素馨花三萜皂苷类化学成分研究

目的:研究木犀科茉莉属植物素馨花干燥花蕾的化学成分。方法:通过硅胶柱色谱、Sephadex LH-20柱色谱和重结晶等方法进行分离纯化,根据化合物的理化性质和波谱数据鉴定结构。结果:从素馨花干燥花蕾70%乙醇提取物中分离得到6个三萜皂苷类化合物,分别鉴定为3-O-α-L-吡喃鼠李糖基(1→2)-β-D-吡喃木糖基常春藤皂苷元-28-O-β-D-吡喃半乳糖基(1→6)-β-D-吡喃半乳糖酯苷(1)、常春藤皂苷元3-O-β-D-吡喃葡萄糖基(1→3)-α-L-吡喃阿拉伯糖苷(2)、2α,3β,23-trihydroxyolean-12-en-28-oic-O-β-D-glucopyranosyl ester(3)、常春藤皂昔元-3-O-β-D-吡喃木糖基(1→3)-α-L-吡喃鼠李糖基(1→2)-α-L-吡喃阿拉伯糖苷(4)、2α,3β,23-trihydroxyolean-12-en-28-oic-O-α-L-rhamnopyranosyl(1→4)-O-β-D-glucopyranosyl(1→6)-β-D-glucopyranosyl ester(5)、常春藤皂苷元-3-O-α-L-吡喃鼠李糖基(1→)2-α-L-吡喃阿拉伯糖苷(6)。结论:化合物1为新化合物,化合物26为首次从茉莉属植物中分离得到。     

过山蕨中黄酮类成分的研究

 目的研究过山蕨(Camptosorus sibiricus Rupr.)中黄酮类化学成分。方法采用反复硅胶柱色谱法、Sephadex LH-20柱色谱法、高效液相色谱法等进行分离纯化,并通过理化常数测定和光谱分析鉴定了其化学结构。结果从过山蕨70%乙醇提取物中分离得到6个黄酮类化合物,并鉴定其结构为:山柰酚(1);山柰酚-7-O-α-L-鼠李糖苷(2);山柰酚-3-O-β-D-吡喃葡萄糖基(1→2)-β-D-吡喃葡萄糖苷(3);山柰酚-3-O-β-D-吡喃葡萄糖基(1→2)-β-D-吡喃葡萄糖基-7-O-β-D-吡喃葡萄糖苷(4);山柰酚-3-O-β-D-吡喃葡萄糖基-7-O-β-D-吡喃葡萄糖基(1→2)-β-D-吡喃葡萄糖苷(5);山柰酚-3-O-β-D-吡喃葡萄糖基(1→4)-α-L-鼠李糖基-7-O-α-L-鼠李糖苷(6)。结论化合物2,3,4,5,6均为首次从该属植物中分离得到。     

黑刺菝葜茎的化学成分研究

 目的研究黑刺菝葜茎的化学成分,为充分利用黑刺菝葜药用植物资源鉴定基础。方法利用大孔树脂、硅胶和Sephadex LH-20等色谱分离手段进行分离纯化,通过理化性质和光谱分析鉴定结构。结果从黑刺菝葜茎乙醇提取物的乙酸乙酯、正丁醇萃取物分离鉴定了5个化合物,分别为反式白藜芦醇(1)、槲皮素-3-O-β-D-葡萄糖苷(2)、木犀草素-7-O-β-D-葡萄糖苷(3)、拉克索皂苷元-3-O-[α-L-吡喃阿拉伯糖基-(1→6)]-β-D-吡喃葡萄糖苷(4)、拉克索皂苷元-3-O-[β-D-吡喃葡萄糖基-(1→4)][α-L-吡喃阿拉伯糖基-(1→6)]-β-D-吡喃葡萄糖苷(5)。结论化合物1～3首次从本植物中分离得到。     

穿山龙中甾体皂苷的分离鉴定

 目的分离、鉴定穿山龙即穿龙薯蓣(Dioscorea nipponica Makino)根茎中的甾体皂苷类化合物。方法采用溶剂提取、硅胶柱色谱及制备高效液相色谱等方法进行分离,通过化学和光谱学方法鉴定化合物的结构。结果分离得到4种甾体皂苷类化合物,其化学结构分别鉴定为:薯蓣皂苷(Ⅰ),纤细薯蓣皂苷(Ⅱ),26-O-β-D-吡喃葡萄糖基25(R)-22-羟基-呋甾-△⁵⁽⁶⁾-烯- 3β,26-二羟基-3-O-{[α-L-吡喃鼠李糖基(1→2)]-α-L-吡喃鼠李糖基(1→4)}-β-D-吡喃葡萄糖苷(Ⅲ),26-O-β-D-吡喃葡萄糖基25(R)-22-羟基-呋甾-△⁵⁽⁶⁾-烯-3β,26-二羟基-3-O-{[α-L-吡喃鼠李糖基(1→2)]-β-D-吡喃葡萄糖基(1→3)}-β-D-吡喃葡萄糖苷(Ⅳ)。结论化合物Ⅲ,Ⅳ为首次从穿龙薯蓣中分离得到的呋喃甾烷型皂苷。     

蒙药玉簪花中的甾体化合物

 目的 研究玉簪［Hosta plantaginea （Lam.）Aschers］花的化学成分。方法 利用溶剂法进行提取和萃取分部,采用硅胶柱色谱、Sephadex LH-20柱色谱进行分离,利用理化鉴别及现代波谱分析技术鉴定化合物的结构。结果 从中分离鉴定了6个甾体化合物,分别为(25R)-5α-螺旋甾烷-2α,3β-二醇（支脱皂苷元）（1）, (25R)- 2α,3β-二醇-5α-螺旋甾烷-12-酮（曼诺皂苷元）（2）,胡萝卜苷（3）,支脱皂苷元-3-O-{O-β-D-吡喃葡萄糖基(1→2)-O-β-D-吡喃葡萄糖基-(1→4)-β-D-吡喃半乳糖苷}（4）,支脱皂苷元-3-O-{O-β-D-吡喃葡萄糖基(1→2)-O-［β-D-吡喃木糖基(1→3)］-O-β-D-吡喃葡萄糖基-(1→4)-β-D-吡喃半乳糖苷}（5）和支脱皂苷元-3-O-{O-β-D-吡喃葡萄糖基-(1→2)-O-［O-α-L-呋喃鼠李糖基-(1→4)-β-D-吡喃木糖基(1→3)］-O-β-D-吡喃葡萄糖-(1→4)-β-D-吡喃半乳糖苷}（6）。结论 6个化合物均为首次从该植物中得到。
     

卷丹化学成分研究

目的：研究卷丹Lilium lancifolium鳞茎中的化学成分。方法：用色谱法分离卷丹的化学成分,用波谱法鉴定其结构。结果：从卷丹中分离并鉴定了10个化合物,分别为王百合苷A(1),王百合苷C(2),甲基-α-D-吡喃甘露糖苷(3),甲基-α-D-吡喃葡萄糖苷(4),(25R,26R)-26-甲氧基螺甾烷-5-烯-3β-O-α-L-吡喃鼠李糖-(1→2)-［β-D-吡喃葡萄糖-(1→6)］-β-D-吡喃葡萄糖苷(5),(25R)-螺甾烷-5-烯-3β-O-α-L-吡喃鼠李糖-(1→2)-［β-D-吡喃葡萄糖-(1→6)］-β-D-吡喃葡萄糖苷(6),(25R,26R)-17α-羟基-26-甲氧基螺甾烷-5-烯-3β-O-α-L-吡喃鼠李糖-(1→2)-［β-D-吡喃葡萄糖-(1→6)］-β-D-吡喃葡萄糖苷(7),胡萝卜苷(8),腺嘌呤核苷(9),小檗碱(10)。结论：除化合物1,3外均为首次从该植物中分离得到,其中10为首次从百合属植物中发现。     

预知子化学成分研究

 目的研究预知子的化学成分。方法通过反复硅胶柱色谱、ODS柱色谱和重结晶的方法分离纯化,根据化合物的理化性质和波谱数据鉴定结构。结果分离得到7个化合物,分别为常春藤皂苷元-3-O-α-L-吡喃鼠李糖基(1→2)-α-L-吡喃阿拉伯糖苷(Ⅰ),常春藤皂苷元-3-O-α-L-吡喃阿拉伯糖苷(Ⅱ),3-O-α-L-吡喃鼠李糖-(1→2)-α-L-吡喃阿拉伯糖-常春藤皂苷元-28-O-α-L-吡喃鼠李糖-(1→4)-β-D-吡喃葡萄糖-(1→6)-β-D-吡喃葡萄糖苷(Ⅲ),3-O-α-L-吡喃阿拉伯糖-常春藤皂苷元-28-O-β-D-吡喃葡萄糖-(1→6)-β-D-吡喃葡萄糖苷(Ⅳ),常春藤皂苷元-28-O-β-D-吡喃葡萄糖-(1→6)-β-D-吡喃葡萄糖苷(Ⅴ),3-O-β-D-吡喃葡萄糖-(1→2)-α-L-吡喃阿拉伯糖-30-去甲齐墩果酸-28-O-α-L-吡喃鼠李糖-(1→4)-β-D-吡喃葡萄糖-(1→6)-β-D-吡喃葡萄糖苷(Ⅵ),胡萝卜苷(Ⅶ)。结论其中化合物Ⅱ、Ⅲ、Ⅳ为首次从本植物中分离得到,化合物Ⅴ、Ⅵ为首次从本属植物中分离得到。     

乌骨藤总苷H的化学成分研究

 目的 研究乌骨藤总苷H的化学成分。方法 采用柱色谱和HPLC技术对乌骨藤总苷H中的化学成分进行分离纯化,并通过理化性质和波谱方法鉴定其结构。结果 从骨藤总苷H中分离得到6个化合物,分别鉴定为tenacissoside A(1、tenacissoside B(2、tenacissoside C(3、tenacissoside D(4、marsdenoside K(5、11-α-O-乙酰基-12-β-O-惕各酰基tenacigenin B 3-O-β-D-葡萄吡喃糖基-(1→4-6-去氧-3-O-甲基-β-D-阿洛吡喃糖基-(1→4-β-D-夹竹桃吡喃糖苷(6。结论 化合物6是新化合物,为首次从该属植物中分离得到。     

大叶冬青的三萜皂苷类成分研究

 目的 对中药苦丁茶主要品种大叶冬青叶的三萜皂苷类成分进行研究。方法 采用硅胶、葡聚糖凝胶LH-20和反相ODS柱色谱分离大叶冬青叶的水提物,通过光谱分析结合理化性质鉴定化合物的结构。结果 从大叶冬青的水提液中分离得到11个化合物,分别鉴定为α-苦丁内酯3-O-β-D-吡喃葡萄糖(1→3)[α-L-吡喃鼠李糖(1→2)]-α-L-吡喃阿拉伯糖苷(Ⅰ)、α-苦丁内酯3-O-β-D吡喃葡萄糖 (1→2)-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖苷 (Ⅱ)、3-O-β-D-吡喃葡萄糖 (1→2)-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖斯阿树脂酸28-α-L-吡喃鼠李糖 (1→2)-β-D-吡喃葡萄糖酯苷(Ⅲ)、3-O-β-D-吡喃葡萄糖(1→2)-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖坡模醇酸28-α-L-吡喃鼠李糖 (1→2)-β-D-吡喃葡萄糖酯苷 (Ⅳ)、β-苦丁内酯3-O-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖苷(Ⅴ)、β-苦丁内酯3-O-β-D-吡喃葡萄糖 (1→2)-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖苷(Ⅵ)、γ-苦丁内酯3-O-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖苷(Ⅶ)、3-O-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖齐墩果酸28-α-L-吡喃鼠李糖 (1→2)-β-D-吡喃葡萄糖酯苷(Ⅷ)、3-O-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖斯阿树脂酸28-α-L-吡喃鼠李糖 (1→2)-β-D-吡喃葡萄糖酯苷(Ⅸ)、3-O-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖-(1→2)]-α-L-吡喃阿拉伯糖坡模醇酸28-α-L-吡喃鼠李糖 (1→2)- β-D-吡喃葡萄糖酯苷(Ⅹ)及δ-苦丁内酯3-O-β-D-吡喃葡萄糖 (1→2)-β-D-吡喃葡萄糖 (1→3)-[α-L-吡喃鼠李糖 (1→2)]-α-L-吡喃阿拉伯糖苷(Ⅺ)。结论 化合物Ⅰ～Ⅳ、Ⅵ、Ⅶ及Ⅺ为首次从该植物中分离得到。     

滇重楼的抗肿瘤活性成分研究

目的：研究滇重楼Paris polyphylla Smith var. yunnanensis根茎中具有抗肿瘤作用的活性成分。方法：利用硅胶柱色谱,Sephadex LH-20,反相制备HPLC等手段进行分离纯化,并通过波谱技术进行结构鉴定。采用MTT法对分离到的化合物进行抗肿瘤活性筛选。结果：从醋酸乙酯和正丁醇层中分离得到了6个化合物,鉴定为薯蓣皂苷元-3-O-α-L-呋喃阿拉伯糖基(1→4)-β-D-葡萄糖苷(1)、偏诺皂苷元-3-O-α-L-呋喃阿拉伯糖基(1→4)-β-D-葡萄糖苷(2)、异鼠李素-3-O-β-D-葡萄糖苷(3)、乙基-α-D-呋喃果糖苷(4)、偏诺皂苷元-3-O-α-L-吡喃鼠李糖基(1→4)-［α-L-吡喃鼠李糖基(1→2)］-β-D-葡萄糖苷(5)、偏诺皂苷元-3-O-α-L-吡喃鼠李糖基(1→4)-α-L-吡喃鼠李糖基(1→4)-［α-L-吡喃鼠李糖基(1→2)］-β-D-葡萄糖苷(6)。结论：化合物1～4为首次从滇重楼中分离得到,化合物3和4为首次从重楼属植物中分离得到,化合物5为首次从滇重楼的根茎中分离得到。药理实验表明,化合物1～3,5和6对小鼠肺腺癌细胞LA795都显示出一定的抑制作用,其中化合物5和6最显著。     

Kinmoonosides A-C, three new cytotoxic saponins from the fruits of Acacia concinna, a medicinal plant collected in myanmar

Three genuine saponins, named kinmoonosides A-C (1-3), have been isolated, together with a new monoterpenoid (4), from a methanolic extract of the fruits of Acacia concinna. The structures of kinmoonosides A-C were elucidated on the basis of spectral analysis as 3-O-?alpha-L-arabinopyranosyl(1-->6)-[beta-D-glucopyranosyl(1-->2) ]-b eta-D-glucopyranosyl?-21-O-?(6R, 2E)-2-hydroxymethyl-6-methyl-6-O-[4-O-(2'E)-6'-hydroxyl-2'-hydroxymet hyl-6'-methyl-2',7'-octadienoyl-beta-D-quinovopyranosyl]-2, 7-octadienoyl?acacic acid 28-O-alpha-L-arabinofuranosyl(1-->4)-[beta-D-glucopyranosyl(1-->3)]-a lpha-L-rhamnopyranosyl(1-->2)-beta-D-glucopyranosyl ester (1); 3-O-?alpha-L-arabinopyranosyl(1-->6)-[beta-D-glucopyranosyl(1-->2) ]-b eta-D-glucopyranosyl?-21-O-?(6S, 2E)-2-hydroxymethyl-6-methyl-6-O-[4-O-(2'E)-6'-hydroxyl-2'-hydroxymet hyl-6'-methyl-2',7'-octadienoyl-beta-D-quinobopyranosyl]-2, 7-octadienoyl?acacic acid 28-O-alpha-L-arabinofuranosyl(1-->4)-[beta-D-glucopyranosyl(1-->3)]-a lpha-L-rhamnopyranosyl(1-->2)-beta-D-glucopyranosyl ester (2); and 3-O-?alpha-L-arabinopyranosyl(1-->6)-[beta-D-glucopyranosyl(1-->2) ]-b eta-D-glucopyranosyl?-21-O-[(2E)-6-hydroxyl-2-hydroxymethyl-6-methyl- 2,7-octadienoyl]acacic acid 28-O-alpha-L-arabinofuranosyl(1-->4)-[beta-D-glucopyranosyl(1-->3)]-a lpha-L-rhamnopyranosyl(1-->2)-beta-D-glucopyranosyl ester (3), respectively. The new monoterpenoid 4 was determined as 4-O-[(2E)-6-hydroxyl-2-hydroxymethyl-6-methyl-2, 7-octadienoyl]-D-quinovopyranose. Compounds 1-3 showed significant cytotoxicity against human HT-1080 fibrosarcoma cells.     

土贝母中一个新的三萜皂苷

目的对土贝母Bolbostemma paniculatum的三萜皂苷成分进行分离和结构鉴定。方法采用反复柱色谱方法进行分离,通过理化性质和波谱分析鉴定结构。结果从土贝母中分离并鉴定了1个新的三萜皂苷脱木糖土贝母苷丙(dexylosyltubeimoside Ⅲ)。结论化合物为新化合物。     

无梗五加果实中齐墩果酸苷的分离与鉴定

目的:研究无梗五加Acanthopanax sessiliflorus( Ruqr.et Maxim) Seem.果实的化学成分.方法:采用溶剂提取法、溶剂萃取法、硅胶柱色谱法、凝胶柱色谱法、重结晶法对无梗五加果实中的化合物进行分离纯化;根据光谱数据和理化性质确定化合物结构.结果:分离并鉴定了6个化合物,分别为齐墩果酸-3-O-β-D-葡萄醛酸甲酯苷(1),齐墩果酸-3 -O-α-L-阿拉伯糖苷(2),齐墩果酸-3-O-β-D-葡萄醛酸正丁酯苷(3),齐墩果酸-3-O-β-D-葡萄糖醛酸苷(4),齐墩果酸(5),3-0-[(α-L-arabinopyranosyl) -( 1→2)] -[ -β-D-glucuronopyranosyl-6-O-methyl ester] -olean-12-ene-28-olic acid(6).结论:化合物2,3为首次从无梗五加果实中分离得到.     

Phytochemical investigation of Turnera diffusa

A phytochemical investigation of Turnera diffusa afforded 35 compounds, comprised of flavonoids, terpenoids, saccharides, phenolics, and cyanogenic derivatives, including five new compounds (1-5) and a new natural product (6). These compounds were characterized as luteolin 8-C-E-propenoic acid (1), luteolin 8-C-beta-[6-deoxy-2-O-(alpha-l-rhamnopyranosyl)-xylo-hexopyranos-3-uloside] (2), apigenin 7-O-(6' '-O-p-Z-coumaroyl-beta-d-glucopyranoside) (3), apigenin 7-O-(4' '-O-p-Z-coumaroylglucoside) (4), syringetin 3-O-[beta-d-glucopyranosyl-(1-->6)-beta-d-glucopyranoside] (5), and laricitin 3-O-[beta-d-glucopyranosyl-(1-->6)-beta-d-glucopyranoside] (6). Their structures were determined by spectroscopic and chemical methods.     

Cytotoxic furostanol saponins and a megastigmane glucoside from tribulus parvispinus

Two new furostanol saponins, (25R)-26-O-beta-D-glucopyranosyl-5alpha-furostan-2alpha,3beta,22alpha,26-tetraol 3-O-{beta-D-galactopyranosyl-(1-->2)-O-[beta-D-xylopyranosyl-(1-->3)]-O-beta-D-glucopyranosyl-(1-->4)-beta-D-galactopyranoside} (1) and (25R)-26-O-beta-D-glucopyranosyl-5alpha-furostan-3beta,22alpha,26-triol 3-O-{beta-D-galactopyranosyl-(1-->2)-O-[beta-D-xylopyranosyl-(1-->3)]-O-beta-D-glucopyranosyl-(1-->4)-beta-D-galactopyranoside} (2), and their O-methyl derivatives (3 and 4), and a new megastigmane glucoside, (6S,7E,9xi)-6,9,10-trihydroxy-4,7-megastigmadien-3-one 10-O-beta-D-glucopyranoside (6), along with one known spirostanol saponin, gitonin (5), and four known megastigmane glucosides were isolated from the aerial parts of Tribulus parvispinus. Their structures were established by detailed spectroscopic analysis. The cytotoxic activities of 1-6 against U937, MCF7, and HepG2 cells were evaluated. Compounds 2 (IC(50) 0.5 microM) and 5 (IC(50) 0.1 microM) showed the highest activity against U937 cells.     

Constituents of the Vietnamese medicinal plant Streptocaulon juventas and their antiproliferative activity against the human HT-1080 fibrosarcoma cell line

The methanolic extract of roots of Streptocaulon juventas, having shown strong antiproliferative activity against the highly metastatic human HT-1080 fibrosarcoma cell line, was subjected to activity-guided isolation to yield 16 cardenolides including five new ones, acovenosigenin A 3-O-beta-digitoxopyranoside (1), digitoxigenin gentiobioside (2), digitoxigenin 3-O-[O-beta-glucopyranosyl-(1-->6)-O-beta-glucopyranosyl-(1-->4)-3-O-acetyl-beta-digitoxopyranoside] (3), digitoxigenin 3-O-[O-beta-glucopyranosyl-(1-->6)-O-beta-glucopyranosyl-(1-->4)-O-beta-digitalopyranosyl-(1-->4)-beta-cymaropyranoside] (4), and periplogenin 3-O-(4-O-beta-glucopyranosyl-beta-digitalopyranoside) (5), and two new hemiterpenoids, (4R)-4-hydroxy-3-isopropylpentyl beta-rutinoside (6) and (R)-2-ethyl-3-methylbutyl beta-rutinoside (7), together with two known phenylpropanoids and a known phenylethanoid. The isolated cardenolides strongly inhibited the proliferation of the HT-1080 cell line (IC(50) values, 54-1600 nM).     

Two major saponins from seeds of Barringtonia asiatica: putative antifeedants toward Epilachna sp. larvae

Two major saponins have been isolated from a methanol extract of the seeds of Barringtonia asiatica, and their structures elucidated (mainly by two-dimensional NMR spectroscopy) as 3-O-[[beta-D-galactopyranosyl(1-->3)-beta-D-glucopyranosyl(1-->2)]-beta-D-glucuronopyranosyloxy]-22-O-(2-methylbutyroyloxy)-15,16,28-trihydroxy-(3beta,15alpha,16alpha,22alpha)-olean-12-ene (3) and 3-O-[[beta-D-galactopyranosyl(1-->3)-beta-D-glucopyranosyl(1-->2)]-beta-D-glucuronopyranosyloxy]-22-O-[2(E)-methyl-2-butenyloyloxy]-15,16,28-trihydroxy-(3beta,15alpha,16alpha,22alpha)-olean-12-ene (4). The antifeedant properties of 3 and 4 toward Epilachna larvae are discussed.     

Tetranorclerodanes and clerodane-type diterpene glycosides from Dicranopteris dichotoma

The acetone extract of Dicranopteris dichotoma afforded two new tetranorclerodanes, 18-hydroxyaylthonic acid (1) and 18-oxo-aylthonic acid (2), and four new clerodane-type diterpene glycosides, (6S,13S)-6-O-[6-O-acetyl-beta-d-glucopyranosyl-(1-->4)-alpha-l-rhamnopyranosyl]cleroda-3,14-dien-13-ol (3), (6S,13S)-6-O-[4-O-acetyl-beta-d-glucopyranosyl-(1-->4)-alpha-l-rhamnopyranosyl]cleroda-3,14-dien-13-ol (4), 6-O-[6-O-acetyl-beta-d-glucopyranos-yl-(1-->4)-alpha-l-rhamnopyranosyl]-(13E)-cleroda-3,13-dien-15-ol (5), and 6-O-[beta-d-glucopyranosyl]-(1-->4)-alpha-l-rhamnopyranosyl-(13E)-cleroda-3,13-dien-15-ol (6), together with two known compounds, aylthonic acid (7) and (6S,13S)-cleroda-3,14-diene-6,13-diol (8). The structures of these new compounds were established by a combination of 1D and 2D NMR techniques, MS, and acid hydrolysis. Compound 8 showed modest anti-HIV-1 activity.     

A new triterpene saponin from Pittosporum viridiflorum from the Madagascar rainforest.

A novel triterpenoid saponin, pittoviridoside (1), which possesses an unusual 2,3,4-trisubstituted glycosidic linkage, has been isolated from Pittosporum viridiflorum using the engineered yeast strains 1138, 1140, 1353, and Sc-7 for bioactivity-guided fractionation. The structure of this compound was determined to be 3-O-[beta-D-glucopyranosyl(1-->2)]-[alpha-D-arabinopyranosyl(1-->3)],[alpha-l-arabinofuranosyl(1-->4)-beta-D-glucuronopyranosyl-21-angeloyl-22-senecioylolean-12-en-3beta,15alpha,16alpha,21beta,22alpha,28-hexol by spectral, chemical, and GC analyses. This compound showed weak cytotoxicity against the A2780 human ovarian cancer cell line.     

New triterpene glycosides from the stems of Anomospermum grandifolium

Two new dammarane saponins identified as jujubogenin 3-O-alpha-l-arabinofuranosyl(1-->2)-[beta-d-glucopyranosyl(1-->6) beta-d-glucopyranosyl(1-->3)]-alpha-l-arabinopyranoside (2) and jujubogenin 3-O-alpha-l-arabinofuranosyl(1-->2)-[6-O-[3-hydroxy-3-methylglutaryl]-beta-d-glucopyranosyl(1-->3)]-alpha-l-arabinopyranoside (3) and a new lupane saponin, 3beta-hydroxylup-20(29)-en-27,28-dioic acid 28-O-beta-d-glucopyranosyl(1-->2)-[beta-d-xylopyranosyl(1-->3)]-beta-d-xylopyranosyl(1-->2)-beta-d-glucopyranoside ester (5), along with the known jujubogenin 3-O-alpha-l-arabinofuranosyl(1-->2)-[beta-d-glucopyranosyl(1-->3)]-alpha-l-arabinopyranoside (1) and 3beta-hydroxylup-20(29)-ene-27,28-dioic acid (4), were isolated from the methanol extract of the stems of Anomospermum grandifolium. The structures of the new compounds were established by spectral analysis. Antimicrobial activity screening of compounds 1-3 revealed antifungal properties against C. albicans ATCC 3153 for compounds 2 and 3. The antibacterial and antifungal activities of the petroleum ether, chloroform, and methanol extracts of A. grandifolium stems were also evaluated.