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1.
Chrysosplenium tetrandrum, from northern British Columbia, accumulates a variety of flavonoid glycosides. Several kaempferol and quercetin mono- and diglycosides were identified. The major flavonoid fraction consisted of O-methylated compounds having an hydroxyl or methoxyl substituent at position-6. Aglycones identified were 5,4′-dihydroxy-3,6,7-trimethoxyflavone, 5,6,7,3′,4′-pentahydroxy-3-methoxyflavone, 5,6,3′,4′-tetrahydroxy-3,7-dimethoxyflavone, 5,6,4′-trihydroxy-3,7,3′-trimethoxyflavone, 5,3′,4′-trihydroxy-3,6,7-trimethoxyflavone, and 5,4′-dihydroxy-3,6,7,3′-tetramethoxyflavone. All occurred as glucosides. The occurrence of 6-substitution and the preponderance of O-methylated flavonoids supports removal of Chrysosplenium from Engler's Saxifraginae. 相似文献
2.
T.J. Mabry 《Phytochemistry》1981,20(2):309-311
Two new highly oxygenated flavones were isolated from Artemisia frigida. Their structures were determined by spectroscopic methods as 5,7,4′-trihydroxy-6,3′,5′-trimethoxyflavone and 5,7,3′-trihydroxy-6,4′,5′-trimethoxyflavone. 相似文献
3.
Tharworn Jaipetch Vichai Reutrakul Pittaya Tuntiwachwuttikul Thawatchai Santisuk 《Phytochemistry》1983,22(2):625-626
5-Hydroxy-7-methoxyflavanone, 5,7-dimethoxyflavanone, 5-hydroxy-7-methoxyflavone 5-hydroxy-7,4′-dimethoxyflavone, 5,7-dimethoxyfiavone, 5,7,4′-trimethoxyflavone, 5,7,3′,4′-tetramethoxyflavone, 5-hydroxy-3,7-dimethoxyflavone, 5-hydroxy-3,7,4′-trimethoxyflavone, 3,5,7-trimethoxyflavone and 5-hydroxy-3,7,3′,4′-tetramethoxyflavone have been isolated from the black rhizomes of Boesenbergia pandurata. 相似文献
4.
Bernard Voirin Jean Favre-Bonvin V. Indra A.G.Ramachandran Nair 《Phytochemistry》1984,23(12):2973-2975
Majoranin isolated from Majorana hortensis and characterized earlier as 5,7,4′-trihydroxy-6,8,3′-trimethoxyflavone was found to be different from sudachitin of the same structure. Its true structure has been established as 5,6,4′-trihydroxy-7,8,3′-trimethoxyflavone (thymonin) by spectral data and direct comparison. 相似文献
5.
Chris O. Van Den Broucke Roger A. Dommisse Eddy L. Esmans Jozef A. Lemli 《Phytochemistry》1982,21(10):2581-2583
Three highly oxygenated flavones were isolated from leaves of Thymus vulgaris. Their structures were determined by spectroscopic methods as 5, 6, 4′-trihydroxy- 7, 8, 3′-trimethoxyflavone (thymonin), 5, 4′-dihydroxy-6, 7, 3′-trimethoxyflavone (cirsilineol) and 5, 4′-dihydroxy-6, 7, 8, 3′-tetramethoxyflavone. These flavones are reported for the first time in the genus Thymus. 相似文献
6.
From the aerial parts of Helichrysum chasmolycicum P.H Davis, which is an endemic species in Turkey, the flavonoids apigenin, luteolin, kaempferol, 3,5-dihydroxy-6,7,8-trimethoxyflavone, 3,5-dihydroxy-6,7,8,4′-tetramethoxyflavone, apigenin 7-O-glucoside, apigenin 4′-O-glucoside, luteolin 4′-O-glucoside, luteolin 4′,7-O-diglucoside, kaempferol 3-O-glucoside, kaempferol 7-O-glucoside and quercetin 3-O-glucoside were isolated. The methanol extract of the aerial parts of H. chasmolycicum showed antioxidant activity by DPPH method (IC50 0.92 mg/mL). Antimicrobial activity test was performed on the B, D, E extracts and also 3,5-dihydroxy-6,7,8-trimethoxyflavone and kaempferol 3-O-glucoside which were the major flavonoid compounds obtained from aerial parts of H. chasmolycicum by microbroth dilutions technique. The E (ethanol-ethyl acetate) extract showed moderate antimicrobial activity against Pseudomonas aeruginosa, B (petroleum ether-60% ethanol-chloroform) extract and 3,5-dihydroxy-6,7,8-trimethoxyflavone showed moderate antifungal activity against Candida albicans. 相似文献
7.
Frederic Jullien Bernard Voirin Jacques Bernillon Jean Favre-Bonvin 《Phytochemistry》1984,23(12):2972-2973
Six highly oxygenated flavones have been isolated from the leaves of Mentha piperita. Five known compounds, 5-hydroxy-6,7,8,4′-tetramethoxyflavone, 5,4′-dihydroxy-6,7,8-trimethoxyflavone, 5,3′-dihydroxy-6,7,8,4′-tetramethoxyflavone, 5-hydroxy-6,7,8,3′,4′-pentamethoxyflavone and 5,3′,4′-trihydroxy-6,7,8-trimethoxyflavone, are reported for the first time in the genus Mentha. The sixth compound has been identified as 5,6-dihydroxy-7,8,3′,4′-tetramethoxyflavone by UV, NMR and mass spectra. 相似文献
8.
《Phytochemistry》1987,26(7):2131-2133
Six known flavonoid aglycones and the newly described 5,7,4′-trihydroxy-3,3′,5′-trimethoxyflavone were isolated from Xanthocephalum gymnospermnoides var. gymnospermnoides. 相似文献
9.
Nineteen flavonoids were isolated from Artemisia ludoviciana var. ludoviciana, including a new 2′- hydroxy- 6-methoxyflavone, 5,7,2′,4′-tetrahydroxy-6,5′-dimethoxyflavone. The known compounds include quercetagetin 3,6,3′,4′-tetramethyl ether, eupatilin, 5,7-dihydroxy-3,6,8,4′-tetramethoxyflavone, luteolin 3′,4′-dimethyl ether, jaceosidin, 5,7,4′-trihydroxy-3,6-dimethoxyflavone, tricin, hispidulin, chrysoeriol, kaempferol 3-methyl ether, apigenin, axillarin, eupafolin, selagin and luteolin together with three flavones which were previously isolated for the first time from Artemisia frigida: 5,7,4′-trihydroxy-6, 3′,5′-trimethoxyflavone, 5,7,3′-trihydroxy-6,4′,5′-trimethoxyflavone and 5,7,3′,4′-tetrahydroxy-6,5′- dimethoxyflavone. 相似文献
10.
Ruben Dario Torrenegra Saul Escarria Bernd Raffelsberger Hans Achenbach 《Phytochemistry》1980,19(12):2795-2796
5,7-Dihydroxy-3,6,8-trimethoxyflavone was isolated from the flowers of Gnaphalium elegans. The structure elucidation is based mainly on proton resonance studies using Eu(fod)3 shift reagent. 相似文献
11.
《Phytochemistry》1986,25(2):561-562
5,6,4′-Trihydroxy-7,3′-dimethoxyflavone, 5,6-dihydroxy-7,3′,4′-trimethoxyflavone, luteolin, diosmetin, vicenin-2 and luteolin 7-rutinoside have been isolated and identified from Thymbra capitata. The occurrence of these compounds supports the inclusion of this plant in the genus Thymbra, rather than Thymus or Corydothymus. 相似文献
12.
Two new flavones, 3,5,6,7-tetramethoxyflavone and 3,6-dimethoxy-5,7-dihydroxyflavone together with 3,5,7-trimethoxyflavone have been identified from a whole plant extract of Gomphrena martiana. 相似文献
13.
5,8-Dihydroxy-3,6,7-trimethoxyflavone and 5,8-dihydroxy-6,7-dimethoxyflavone were isolated from aerial parts of Gnaphalium gaudichaudianum and identified by spectral data. 相似文献
14.
T. Namba M. Hattori Y. Takehana M. Tsunezuka T. Tomimori H. Kizu Y. Miyaichi 《Phytochemistry》1983,22(4):1057-1058
A new flavone was isolated from Artemisia capillaris and its structure was determined by spectroscopic methods as 5,2′,4′-trihydroxy-6,7,5′-trimethoxyflavone. 相似文献
15.
Werner Herz Seringolam V. Govindan Ingrid Riess-Maurer B. Kreil Hildebert Wagner Lorand Farkas Janos Strelisky 《Phytochemistry》1980,19(4):669-672
Two new flavones, 3′,4′-methylenedioxy-5,6,7,8,5′-pentamethoxyflavone and 5,7,4′-trihydroxy-6,3′,5′-trimethoxyflavone, have been isolated from Conoclinium coelestinum. Final structure proof was accomplished by synthesis. 相似文献
16.
《Phytochemistry》1986,25(11):2551-2553
Ten flavonoids have been isolated from a dichloromethane leafwash of Perityle vaseyi. Trace amounts of 7,4′-dimethylnaringenin were observed along with nine O-methylated flavonols. Two kaempferol, four 6-hydroxykaempferol and three 6-hydroxyquercetin O-methylated derivatives were identified. 5,7,4-Trihydroxy-3,6-dimethoxyflavone and 5,4′-dihydroxy-3,6,7-trimethoxyflavone were the major components. 相似文献
17.
《Phytochemistry》1987,26(7):2079-2083
Four new 6-hydroxyflavonols have been isolated from Blumea malcolmii and identified as 6-hydroxy-3,5,7,4′-tetramethoxyflavone, 6,2′,5′-trihydroxy-3,5,7-trimethoxyflavone, 6,5′-dihydroxy-3,5,7,2′-tetramethoxyflavone and 6-hydroxy-3,5,7,2′,5′-pentamethoxyflavone, by spectral data coupled with some chemical correlations. 相似文献
18.
The perennial American desert shrub, Gutierrezia microcephala, contains 20 flavonol methyl ethers displaying nine different oxygenation patterns. These include 11 new flavonols: 5,7-dihydroxy-3,6,8,3′,4′,5′-hexamethoxyflavone, 5,7,4′-trihydroxy-3,6,8,3′,5′-pentamethoxyflavone, 5,7,3′-trihydroxy-3,6,8,4′,5′-pentamethoxyflavone, 5,7,2′,4′-tetrahydroxy-3,6,8,5′-tetramethoxyflavone, 5,7,3′,4′-tetrahydroxy-3,6,8-trimethoxyflavone, 5,7,8,3′,4′-pentahydroxy-3,6-dimethoxyflavone, 3,5,7,3′,4′-pentahydroxy-6,8-dimethoxyflavone, 5,7,4′-trihydroxy-3,6,8-trimethoxyflavone, 5,7,8,4′-tetrahydroxy-3,3′-dimethoxyflavone, 5,7,8,3′,4′-pentahydroxy-3-methoxyflavone and 5,7,8,4′-tetrahydroxy-3-methoxyflavone. In addition, the following known flavonols were isolated: 5,7-dihydroxy-3,8,3′,4′,5′-pentamethoxyflavone, 5,7,4′-trihydroxy-3,8-dimethoxyflavone, 5,7,4′-trihydroxy-3,8,3′-trimethoxyflavone, 5,7,3′,4′-tetrahydroxy-3,8-dimethoxyflavone, 5,7,4′-trihydroxy-3,6,3′-trimethoxyflavone, 5,7,3′,4′-tetrahydroxy-3-methoxyflavone, 5,4′-dihydroxy-3,6,7,8,3′-pentamethoxyflavone, 5,7,4′-trihydroxy-3,6,8,3′-tetramethoxyflavone and 3,5,7,4′-tetrahydroxy-6,8,3′-trimethoxyflavone. 相似文献
19.
An examination of four species of Cirsium disclosed the presence of two new flavonoids in C. lineare. The structure of one was 5,4′-dihydroxy-6,7,3′-trimethoxyflavone (cirsilineol) 4′-monoglucoside and the other 5,3′,4′-trihydroxy-6,7-dimethoxyflavone (cirsiliol) 4′-monoglucoside. Luteolin 7-glucoside was found in C. suffultum, and pectolinarin and linarin in C. kamtschaticum and C. pectinellum. 相似文献
20.
C-Glycosylation of 5,7-dihydroxy-3′,4′,5′-trimethoxyflavone was carried out with acetobromo-α-d-glucose, -α-d-galactose, -α-d-xylose, -β-l-arabinose and -αt-L-rhamnose. The respective 6-C-glycosides and 6, 8-di-C-glycosides (excepted for galactose) were isolated and permethylated. MS and TLC comparison confirmed the proposed structures of five natural tricetin-derived C-glycosides. 相似文献