Results 161 to 170 of about 11,180 (215)

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
openaire   +2 more sources

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

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‐enriched fraction of Garcinia mangostana and α‐mangostin improve the spatial learning and memory of chronic cerebral hypoperfusion rats

The Journal of pharmacy and pharmacology, 2020
Xanthones isolated from the pericarp of Garcinia mangostana has been reported to exhibit neuroprotective effect.
N. Tiang, M. Ahad, V. Murugaiyah, Z. Hassan   +3 more
semanticscholar   +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

Symmetrically Substituted Xanthone Amphiphiles Combat Gram-Positive Bacterial Resistance with Enhanced Membrane Selectivity

Journal of Medicinal Chemistry, 2017
Shuimu Lin, Jun-Jie Koh, Thet Tun Aung
exaly   +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

Xanthones fromChironia krebsii

Phytochemistry, 1991
Abstract From a dichloromethane extract of the aerial parts and from a methanolic root extract of Chironia krebsii , 11 1-hydroxyxanthones and six xanthone glycosides have been isolated. The glycosides 5-hydroxy-3-methoxy-1- O -primeverosylxanthone, 1-hydroxy-3-methoxy-5- O -primeverosylxanthone, 5-hydroxy-3-methoxy-1- O -β- d -glucosyl-xanthone, 3,5,
J.-L. Wolfender, M. Hamburger, J. Msonthi, K. Hostettmann   +3 more
openaire   +1 more source

Structure of xanthone

Acta Crystallographica Section C Crystal Structure Communications, 1990
C 13 H 8 O 2 cristallise dans P2 1 2 1 2 1 avec a=14,072, b=13,627, c=4,878A, Z=4 ; affinement jusqu'a R=0,077. La molecule est plane sauf pour l'atome O du carbonyl (0,13A hors du plan). Les cycles benzene ne sont pas des hexagones reguliers mais la distorsion est symetrique et la molecule a la symetrie C 2v approximative. Il n'y a pas de distances
S. Onuma, K. Iijima, I. Oonishi
openaire   +1 more source

Photochemical Deracemization of Chiral Sulfoxides Catalyzed by a Hydrogen-Bonding Xanthone Sensitizer

Synthesis, 2019
Several chiral sulfoxides with a lactam hydrogen-bonding site were prepared and their photochemical behavior was studied in the presence of xanthone and thioxanthone sensitizers.
Laura Wimberger, T. Kratz, T. Bach
semanticscholar   +1 more source