Journal ArticleDOI
Clathraxanthone, a 1,2,7-trioxygenated xanthone from Haploclathra paniculata
TLDR
A new xanthone was isolated from the trunk wood of Haploclathra paniculata and its structure determined by spectroscopic methods as 2,7-dihydroxy-1methoxyxanthone as mentioned in this paper.About:
This article is published in Phytochemistry.The article was published on 1992-08-01. It has received 3 citations till now. The article focuses on the topics: Xanthone.read more
Citations
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Journal ArticleDOI
Tetraoxygenated naturally occurring xanthones
Valdir Peres,Tanus Jorge Nagem +1 more
TL;DR: This review, with 350 references, gives information on the chemical study of 234 naturally occurring tetraoxygenated xanthones in 12 families, 53 genus and 182 species of higher plants, and two which are described as fungal and lichen metabolites.
Journal ArticleDOI
Xanthones from the stems of Securidaca inappendiculata
TL;DR: From the stems of Securidaca inappendiculata, securixanthones A and B along with ten known xanthones were isolated and their structures were elucidated by analysis chemical and spectroscopic evidence and the chemotaxonomic significance of these findings are discussed.
Journal ArticleDOI
Anti-diabetic xanthones from the bark of Garcinia xanthochymus.
Chi N. Nguyen,Binh T.D. Trinh,Toan B. Tran,Le-Thu T. Nguyen,Anna K. Jäger,Lien-Hoa D. Nguyen +5 more
TL;DR: An ethyl acetate extract the bark of Garcinia xanthochymus exhibited strong inhibition towards α-glucosidase and PTP1B with IC50 values of 0.3±0.1μg/mL and 2.3µmG/mL, respectively, and two new compounds were discovered, which were determined using spectroscopic methods, mainly 1D and 2D NMR.
References
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Journal ArticleDOI
Methods for the structural investigation of xanthones
TL;DR: In this paper, the Gibbs test was used to determine the hydroxylation pattern of xanthones in the presence of certain additives, such as aluminum chloride and 2,6-dichlorobenzoquinone chloroimide.
Journal ArticleDOI
Quinone and xanthone constituents of kielmeyera rupestris
TL;DR: The compounds 2,6-dimethoxy-1,4-benzoquinone, 2,hydroxy-1-methoxyxanthone, 3-hydroxy -1,2-dimethylenedioxyxanthones, 4-hydoxy-2,3-methylenedioxioxanthone and 5-hydrox- 1,5-dihydroxy-3methoxanthone were isolated from Kielmeyera rupestris AP Duarte as discussed by the authors.
Journal Article
New xanthones from Ectiadiopsis oblongifolia and Securidaca longipedunculata.
Journal ArticleDOI
Xanthone studies. IV. Hydroxyl proton chemical shifts in the structural investigation of xanthones.
Peter Arends,Per Helboe +1 more
Journal ArticleDOI
A 1,3,7,8-tetraoxygenated xanthone from haploclathra paniculata
TL;DR: A new xanthone was isolated from the trunk wood of Haploclathra paniculata and its structure determined by UV, IR, NMR and mass spectrometry as 3,7-dihydroxy-1,8-dimethoxyxanthone.