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1.
The isolation and structure elucidation of two new triterpenes named feroniellides A (1) and B (2) from Feroniella lucida are described. Feroniellide A has a novel dioxabicyclic [3.2.1]octane moiety, and feroniellide B is the C-3 epimer of the known triterpenoid 3. Their overall structures and relative configurations were established by combined spectral data analysis. The cytotoxicity of 1 and 2 was also evaluated against human KB and HeLa carcinoma cells. 相似文献
2.
Three new isomeric furanocoumarins named feroniellic acids A-C (1-3) were isolated from the BuOH extract of Feroniella lucida roots. They are diastereomerically different to each other in configuration at C-2″ and C-3″. The structures were elucidated on the basis of spectroscopic data while their configurations were established by synthesis of model compounds together with application of Mosher’s method. 相似文献
3.
Preecha Phuwapraisirisan Serm Surapinit Sitthidesch Sombund Santi Tip-pyang 《Tetrahedron letters》2006,47(22):3685-3688
Three new furanocoumarins, named feroniellins A (1), B (2), and C (3), were isolated from the roots of Feroniella lucida. Compounds 1-3 are novel structures having an oxolane, oxane, and oxepane moiety. Their overall structures and configurations were determined by spectral and chemical methods. The cytotoxicities of 1-3 were evaluated against human KB and HeLa carcinoma cells. 相似文献
4.
Shi-Ji Xiao Xin-Xiang Lei Bing Xia Dan-Qing Xu Hong-Ping Xiao Hong-Xi Xu Fang Chen Li-Sheng Ding Yan Zhou 《Tetrahedron letters》2014
Two novel lignans, gymnothespirolignans A (1) and B (2), possessing a rare polycyclic spiro skeleton, were isolated from the endemic plant of Gymnotheca involucrata Pei. Their structures were determined by spectroscopic evidences and the absolute configurations were confirmed by single crystal X-ray diffraction analysis. Compounds 1 and 2 showed promising antiviral activities against RSV with an IC50 value of 31.87 and 17.51 μM, respectively. 相似文献
5.
Chromatographic separation of chloroform extracts of the heartwood of Taxus baccata L. has yielded two new dibenzylbutane type lignans, together with a known lignan. Their structures were established as 3′-demethylisolariciresinol-9′-hydroxy isopropylether (1) and 3-demethylisolariciresinol (2) and isolariciresinol (3) on the basis of 1D- and 2D-NMR spectroscopic analysis. Compounds 1 and 2 were identified as new lignans of isolariciresinol derivatives. Compound 1 is the first lignan with a hydroxyisopropyl group at C-9′. Molecular mechanic calculations of these compounds were carried out by using mm3 program. Furthermore, the conformations of these three compounds were computed with the semi-empirical molecular orbital methods AM1 and PM3 by using X-ray crystal structure results of similar compounds. So, three-dimensional, the most probable structure of these compounds were obtained, compared and discussed. 相似文献
6.
Jian-Hong Yang Hai-Yan ZhangXue Du Wei WangWei-Lie Xiao Jin WenJian-Xin Pu Xi-Can TangHan-Dong Sun 《Tetrahedron》2011,67(25):4498-4504
Fourteen new dibenzocyclooctadiene lignans, ananonins A-N (1-14), together with five known compounds, were isolated from the seeds of Kadsura ananosma. The structures and absolute configurations of 1-14 were established using a combination of MS, NMR, and CD techniques. The biological activity of these compounds was evaluated, and ananonin M (13) showed moderate neuroprotective effects in an in vitro assay. 相似文献
7.
Kongkiat Trisuwan Sirada Boonyaketgoson Vatcharin Rukachaisirikul Souwalak Phongpaichit 《Tetrahedron letters》2014
Three new xanthones, xanthochymones A–C (1–3), together with six known compounds including two xanthones, three biflavanoids, and one mellein derivative are isolated from the methanol extract of the twigs of Garcinia xanthochymus. Their structures are identified on the basis of their spectroscopic data. Compound 3 displays moderate antibacterial activity against Staphylococcus aureus while compounds 2 and 3 are weakly active against methicillin-resistant S. aureus. 相似文献
8.
Vatcharin Rukachaisirikul Wanpen Naklue Nongporn Hutadilok Towatana 《Tetrahedron》2006,62(36):8578-8585
Seven phloroglucinols, named parvifoliols A-G (1-7), two depsidones, named parvifolidones A, B (8, 9), and three xanthones, named parvifolixanthones A-C (10-12), were isolated from the twigs of Garcinia parvifolia along with seven known compounds: garcidepsidone B, mangostinone, rubraxanthone, dulxanthone D, 1,3,5,6-tetrahydroxyxanthone, norathyriol, and (2E,6E,10E)-(+)-4β-hydroxy-3-methyl-5β-(3,7,11,15-tetramethylhexadeca-2,6,10,14-tetraenyl)cyclohex-2-en-1-one. Their structures were proposed on the basis of spectroscopic data. The antibacterial and antioxidation activities were evaluated. 相似文献
9.
Young-Won Chin 《Tetrahedron letters》2004,45(2):339-341
Four novel lignans were isolated from the rhizomes of Rodgersia podophylla. It is interesting to note that an unusual 2,4-dihydroxyphenyl moiety was found in these compounds in addition to an acetylenic functionality in compounds 3 and 4. 相似文献
10.
Yusuke Hirasawa Yuri Kato Chin Piow Wong Nahoko Uchiyama Yukihiro Goda A. Hamid A. Hadi Hapipah Mohd Ali Hiroshi Morita 《Tetrahedron letters》2014
A novel C16N2-type Lycopodium alkaloid consisting of a quinolizidine with a 6-dimethylaminohexyl side chain, hupermine A (1), was isolated from the club moss of Huperzia phlegmaria, and the structure and relative stereochemistry were elucidated on the basis of spectroscopic data. 相似文献
11.
A novel ergosterol conjunction-type alkaloid, hericirine (1), was isolated from the dried fruiting bodies of Hericium erinaceum. The overall framework of 1 was isolated, and combined with hericerin and ergosterol. Its structure was elucidated based on spectroscopic analysis using 1D and 2D NMR, IR and HRESIMS techniques. We found that hericirine significantly inhibited protein expression of iNOS and COX-2 and reduced NO, PGE2, TNF-α, IL-6 and IL-1β production in RAW264.7 cells exposed to LPS. 相似文献
12.
13.
Cochinchistemonine (1), an alkaloid with a novel skeleton, was isolated from the roots of Stemona cochinchinensis collected from northern Vietnam. Its structure was established on the basis of one- and two-dimensional NMR and other spectroscopic studies. The relative configuration was confirmed by single crystal X-ray diffraction experiment. 相似文献
14.
A novel Lycopodium alkaloid, lycopladine H (1), with a fused-tetracyclic ring system consisting of an azocane ring connected to a [2,2,2]-bicyclooctane ring and a 3-piperidone ring, was isolated from the club moss Lycopodium complanatum. The structure and relative stereochemistry of 1 were elucidated on the basis of spectroscopic data. 相似文献
15.
Ernesto Fattorusso Orazio Taglialatela-Scafati M. Janib Achmad Carlo Cerrano 《Tetrahedron letters》2008,49(14):2189-2192
A new member of the family of zoanthamine-type alkaloids, lobozoanthamine (1), has been isolated from the Indonesian soft coral Lobophytum sp. This represents the first report of a zoanthamine-type alkaloid from a marine invertebrate different from zoanthids. The densely functionalized heptacyclic stereostructure of lobozoanthamine (1) has been established through the interpretation of 2D NMR data and application of the modified Mosher method. 相似文献
16.
Yuan-Bin Cheng Chih-Chin Lan Wei-Chun Liu Wan-Chun Lai Yu-Chi Tsai Michael Y. Chiang Yang-Chang Wu Fang-Rong Chang 《Tetrahedron letters》2014
A chemical investigation of Zoanthus kuroshio has yielded two new alkaloids, kuroshines A (1) and B (2). The compounds possess a densely functionalized ring system on the basis of the zoanthamine frames. The structures of 1 and 2 were elucidated through interpretation of spectroscopic methods, especially 2D NMR techniques (COSY, HMQC, HMBC, and ROESY). The absolute stereochemistry of 1 was further confirmed by an X-ray single crystallographic analysis using a mirror Cu-Kα radiation. 相似文献
17.
Koichiro Koyama Yusuke Hirasawa Tomohiro Hoshino Norimichi Nakahata 《Tetrahedron》2005,61(15):3681-3690
Seven new Lycopodium alkaloids, lannotinidines A-G (1-7), have been isolated from the club moss Lycopodium annotinum and L. annotinum var. acrifolium. Stereochemistry of 1-7 was elucidated by combination of NOESY correlations and chemical transformation. Lannotinidines B-E (2-5) elevated NGF mRNA expression. 相似文献
18.
Mariana G. Vallejo Maria Gabriela OrtegaJosé L. Cabrera Alicia Mariel Agnese 《Tetrahedron letters》2013
The present study describes the isolation and identification of N-demethyl-sauroxine, a novel Lycopodium alkaloid obtained from Huperzia saururus (Lam.) Trevis. (Lycopodiaceae). Its structure and relative stereochemistry were elucidated on the basis of its spectral data and chemical correlations. Additionally, acetylcholinesterase inhibitory activity was evaluated (IC50 = 209.6 ± 1.1 μM). The structure of the already identified alkaloid sauroxine was also re-validated through two dimensional NMR data. 相似文献
19.
A novel Daphniphyllum alkaloid with an unprecedented tetracyclic ring system consisting of an octahydroindole and a hexahydroazulene rings, daphniglaucin C (1), has been isolated from the leaves of Daphniphyllum glaucescens and the structure and relative stereochemistry were elucidated on the basis of spectroscopic data. Daphniglaucin C (1) inhibited the polymerization of tubulin. 相似文献
20.
Yanhui Fu Hongping HeYingtong Di Shunlin LiYu Zhang Xiaojiang Hao 《Tetrahedron letters》2012,53(28):3642-3646
Mekongenine A (1) possessing an unprecedented structure constituted from the union of a rare 2,7-seco eburnamine half and an aspidospermine alkaloid, together with a new bisindole alkaloid, mekongenine B (2), consisting of an eburnamine-aspidospermine type skeleton, was isolated from Bousigonia mekongensis. Their structures were elucidated by means of spectroscopic methods and those of 2 were further confirmed by X-ray diffraction. The absolute configurations of 1 and 2 were determined by comparison of quantum chemical TDDFT calculated and experimental ECD spectra. Mekongenines A (1) and B (2) exhibited cell growth inhibitory activities against various human cancer cell lines. 相似文献