共查询到20条相似文献,搜索用时 15 毫秒
1.
Devkota KP Lenta BN Wansi JD Choudhary MI Kisangau DP Naz Q Samreen Sewald N 《Journal of natural products》2008,71(8):1481-1484
The bioassay-guided phytochemical investigation of Sarcococca hookeriana with respect to cholinesterase inhibitory properties has yielded two new 5alpha-pregnane-type steroidal alkaloids, hookerianamides J (1) and K (2), along with eight known compounds (3-10). The structures of 1 and 2 were elucidated by spectroscopic methods. These compounds displayed good to moderate activities in vitro against the enzymes acetylcholinesterase (IC 50 8.1-48.5 microM) and butyrylcholinesterase (IC 50 0.4-4.0 microM). Compounds 1-10 were also tested in vitro for their leishmanicidal activity against Leishmania major and for their antibacterial activities against Bacillus subtilis, Micrococcus luteus, Streptococcus faecalis, and Pseudomonas pallida. 相似文献
2.
Four new steroidal alkaloids, plakinamine I-K (1-3) and dihydroplakinamine K (4), were isolated from the marine sponge Corticium niger. The structures of these compounds were elucidated by interpretation of spectroscopic data. Compounds 1-4 exhibit significant in vitro cytotoxicity. 相似文献
3.
Phi TD Pham VC Thi Mai HD Litaudon M Guéritte F Nguyen VH Chau VM 《Journal of natural products》2011,74(5):1236-1240
Four new steroids, 3-epi-gitingensine (1), N-acetylgitingensine (6), kibalaurifoline (7) and kibalaurifenone (8), along with the known paravallarine (2), 7α-hydroxyparavallarine (3), gitingensine (4), and N-methylgitingensine (5) were isolated from the leaves of Kibatalia laurifolia. Their structures were determined primarily from mass spectrometry and 2D NMR analyses. On the basis of the known absolute configurations of 2 and 4, the absolute configurations of the new compounds were proposed. Due to the structural relationships of compounds 1-8, a biosynthetic pathway was suggested. Compound 2 was cytotoxic to KB cells (IC50 12.8 μM), followed by 1 with IC50 21.2 μM. 相似文献
4.
Two new steroidal alkaloids from Fritillaria ussuriensis 总被引:1,自引:0,他引:1
D M Xu M L Xu S Q Wang E X Hung X G Wen S Arihara N Shoji 《Journal of natural products》1990,53(3):549-552
5.
Two new steroidal alkaloids, along with a previously reported one of the plakinamine class, were isolated from the sponge Corticium sp. collected from Guam. The structures of the new compounds were determined by combined spectroscopic methods. These compounds exhibited moderate cytotoxicity and antifungal activity as well as DNA- and RNA-cleaving activities. 相似文献
6.
Torres MC das Chagas L Pinto F Braz-Filho R Silveira ER Pessoa OD Jorge RJ Ximenes RM Monteiro HS Monteiro Evangelista JS Diz-Filho EB Toyama MH 《Journal of natural products》2011,74(10):2168-2173
Three new solanidane alkaloids bearing a 22,23-epoxy ring (1-3) and four known compounds were isolated from leaves of Solanum campaniforme. The structures were determined using spectroscopic techniques, including 1D and 2D NMR, and HRESIMS experiments. The antiophidic activity of the alkaloids was tested against Bothrops pauloensis venom. Compounds 1-3 completely inhibited myotoxicity without inhibiting phospholipase A2 activity of the venom, while hemorrhage and skin necrosis were significantly reduced in the presence of alkaloids 1 and 2. 相似文献
7.
S K Kalauni M I Choudhary F Shaheen M D Manandhar M B Atta-ur-RahmanGewali A Khalid 《Journal of natural products》2001,64(6):842-844
Two new steroidal alkaloids, (-)-vaganine D (1) [(20S)-20-(N,N-dimethylamino)-3 beta-(senecioylamino)-5 alpha-pregn-16-en-4 beta-yl acetate], and (+)-nepapakistamine A (2) [(20S)-20-(N-methylamino)-3 beta-(tigloylamino)-5 alpha-pregn-16-en-2 beta,4 beta-diacetate], were isolated from the leaves of Sarcococca coriacea. Their structures were elucidated on the basis of their spectral properties. Compounds 1 and 2 were found to be cholinesterase inhibitors. 相似文献
8.
Minor steroidal alkaloids from the marine sponge Corticium sp 总被引:1,自引:0,他引:1
Borbone N De Marino S Iorizzi M Zollo F Debitus C Esposito G Iuvone T 《Journal of natural products》2002,65(8):1206-1209
Four new steroidal alkaloids, plakinamine G (1), plakinamine H (2), 4alpha-hydroxydemethylplakinamine B (3), and tetrahydroplakinamine A (4), along with three known compounds, were isolated from the marine sponge Corticium sp. The structures of these metabolites were elucidated largely by 1D and 2D NMR methods and accurate mass measurements (HR-EIMS). Compounds 1, 2, and 4 show significant in vitro cytotoxicity. 相似文献
9.
10.
目的研究伊犁贝母Fritillaria pallidiflora鳞茎的化学成分。方法采用硅胶柱色谱、制备薄层色谱等色谱方法进行分离纯化,应用质谱、核磁等波谱技术鉴定化合物的结构。结果从伊犁贝母鳞茎80%乙醇水溶液提取物的环己烷部位分离得到4个化合物,分别鉴定为伊贝新(1)、伊贝嗪(2)、2′-甲氧基邪蒿内酯(3)、1-O-β-D-葡萄糖基-(2S,3S,4R,8Z)-2-[(2′R)-(2′-羟基二十二碳酰)氨基]-1,3,4-十八碳三醇-8-烯(4)。结论化合物1、2为新的甾体生物碱。 相似文献
11.
目的:利用反相高效液相色谱法快速测定龙葵中3种甾体生物碱的含量.方法:采用Agilent Zorbax SB-C1s(4.6mm×150 mm,5μm)色谱柱,以乙腈-1%磷酸为流动相,流速1.0 mL·min-1,进样量20μL,柱温30℃,205 nm条件下检测,以梯度洗脱方式在30 min内分离了澳洲茄碱、澳洲茄边碱和khasianine 3种生物碱.结果:澳洲茄碱含量测定的线性范围为0.860~10.320μg(r=0.999 7);澳洲茄边碱含量测定的线性范围为0.726~8.710μg(r=0.999 7);khasianine含量测定的线性范围为0.696~8.352μg(r=0.9998).方法的平均回收率分别为100.18%,99.08%,99.88%.结论:方法简便快速、准确度高,可用于龙葵药材的质量评价. 相似文献
12.
Three new alkaloids, the two pyrrolidine type alkaloids (1 and 2) and 6E-pandanamine (3), together with five known alkaloids (4-8), were isolated from the leaves of Pandanus amaryllifolius collected in West Java, Indonesia. All the new alkaloids have two alpha-methyl alpha,beta-unsaturated gamma-lactone moieties, while compound 2 also has an additional seven-membered ring, which has not been encountered before in Pandanus alkaloids. Two different extraction methods, namely, a solvent partitioning extraction and acid-base treatment, were tested, giving secondary and tertiary amines, respectively. Spectroscopic and chemical studies showed that the tertiary amines isolated from the acid-base treatment were artifacts formed during the extraction process. This finding suggests that the use of conventional acid-base treatment in isolating Pandanus alkaloids should be reviewed since it can introduce artifacts. 相似文献
13.
New alkaloids from Daphniphyllum calycinum 总被引:1,自引:0,他引:1
Four new alkaloids, 17-hydroxyhomodaphniphyllic acid (1), daphcalycinosidine C (2, a new iridoid alkaloid), yuzurimine E (3), and yuzurimic acid B (4), were isolated from the seeds of Daphniphyllum calycinum. The structures of these Daphniphyllum alkaloids were determined by spectroscopic analysis including mass spectrometry and 2D NMR. 相似文献
14.
New alkaloids from Cephalotaxus fortunei 总被引:4,自引:0,他引:4
Four new cephalotaxus alkaloids, cephalotaxine alpha-N-oxide (1), cephalotaxine beta-N-oxide (2), 11-beta-hydroxycephalotaxine beta-N-oxide (3), and isocephalotaxine (4), were isolated, together with several known alkaloids from an EtOAc extract of the fruits of Cephalotaxus fortunei. The structures were determined by spectral analysis including mass spectrometry and 2D NMR. Compounds 1, 2, 3, and 4 displayed cytotoxicity against nasopharynx KB cells with IC50 values of 30, 14, 31, and 15 micro g/mL, respectively. 相似文献
15.
New alkaloids from Annona purpurea 总被引:2,自引:0,他引:2
Three new alkaloids, promucosine (1), romucosine F (2), and romucosine G (3), along with 28 known compounds, were isolated from the MeOH extract of stems of Annona purpurea. The structures of 1-3 were determined on the basis of spectral data and chemical evidence. 相似文献
16.
The roots of Ruta chalepensis, collected from the northern Saudi desert, yielded two new quinoline alkaloids, namely, 2-?6'-(2H-benzo[d]1' ',3' '-dioxolen-5' '-yl)hexyl?-hydroquinolin-4-one (1) and 2-?6'-(2H-benzo[d]1' ',3' '-dioxolen-5' '-yl)hexyl?-4-methoxy-quinoline (2). Nine previously reported alkaloids, dictamnine, pteleine, skimmianine, rutacridone, isogravacridonechlorine, maculosidine, graveoline, graveolinine, and 4-methoxy-1-methyl-2(1H)-quinolinone, and coumarins, chalepensin, and umbelliferone were also isolated. Structure elucidations were based primarily on 1D and 2D NMR analyses and chemical transformations. Antimicrobial activity of these compounds is discussed. 相似文献
17.
Ten new bisindole alkaloids of the vobasinyl-ibogan type, viz., conodiparines A-F (1-6), conodutarines A and B (7, 8), and cononitarines A and B (9, 10), were obtained from the leaf extract of the Malayan species Tabernaemontana corymbosa. The structures were determined using NMR and MS analysis. 相似文献
18.
Khattak KF Atta-ur-Rahman Choudhary MI Hemalal KD Tillekeratne LM 《Journal of natural products》2002,65(6):929-931
Four new tropane alkaloids were isolated from the leaves of Erythroxylum moonii and identified as 3 alpha-isobutyryloxy-7 beta-hydroxynortropane (1), 3 alpha-hydroxy-7 beta-phenylacetoxynortropane (2), 3 alpha-cis-cinnamoyloxytropane (3), and 3 alpha-hydroxy-6 beta-(3'-hydroxy-2'-methyl-3'-phenylpropionyloxy)-7 beta-hydroxytropane (4). Other alkaloids isolated for the first time from E. moonii were 3 alpha-benzoyloxytropane, 3 alpha-phenylacetoxytropane, 3 alpha-trans-cinnamoyloxytropane, and 3 alpha-phenylacetoxy-6 beta,7 beta-dihydroxynortropane. The structures of compounds 1-4 were elucidated by spectroscopic methods. 相似文献
19.
Kozlovsky AG Vinokurova NG Adanin VM Burkhardt G Dahse HM Gräfe U 《Journal of natural products》2000,63(5):698-700
Four new diketopiperazine alkaloids (1-4) were isolated from cultures of Penicillium fellutanum, and their structures were determined by MS and NMR measurements. 相似文献
20.
From an acidic extract of Ulex jussiaei four new quinolizidine alkaloids, jussiaeiines A (1), B (2), C (3), and D (4), were isolated and characterized by spectroscopic methods together with (-)-cytisine, (-)-N-methylcytisine, and (-)-anagyrine. The proposed biosynthetic origin of these new alkaloids is briefly discussed. 相似文献