Results 231 to 240 of about 15,472 (254)

A xanthone from Shultesia guianensis

Fitoterapia, 2001
The isolation of 1-hydroxy-3,7-dimethoxyxanthone (1) from Shultesia guianensis is reported along with relevant NMR spectra, including new data by two-dimensional NMR experiments (HMQC and HMBC).
F J, Monte, F P, Soares, R, Braz-Filho
openaire   +2 more sources

Naturally-Occurring Xanthones: Recent Developments

Current Medicinal Chemistry, 2005
A literature survey covering the report of naturally occurring xanthones from January 2000 to December 2004, with 219 references, is presented in this review. Among 515 xanthones reported in this period, 278 were new natural xanthones. These xanthones have been identified from 20 families of higher plants (122 species in 44 genera), fungi (19 ...
L M M, Vieira, A, Kijjoa
openaire   +2 more sources

New Xanthones from Psorospermum febrifugum

Journal of Natural Products, 1987
The isolation and structural determination of two new xanthone derivatives, 1,2,4-trimethoxy-3,8-dihydroxyxanthone, 1,2,4-trimethoxy-3-hydroxyxanthone and a known 2-methoxy-3-hydroxyxanthone from Psorospermum febrifugum var. ferrugineum are reported. The structures were elucidated by extensive analysis of 1H and 13C nmr, ms, and chemical correlations.
A M, Habib, K S, Reddy, T G, McCloud, C J, Chang, J M, Cassady   +4 more
openaire   +2 more sources

Synthesis of Xanthones: An Overview

Current Medicinal Chemistry, 2005
Among the known synthetic routes to obtain xanthones, the Grover, Shah, and Shah reaction, the cyclodehydration of 2, 2-dihydroxybenzophenones and electrophilic cycloacylation of 2-aryloxybenzoic acids are the most popular methods. Due to important biological applications of xanthones, some synthetic strategies leading to more complex derivatives ...
M E, Sousa, M M M, Pinto
openaire   +2 more sources

Tetraoxygenated Xanthones from Centaurium erythraea

Natural Product Letters, 2000
Abstract Three tetraoxygenated xanthones, 1,6-dihydroxy-3,5-dimethoxyxanthone, 3-hydroxy-1,5,6-trimethoxyxanthone and 1,3,5-trihydroxy-2-methoxyxanthone, were isolated for the first time from the aerial parts of C. erythraea. Their structures were established by spectroscopic means and by comparison with literature references.
Valentão, Patrícia, Areias, Filipe M., Amaral, Joana S., Andrade, Paula B., Seabra, Rosa M.   +4 more
openaire   +2 more sources

Xanthones ofGarcinia cowa

Planta Medica, 1994
Five xanthones have been isolated from Garcinia cowa Roxb. (Guttiferae): cowanin (1), cowanol (2), cowaxanthone (3), 1,3,6-trihydroxy-7-methoxy- 2-5-bis(3-methyl-2-butenyl)xanthone (4), and norcowanin (5). The structures were assigned by spectroscopic studies. Xanthones 2 and 3 showed moderate antimicrobial activity against Staphylococcus aureus.
P, na Pattalung, W, Thongtheeraparp, P, Wiriyachitra, W C, Taylor   +3 more
openaire   +2 more sources

Antioxidant Xanthones from Garcinia vieillardii

Journal of Natural Products, 2004
Two new xanthones, 6-O-methyl-2-deprenylrheediaxanthone B (1) and vieillardixanthone (2), were isolated from the stem bark of Garcinia vieillardii, as were four known compounds (4-7). The structures of 1 and 2 were determined by means of spectroscopic analysis and chemical derivatization.
Hay, Anne-Emmanuelle, Aumond, Marie-Christine, Mallet, Sabine, Dumontet, Vincent, Litaudon, Marc, Rondeau, David, Richomme, Pascal, Hay, Anne-Emmanuelle   +7 more
openaire   +3 more sources

Cytotoxic xanthones from Garcinia hanburyi

Phytochemistry, 1996
Eleven novel cytotoxic xanthones, gambogin, morellin dimethyl acetal, isomoreollin B, moreollic acid, gambogenic acid, gambogenin, isogambogenin, desoxygambogenin, gambogenin dimethyl acetal, gambogellic acid and hanburin were isolated together with four known xanthones, gambogic acid, isomorellin, morellic acid and desoxymorellin, from the dry latex ...
J, Asano, K, Chiba, M, Tada, T, Yoshii
openaire   +2 more sources

Xanthones from Garcinia cowa Roxb. latex

Phytochemistry, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
W, Mahabusarakam, P, Chairerk, W C, Taylor   +2 more
openaire   +2 more sources

Xanthone derivatives from Cratoxylum cochinchinense roots

Phytochemistry, 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.
W, Mahabusarakam, W, Nuangnaowarat, W C, Taylor   +2 more
openaire   +2 more sources