Results 221 to 230 of about 52,286 (257)

Xanthones of Comastoma pedunlulatum

China Journal of Chinese Materia Medica, 2010
The xanthones in the ethyl acetate extract of Comastoma pedunlulatum were investigated. The chromatographic and spectroscopic techniques were used to isolate and identify the constituents. Nine xanthones were isolated from the active parts of the ethyl acetate portion of the 70% ethanolic extract of C.
Yi, Yuan, Baosong, Cui, Ying, Zhang, Shuai, Li   +3 more
openaire   +2 more sources

Xanthones from Swertia punctata

Phytochemistry, 2002
Isolation of 1-O-primeverosyl-3,8-dihydroxy-5-methoxyxanthone and 1-O-gentiobiosyl-3,7-dimethoxy-8-hydroxyxanthone, along with five known xanthones, isobellidifolin, methylbellidifolin, isoswertianin, methylswertianin and norswertianin-1-O-beta-D-glucoside, from the roots of Swertia punctata is reported. In the aerial parts four xanthones, bellidifolin,
Menkovic, N, Savikin-Fodulovic, K, Bulatović, V., Aljančić, Ivana, Juranic, N, Macura, S, Vajs, Vlatka, Milosavljević, Slobodan   +7 more
openaire   +4 more sources

Microwave‐Assisted Xanthone Synthesis

Synthetic Communications, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
E. A. Evangelista, M. R. C. Couri, R. B. Alves, D. S. Raslan, R. P. F. Gil   +4 more
openaire   +1 more source

Xanthones as Potential Antioxidants

Current Medicinal Chemistry, 2013
Xanthones (dibenzo-γ-pyrones) constitutes an important class of oxygenated heterocycles and occur as secondary metabolites in plants and microorganisms. They are known for various biological activities such as antioxidant, monoamine oxidase inhibitor, antihypertensive, hepatoprotective, antithrombotic, antifungal and anticancer.
S S, Panda, M, Chand, R, Sakhuja, S C, Jain   +3 more
openaire   +2 more sources

Xanthones from Hypericum roeperanum

Phytochemistry, 1996
Four new xanthones have been isolated from the roots of Hypericum roeperanum. Their structures have been established by a combination of spectroscopic and chemical methods as 1,6-dihydroxy-5-methoxy-4',5'-dihydro-4',4',5'-trimethylfurano- (2',3':3,4)-xanthone (5-O-methyl-2-deprenylrheediaxanthone B), 1,6-dihydroxy-5-methoxy-6',6'-dimethylpyrano-(2',3 ...
G, Rath, O, Potterat, S, Mavi, K, Hostettmann   +3 more
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Xanthones-A Structural Perspective

Current Medicinal Chemistry, 2005
Xanthones, synthesized or isolated from a natural source, display a wide range of biological and pharmacological activities. In a few cases, their chemical characterization has involved the structure elucidation by single crystal X-ray diffraction.
L, Gales, A M, Damas
openaire   +2 more sources

Xanthone: A Promising Antimycobacterial Scaffold

Medicinal Chemistry, 2021
Background: Tuberculosis (TB) is one of the infectious diseases associated with high rate of morbidity and mortality and still remains one of the top-ten leading causes of human death in the world. The development of new anti-TB drugs is mandatory due to the existence of latent infection as well as the expansion of the resistant Mycobacterium ...
Tilal, Elsaman, Malik Suliman, Mohamed, Eyman Mohamed, Eltayib, Abualgasim Elgaili, Abdalla, Magdi Awadalla, Mohamed   +4 more
openaire   +2 more sources

Novel xanthones from Garcinia mangostana, structures of BR-xanthone-A and BR-xanthone-B

Phytochemistry, 1988
Abstract The chemical examination of the dry fruit hulls of Garcinia mangostana yielded, in addition to known xanthones, two new xanthones, a bis-pyrano xanthone, BR. xanthone- A and 1-methoxy-2,4,5-trihydroxyxanthone, BR-xanthone-B. Evidence of their structures is presented.
Krishnamoorthi Balasubramanian, Krishnamoorthi Rajagopalan   +1 more
openaire   +1 more source

Xanthone Analogue of Geiparvarin

Archiv der Pharmazie, 1985
AbstractThe synthesis and the pharmacological properties of the xanthone analogue of geiparvarin, a naturally occurring antitumor coumarin, are described.
P, Valenti, M, Recanatini, P, Da Re, W, Galimbeni, N, Avanzi, S, Filippeschi   +5 more
openaire   +2 more sources

Sulfonated Xanthones from Hypericum sampsonii.

ChemInform, 2004
Xanthones, 1,3-dihydroxy-5-methoxyxanthone-4-sulfonate and 1,3-dihydroxy-5-O-beta-D-glycopyranosylxanthone-4-sulfonate, together with nine known compounds were obtained from H. sampsonii. This is the first report of sulfonated xanthonoids. Furthermore, compounds 1 and 2 exhibited significant cytotoxicity against the P388 cancer cell line.
Di, Hong, Feng, Yin, Li-Hong, Hu, Ping, Lu   +3 more
openaire   +2 more sources