Topic
Xanthone
About: Xanthone is a research topic. Over the lifetime, 1639 publications have been published within this topic receiving 25870 citations. The topic is also known as: 9-oxo-xanthene & Diphenyline ketone oxide.
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TL;DR: In this paper, high-speed counter-current chromatography (HSCCC) was successfully applied to the isolation and purification of four xanthone glycosides from Halenia elliptica, a plant widely used in traditional Tibetan medicine.
Abstract: High-speed counter-current chromatography (HSCCC) was successfully applied to the isolation and purification of four xanthone glycosides from Halenia elliptica, a plant widely used in traditional Tibetan medicine. The introduction of HSCCC greatly improved the efficiency of compounds preparation from Halenia elliptica. The following were obtained from 100 mg of crude sample in one-step separation: 2.5 mg of 1-O-primeverosyl-2,3,4,5,7-pentamethoxyxanthone, 7.0 mg of 1-O-primeverosyl-2,3,4,7- tetramethoxyxanthone, 10.0 mg of 1-O-primeverosyl-2,3,5-trimethoxyxanthone (demethyoxyhaleniaside), and 8.5 mg of 1-O-primeverosyl-2,3,4,5-tetramethoxyxanthone. HPLC analysis showed that each target compound had a purity of over 98%, and UV, H-1 NMR, and C-13 NMR data confirmed the component chemical structures.
5 citations
Journal Article•
TL;DR: In this article, 13 compounds were isolated from E brevicornum Maxim with column chromatography and identified on the basis of spectral analysis, including Icariin, Icariside, 1, 3, 5, 8-tetrahydroxy xanthone, p-methoxyphenol, behenic acid, β-Sitosterol and daucosterol.
Abstract: Objective Studies on chemical constituents of E brevicornum Maxim Method Compounds were isolated from E brevicornum Maxim with column Chromatography and identified on the basis of spectral analysis Result Thirteen compounds were isolated from E brevicornum Maxim These compounds were : Icariin, Icariside Ⅰ , Icariside Ⅱ , Epimedin A, Epimedin B, Epimedin C, Icaritin-3-O-D-rhamnoside, 1, 3 , 5 , 8-tetrahydroxy xanthone , 1-hydroxy-3, 4 , 5-trimethoxy xanthone , p-methoxyphenol, behenic acid ,β-Sitosterol, daucosterol Conclusion Among them, Epimedin A, Epimedin B, Icaritin-3-O-D-rhamnoside, 1, 3, 5, 8-tetrahydroxy xanthone, 1-hydroxy-3, 5, 8-trimethoxy xanthone, p-methoxyphenol, behenic acid, were isolated from E brevicornum Maxim for the fist time
5 citations
TL;DR: In this article, the reaction of l,3-dihydroxy-6-methoxy- and 1,3,6-trihydroxy-xanthone with 1-bromo3-methylbut-2-ene in presence of methanolic sodium methoxide, to give corresponding 3-methyl but-2enylated xanthones, is described.
5 citations
TL;DR: The incorporation of synthetic deuterium-labeled moniliphenone into chloromonilicin and into its xanthone precursor, 4-chloropinselin, was confirmed by ’H-NMR spectrometry.
Abstract: The biosynthetic route for chloromonilicin, an antifungal substance from cherry rot fungus, was investigated using deuterium-labeled precursors. The incorporation of synthetic deuterium-labeled moniliphenone into chloromonilicin and into its xanthone precursor, 4-chloropinselin, was confirmed by ’H-NMR spectrometry.
5 citations
TL;DR: In this paper, the α-mangostin and related derivatives with electrolysis or active species electrochemically generated in situ from iodobenzene were performed, resulting in dienone-type products, 5, 5a, 5c, and 5c.
Abstract: Oxidation of α-mangostin 1, γ-mangostin 2, and related derivatives with electrolysis or active species electrochemically generated in situ from iodobenzene was performed. γ-Mangostin 2 and its derivatives provided the dienone-type products, 5, 5a–5c, although 1 and its derivatives gave a complex mixtures. The methoxy derivative 6 was obtained by oxidation of 1 using the iodobenzene-derived active species. In contrast to these oxidations, reactions of 1 and 2 with [bis(trifluoroacetoxy)iodobenzene] (PIFA) provided complex mixtures.
5 citations