Nine New Sesquiterpenes from Dendrobium nobile

Nine new sesquiterpenes, i.e., dendronobilins A–I ( 1 – 9 ), with copacamphane‐type ( 1 ), picrotoxane‐type ( 2 – 6 ), muurolene‐type ( 7 ), alloaromadendrane‐type ( 8 ), and cyclocopacamphane‐type ( 9 ) skeletons, were isolated from the 60% EtOH extract of the stems of Dendrobium nobile. Their structures were established as (1R,2R,4S,5S,6S,8S,9R)‐2,8‐dihydroxycopacamphan‐15‐one ( 1 ), (2β,3β,4β,5β)‐2,4,11‐trihydroxypicrotoxano‐3(15)‐lactone ( 2 ), (2β,3β,5β,9α,11β)‐2,11‐epoxy‐9,11,13‐trihydroxypicrotoxano‐3(15)‐lactone ( 3 ), (2β,3β,5β,12R*)‐2,11,13‐trihydroxypicrotoxano‐3(15)‐lactone ( 4 ), (2β,3β,5β,12S*)‐2,11,13‐trihydroxypicrotoxano‐3(15)‐lactone ( 5 ), (2β,3β,5β,9α)‐9,10‐cyclo‐2,11,13‐trihydroxypicrotoxano‐3(15)‐lactone ( 6 ), (9β,10α)‐muurol‐4‐ene‐9,10,11‐triol ( 7 ), (10α)‐alloaromadendrane‐10,12,14‐triol ( 8 ), and (5β)‐cyclocopacamphane‐5,12,15‐triol ( 9 ) on the basis of spectroscopic analysis. The absolute configuration of compound 1 was tentatively assigned as (1R,2R,4S,5S,6S,8S,9R) according to its CD spectrum and the octant rule. Compounds 1 and 4 – 9 were inactive in our preliminary in vitro immunomodulatory bioassay.     

Dendrocoumarin: a new benzocoumarin derivative from the stem of Dendrobium nobile

A new benzocoumarin derivative, dendrocoumarin (1), along with itolide A were isolated from the stems of Dendrobium nobile. The structure of the new compound 1 elucidated on the basis of NMR and mass spectroscopic data. Compounds 1 and 2 showed broad spectrum antibacterial activity against five terrestrial pathogenic bacteria.     

A New Picrotoxane Type Sesquiterpene from Dendrobium densiflorum

A new picrotoxane type sesquiterpene named dendrodensiflorol has been isolated from the stems of Dendrobium densiflorum. Its structure was identified on the basis of spectroscopic method.     

金钗石斛免疫活性多糖DNP-W1B的结构特征

从金钗石斛茎中获得了1个均一多糖组分DNP-W1B, 采用化学与光谱学结合的手段对其一级结构进行了解析. 结果表明, DNP-W1B分子量为7.7×10⁵, 比旋度²⁰_D=+81.3°(c0.3, H₂O), 由葡萄糖、 阿拉伯糖和半乳糖3种单糖组成, 摩尔比为6.2:3.1:0.9. DNP-W1B主链由1,4-和1,6-连接的葡萄糖残基组成, 在主链1,6-连接葡萄糖残基的4位形成分支, 支链由末端半乳糖残基和阿拉伯糖残基组成. 初步的免疫活性实验结果表明, DNP-W1B在体外能促进免疫细胞的增殖.     

Novel Bis(bibenzyl) and (Propylphenyl)bibenzyl Derivatives from Dendrobium nobile

Two novel compounds possessing a bis(bibenzyl) (see 1 ) and a (propylphenyl)bibenzyl skeleton (see 2 ) and eight known compounds were isolated from the stems of Dendrobium nobile Lindl . (Orchidaceae). Their structures were identified by spectroscopic analyses.     

A New Bibenzyl Glycoside from Dendrobium moniliforme

A new bibenzyl glycoside has been isolated from the stems of Dendrobium moniliforme (L.) Sw.(Orchidaceas).Its structure has been identified on the basis of spectroscopic and chemical methods.     

New Bibenzyl and Phenanthrenedione from Dendrobium densiflorum

Several species of Dendrobium plants (Orchidaceae) are used in traditional Chinesemedicine as a Yin tonic to nourish the stomach, promote the production of body fluid,and reduce feverl. Chemical components of several Dendrobium plants have been widelyinvestigated" 3. D. densytorum Lindl. ex Wall. is one species of Dendrobium plants,several components of this species have been reported before" 5. We herein reportstructural elucidation of a new bibenzyl named densiflorol A 1 and a newphenant…     

A new (propylphenyl)bibenzyl derivative from Dendrobium williamsonii

A new (propylphenyl)bibenzyl derivative, dendrowillol A (1), along with 22 known compounds were isolated from the whole plants of Dendrobium williamsonii. Their structures were elucidated by means of extensive spectroscopic analysis. Cytotoxicity evaluation against five human tumour lines showed that all the compounds tested displayed very weak cytotoxicity when compared with the positive control taxol, but selective inhibitory effects on HL-60 for several compounds tested were observed, with IC₅₀ values ranging from 4.48 to 11.04 μM.     

A New Bibenzyl Derivative from Dendrobium moniliforme

A new bibenzyl derivative,3,4-dihydroxy-4′,5-dimethoxy bibenzyl,was isolated from a orchid Dendrobium moniliforme. The structure elucidation and ^1H,^13C NMR assignments were achieved by spectroscopic method.     

A new 9,10-dihydrophenanthrene from Dendrobium moniliforme

A new 9,10-dihydrophenanthrene,1,5-dihydroxy-3,4,7-trimethoxy-9,10-dihydrophenanthrene (1) was isolated and identified from the whole plants of Dendrobium moniliforme, as well as 24 known compounds including hircinol (2), (2R^*,3S^*)-3-hydroxymethyl-9-methoxy-2-(4′-hydroxy-3′,5′-dimethoxyphenyl)-2,3,6,7-tetrahydro-phenanthro[4,3-b]furan-5,11-diol (3), diospyrosin (4), aloifol I (5), moscatilin (6), 3,4′-dihydroxy-3′,4,5-trimethoxybibenzyl (7), gigantol (8), 3,3′-dihydroxy-4,5-dimethoxybibenzyl (9), longicornuol A (10), N-trans-cinnamoyltyramine (11), paprazine (12), N-trans-feruloyl 3′-O-methyldopamine (13), moupinamide (14), dihydroconiferyl dihydro-p-coumarate (15), dihydrosinapyl dihydro-p-coumarate (16), 3-isopropyl-5-acetoxycyclohexene-2-one-1 (17), p-hydroxybenzaldehyde (18), vanillin (19), p-hydroxyphenylpropionic acid (20), vanillic acid (21), protocatechuic acid (22), (+)-syringaresinol (23), β-sitosterol (24) and daucosterol (25). Compounds 3, 4, 13, 16, 17 and 20 were isolated from the Dendrobium genus for the first time, and compounds 2, 5, 7, 9–12, 14, 15, 18, 21 and 22 were originally obtained from D. moniliforme.     

金钗石斛化学成分研究

金钗石斛(Dendrobium nobile Lindl.)系兰科石斛属草本植物,具有滋阴清热、生津益胃、润肺止咳的功效,是中药石斛的主要来源之一.对金钗石斛的化学成分进行了研究,利用多种色谱技术分离得到了4个化合物,并采用现代波谱技术,尤其是超导核磁共振技术(NMR)和文献数据对照鉴定他们的结构分别为:dengibsin(1)、2,4,7-三羟基-5-甲基芴酮(2)、大黄酚(3)、β-谷甾醇(4).这4个化合物为首次从该植物中获得.     

A New Nitro Alkaloid from Corydalis saxicola Bunting

A new nitro tetrahydronprotoberberins alkaloid, 1-nitro-apocavidine was isolated from Corydalis saxicola Bunting. The structure was established by spectroscopic methods.     

A New Indole Alkaloid from Limonia Crenulata

Limonia crenulata Roxb. (Rutaceae), a small tree widely distributed in dry warm regions of southeastern Asia, has been reported to have antiepileptic, purgative and sudorific effects and is used for colic trouble and cardialgia1. Various parts of this plant have been employed in indigenous medicine. Our investigation on its stems led to the isolation of one new alkaloid, crenulatine 1, together with three known ones, 4-methoxy-6- hydroxy-1-methyl-2-quinolone2, N-benzoyltyramine methyl ether2,…     

Peduncin, A New Indole Alkaloid from Pueraria peduncualris

Pueraria peduncularis (Grah. ex Benth.) Benth. is a plant of Leguminosae which grows in the southwest of China. Different from other plants of Pueraria, it could not be used as a medicine due to its toxicity1. In order to use the Pueraria plants safer, we studied the constituents of P. peduncularis. Previous phytochemical studies of an n-BuOH extract afforded three triterpenoid saponins2-3. The continuing investigation on CHCl3 extract led to the isolation of a new indole alkaloid. …     

A New Binary Carbazole Alkaloid from Murraya koenigii

A new binary carbazole alkaloid,8,8″-biskoenigine (1), along with its monomer, koenigine,was isolated from the dried leaves of Murraya koenigii collected in Xishuangbanna, Yunnan province. The structure of 1 was established spectroscopic methods.     

藏药蓝翠雀花中的新二萜生物碱

蓝翠雀花(Delphinium caeruleum Jacq.ex Camb.)~[1]在甘肃西南部、西藏、青海等地分布较广,藏民常用其治疗牙痛、跌打损伤.其化学成分迄今未见报道.我们将其全草用乙醇浸泡,石油醚脱脂,乙醚除去色素,酸碱常法处理,氯仿萃取得总生物碱.用氧化铝、硅胶进行多次柱层析及硅胶薄层制备层析,分得碱(1)～(4).     

金钗石斛精油化学成份研究

金钗石斛(Dendrobium nobile Lindl.)是中药石斛的品种之一,目前有以鲜金钗石斛水蒸气蒸馏液制成的制剂(如鲜石斛露)供药用,具有滋阴养胃,清热解酒,润肺止咳,生津止渴之功效。经我们药理实验证明,金钗石斛水蒸气蒸馏液对豚鼠离体肠管活动有兴奋作用,对大肠杆菌、枯草杆菌、金黄色葡萄球菌有抑制作用,但其精油成分的研究未见文献报道。我们采用 GC—MS—DS 技术对金钗石斛鲜茎水蒸气蒸馏精油成分进行了研究,发现其主要成份为泪柏醇,另外还有紫罗兰酮等53个成份。     

A New Benzylisoquinoline Alkaloid from Sabia parviflora

A new benzylisoquinoline alkaloid,1,2,3,4-tetrahydro-5-hydroxyl-8-methoxyl-2-methyl-4′-methoxyl-benzylisoquinoline,was isolated from the arial parts of Sabia parviflora. Its structure was established on the basis of spectral analysis.     

A New Alkaloid from Sinomenium acutum

Sinomenium acutum is widely used in East and South Asia for the treatment of many diseases, especially rheumatoid arthritis （RA）. The chemical research on Sinomenium acutum led to the isolation of a new alkaloid compound （1）. On the basis of chemical evidences and spectral analysis, 1 was identified as N-（1, 7-dimethoxylphenanthren-2-yl）acetamide.