-oic acid at the 7beta-, 12alpha-, and 14alpha-positions, and oxidized the skeleton at the 16-position. All compounds were evaluated with the cell viability assay. The results of the bioassay indicated that MTT formazan exocytosis occurs upon treatment of the cells with 1.     

New macrocyclic lathyrane diterpenes, from Euphorbia lagascae, as inhibitors of multidrug resistance of tumour cells

The new macrocyclic lathyrane diterpenes latilagascenes A and B ( 1 and 2), the diacetylated derivative of 2, latilagascene C ( 3), and the known diterpenes ent-16alpha,17-dihydroxyatisan-3-one ( 4) and ent-16alpha,17-dihydroxykauran-3-one ( 5), isolated from the methanol extract of Euphorbia lagascae, were examined for their effects on the reversal of multidrug resistance (MDR) on mouse lymphoma cells. Among the active lathyrane derivatives 1 - 3, compound 2 displayed the highest inhibition of rhodamine 123 efflux of human MDR1 gene transfected mouse lymphoma cells when compared to the untreated cells or the positive control verapamil. The new compounds are the first macrocyclic lathyrane diterpenes showing oxidation at C-16, whose structures were characterized by extensive spectroscopic methods, including 2D NMR experiments ( (1)H- (1)H COSY, HMQC, HMBC and NOESY). The known phenolic compounds vanillic acid ( 6), p-salicylic acid ( 7), isofraxidin ( 8) and cleomiscosin A ( 9) were also isolated from this species.     

Constituents of the herb ofIsodon excisus var.coreanus

The studies were carried out to evaluate the constituents in the aerial part ofIsodon excisus var.coreanus (Labiatae). From the aqueous fraction of methanol extract, compound 1 (alpha-[[3-(3, 4-dihydroxyphenyl)-1-oxo-2-propenyl]oxy]-3,4-dihydroxy-benzenepropanoic acid), compound II (9-methyl-dihydroferulic acid-4-O-beta-D-glucopyranosyl (1-->2)-alpha-L- rhamnopyranosyl (1-->4)-beta-D-glucopyranoside), compound III (ent-7alpha, 11alpha, 15beta-trihydroxy-kaur-16-en-1-O-beta-D-glucopyranoside) and compound IV (2alpha, 3beta, 7alpha, 23-tetrahydroxy-olean-12-en-28-oic acid 28-O-beta-D-glucopyranoside) were isolated and identified on the basis of their physicochemical and spectroscopic evidences[IR, FAB(-)MS,(1)H-NMR,(13)C-NMR, HMQC,(1)H-(1)H COSY and HMBC (Heteronuclear Multiple Bond Connectivity)]. Especially, New compounds II and III were named isodonin A and Isodonin B respectively.     

A new <Emphasis Type="Italic">ent</Emphasis>-kaurane type diterpenoid glycoside from <Emphasis Type="Italic">Inula japonica</Emphasis> Thunb.

A new ent-kaurane type diterpenoid glycoside, 17-O-β-D-glucopyranosyl-16α-ent-kauran-19-oic acid (1), together with 17-hydroxy-16α-ent-kauran-19-oic acid (2), 16α,17-dihydroxyl-ent-kauran-19-oic acid (3), and 16α-hydroxy-17-acetoxy-ent-kauran-19-oic acid (4) were isolated from the aerial parts of Inula japonica Thunb. The structure of 1 was determined mainly by use of 1D and 2D NMR spectroscopic techniques including HSQC, ¹H-¹H COSY, HMBC, and NOESY. In addition, 4 exhibited significant inhibitory activity on NO production in LPS-stimulated RAW264.7 cells with IC₅₀ value of 14.3 μg/mL.     

Inhibitory Constituents against Cyclooxygenases fromAralia cordata Thunb

Seven diterpenes, four polyacetylenes, a lipid glycerol, and two sterols were isolated from the methylene chloride fraction of the root of Aralia cordata. Their chemical structures were determined as (-)-pimara-8(14),15-dien-19-oic acid (2), pimaric acid (3), (-)-kaur-16-en-19-oic acid (4), 17-hydroxy-ent-kaur-15-en-19-oic acid (9), 7alpha-hydroxy-(-)-pimara-8(14),15-dien-19-oic acid (10), 16alpha,17-dihydroxy-(-)-kauran-19-oic acid (11), 16-hydroxy-17-isovaleroyloxy-ent-kauran-19-oic acid (12), falcarindiol (5), dehydrofalcarindiol (6), dehydrofalcarindiol-8-acetate (7), falcarindiol-8-acetate (8), alpha-mono palmitin (13), stigmasterol (1), and daucosterol (14) by the spectral evidences. These compounds were tested with COX-1 and COX-2 inhibition assays. This study found that compounds 2, 4, 5, 6, 7, 8, and 10 inhibited COX-1 dependent conversion of the exogenous arachidonic acid to PGE2 in a dose-dependent manner with IC50 values of 134.2 microM, 121.6 microM, 170 microM, 50.4 microM, 11.7 microM, 99.6 microM, and 69.6 microM, respectively. But, most of these compounds weakly inhibited COX-2 dependent PGE2 generation. Among them, only compound 4 showed relatively significant inhibitory activity (IC50: 127.6 microM).     

ent-Kaurenoids from the roots of Cacalia pilgeriana

Two new ent-kaurenoids,19-acetoxyl-ent-3beta,17-dihydroxykaur-15-ene (1), 19-acetoxyl-ent-3beta-hydroxykaur-15-en-17-al (2), together with seven known ent-kaurenoids: ent-kaur-16-en-19-al (3), ent-kaur-16-en-19-oic acid (4), ent-kauran-16beta,17-diol (5), ent-15beta, 16beta-epoxy-17-hydroxykauran-19-oic acid (6),19-acetyl-ent-3beta-hydroxyl-kaur-16-ene (7), ent-3beta,19-dihydroxykaur-16-ene (8), ent-17-hydroxykaur-15-ene (9), were isolated from Cacalia pilgeriana. Their structures were elucidated by spectroscopic methods including 2D NMR spectral analysis.