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1.
Chemistry of Natural Compounds - A new geranylated lignan, named 8′-geranylated lignan A (1), and a known lignan (2) were isolated from Oenanthe javanica (Blume) DC., to our knowledge, for... 相似文献
2.
Six crystalline compounds, isocedrolic acid, δ-cadinol, emodin, sugiol, Δ5-dehydrosugiol, and a new lignan phenol were isolated from the acetone extractive of wood of Juniperus formosana Hayata. The new lignan phenol was established as detetrahydro-conidendrin by chemical and physical evidence. 相似文献
3.
Saracoside: a new lignan glycoside from Saraca indica, a potential inhibitor of DNA topoisomerase IB
Mukherjee T Chowdhury S Kumar A Majumder HK Jaisankar P Mukhopadhyay S 《Natural product communications》2012,7(6):767-769
Chemical investigation of the stem bark of Saraca indica has resulted in the isolation of a new lignan glycoside, saracoside, along with four known lignan glycosides lyoniside, icariside E3, (+)5'-methoxyisolarciresinol-9'-O-beta-D-glucopyranoside and nudiposide, and a phenolic glucopyranoside, 3,4,5-trimethoxyphenyl-beta-D-glucopyranoside, which has been isolated for the first time from this species. The isolated lignan glycosides exhibit potent DNA topoisomerase IB inhibitory activity. 相似文献
4.
The chemical properties and synthetic modifications of the natural lignan hydroxymatairesinol in basic and acidic nucleophilic media were studied. Hydroxymatairesinol presumably reacts via a quinone methide and a carbonium ion mechanism under basic and acidic conditions, respectively. In these conditions the benzylic hydroxyl group was displaced by nucleophiles yielding new 7-substituted butyrolactone lignans. Reactions in alcoholic basic solutions yielded the 7-alkoxy ethers diastereoselectively. Several previously known lignans as well as new lignans and lignan derivatives were synthesised. The transformations were monitored and the products identified by HPLC-MS and NMR. 相似文献
5.
The discovery of a new Pd-catalyzed benzannulation reaction of bisbenzylidenesuccinimide during process research on arylnaphthalene lignan aza-analogues is described. An extension of the Pd-catalyzed benzannulation to the regiospecific synthesis of various arylnaphthalene lignan aza-analogues utilizing classical Stobbe condensation is included. 相似文献
6.
A. S. R. Anjaneyulu A. Madhusudhana Rao V. Kameswara Rao L. Ramachandra Row 《Tetrahedron letters》1975,16(52):4697-4700
A new lignan from is shown to be 1, 2a-dihydroxy-2e-piperonyl-6e-(6″-bromopiperonyl)-3, 7-dioxabicyclo-[3,3,0]-octane, the first example of a bromine containing lignan. 相似文献
7.
Nakanishi T Inatomi Y Murata H Shigeta K Iida N Inada A Murata J Farrera MA Iinuma M Tanaka T Tajima S Oku N 《Chemical & pharmaceutical bulletin》2005,53(2):229-231
A new 4alpha-aryltetralin-type lignan called burseranin (1) and a known analogous lignan picropolygamain (2) were isolated along with known triterpenes, lupeol and epi-lupeol from the methanol extract of stems of Bursera graveolens, which showed a remarkable inhibitory activity against human HT1080 fibrosarcoma cells. The whole structure of 1 was established based on combined spectral studies and the absolute structure for 2 was first confirmed by CD spectral evidence. In addition, cytotoxic activities of the stem (methanol) extract and its components are evaluated in this paper. 相似文献
8.
Jiang ZH Tanaka T Iwata H Sakamoto S Hirose Y Kouno I 《Chemical & pharmaceutical bulletin》2005,53(3):339-341
Three new ellagitannins named balanophotannins A-C having a 1,1'-(3,3',4,4'-tetrahydroxy)dibenzofurandicarboxyl group in their molecules and four known lignan glycosides were isolated from the extracts of fresh aboveground and underground parts of a medicinal parasitic plant Balanophora japonica (Balanophoraceae). Their structures were elucidated on the basis of spectral and chemical evidence. Chemotaxonomic significance of the known lignan glycosides in Balanophora japonica was discussed. 相似文献
9.
A new lignan, formosanol, has been isolated from Juniperus formosana Hayata and elucidated as formula (5a) by spectra and chemical evidences. 相似文献
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11.
翼梗五味子的研究 V: 五脂素A1, A2, 表五脂A1和epischisandrone的结构 总被引:1,自引:0,他引:1
从四川宜宾产翼梗五味子的果实中分得七个四氢萘木脂素, 其中三个鉴定为: 恩施辛enshicine, 表恩施辛epienshicine和schisandrone, 其余四个均属新化合物, 命名为五脂素wnlignan A1, 五脂素A2, 表五脂素epiwnlignan A1和epischisandrone. 它们的结构(包括绝对构型)由光谱分析和化学转化为(+)-dimethylguaiacine和(-)-dimethylisoguaiacine而阐明. 四个新化合物皆有不同程度的体外抗癌活性. 相似文献
12.
A new lignan, stellerachama A (1), was isolated from the roots of Stellera chamaejasme. The structure of the new compound was elucidated by analysis of spectrometric data. 相似文献
13.
Yokosuka A Matsuo Y Jitsuno M Adachi K Mimaki Y 《Chemical & pharmaceutical bulletin》2011,59(12):1467-1470
Two new lignan glycosides, named larrealignans A (1) and B (2), and a known lignan (3) were isolated from the aerial parts of Larrea tridentata (Zygophyllaceae). The structures of 1 and 2 were determined on the basis of spectroscopic analysis and the results of hydrolytic cleavage. The isolated compounds (1-3) and aglycones (1a, 2a) of 1 and 2 were evaluated for their cytotoxic activities against HL-60 human leukemia cells. 相似文献
14.
A new lignan, taiwanin H, has been isolated from the barks of Taiwania cryptomerioides Hayata and elucidated as formula ( 6a ) by chemical and physical evidence. 相似文献
15.
Won Se Suh Ki Hyun Kim Ho Kyung Kim Sang Un Choi Kang Ro Lee 《Helvetica chimica acta》2015,98(8):1087-1094
Two new aryl‐tetralin lignan glycosides, linderanosides A and B ( 1 and 2 , resp.), and a new dihydrobenzofuran neolignan glycoside, linderanoside C ( 3 ), together with five known lignan derivatives ( 4 – 8 ) were isolated from the trunk of Lindera glauca. The structures of these new compounds were determined through spectroscopic analyses, including extensive 2D‐NMR data and acid hydrolysis. The absolute configurations of the compounds were clarified by circular dichroism (CD) spectroscopic studies. Compounds 1 – 8 were evaluated for their cytotoxicity against A549 (non‐small cell lung adenocarcinoma), SK‐OV‐3 (ovarian cancer cells), A498 (human kidney epithelial cells), and HCT‐15 (colon cancer cells) human tumor cell lines using sulforhodamine B assays in vitro. 相似文献
16.
A new lignan, cagayanin, has been isolated from the nutmeg of Myristica cagayanensis Merr. and elucidated as formula (5) by spectral and chemical evidence. 相似文献
17.
Tra Nguyen Thanh Thuy Nguyen Ngoc Nhu Van Tuyen Nguyen Ha Nguyen Thi Thu Anh Le Thi Tu Son Ninh The 《Chemistry of Natural Compounds》2022,58(4):607-609
Chemistry of Natural Compounds - Phytochemical investigation of the ethyl acetate extract of Styrax annamensis leaves has led to the isolation and determination of a new lignan,... 相似文献
18.
A new pregnane glycoside, a dibenzylbutyrolactone lignan, 5-hydroxymatairesinol dimethyl ether, and three new flavonoids, including one 8-methylflavan-3-ol, and two 8-methylflavones, together with five known flavonoids and two known alkaloids were isolated from the rhizomes of Tupistra chinensis. The structures of all compounds were elucidated by spectral studies. 相似文献
19.
A new lignan, 5‐hydroxyjusticidin A (= 9‐(1,3‐benzodioxol‐5‐yl)‐5‐hydroxy‐4,6,7‐trimethoxynaphtho[2,3‐c]furan‐1(3H)‐one; 1 ), and four new diphyllin‐type lignan glycosides, mananthosides C–F ( 2 – 5 ), containing glucosyl (Glc), arabinosyl (Ara), galactosyl (Gal), and/or apiosyl residues, have been isolated from Mananthes patentiflora, together with five known compounds. Their structures and configurations were elucidated by in‐depth 1D‐ and 2D‐NMR experiments, as well as MS analysis. 相似文献
20.
Li HR Feng YL Yang ZG Wang J Daikonya A Kitanaka S Xu LZ Yang SL 《Chemical & pharmaceutical bulletin》2006,54(7):1022-1025
In vitro anti-allergic screening of medicinal herbal extracts revealed that the chloroform extract of the rhizoma of Kadsura coccinea inhibited nitric oxide (NO) production in a lipopolysaccharide (LPS) and recombinant mouse interferon-gamma (IFN-gamma) activated murine macrophage like cell line RAW 264.7. Further fractionation of the chloroform extract led to the isolation of three new lignans, including two dibenzocyclooctadiene lignans and one arylnaphthalene lignan, together with other three known dibenzocyclooctadiene lignans. This is the first report of NO production inhibitory activity of Kadsura coccinea and first report about the isolation of arylnaphthalene lignan from K. coccinea. 相似文献