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 article, 13C-NMR spectroscopic analysis of the enriched products demonstrated a labelling pattern indicating that the antibiotic is derived from a polyketide which undergoes rearrangement by a mechanism unique for xanthone biosynthesis.
Abstract: The biosynthesis of citreamicin 1 has been studied by feeding 13C- and 18O-labelled precursors to Micromonospora citrea cultures. 13C-NMR spectroscopic analysis of the enriched products demonstrated a labelling pattern indicating that the antibiotic is derived from a polyketide which undergoes rearrangement by a mechanism unique for xanthone biosynthesis.
12 citations
TL;DR: A new xanthone-O -glycoside isolated from the fern Asplenuim adiantum-nigrum has been identified as 3,7,8- trihydroxyxanthone -1- O -β-laminaribioside by chemical and spectroscopic methods as discussed by the authors.
12 citations
TL;DR: Xanthone, fluorenone, 2-acetylnaphthalene, and acetophenone have been found to photosensitise the decarboxylation of acids of the type RX·CH2·CO2H.
Abstract: Xanthone, fluorenone, 2-acetylnaphthalene, and acetophenone have been found to photosensitise the decarboxylation of acids of the type RX·CH2·CO2H (where X = O, S, or NH). Substituted hydrocarbons (RX·CH3) are formed in the reactions, and their yields are substantialy increased by the inclusion of benzenethiol in the reaction mixture.
12 citations
TL;DR: Two new xanthone derivatives, named schomburgones A and B, along with eight known compounds, including xanthones (3–8) and anthraquinones (9–10) were isolated from the bark of Garcinia schomburgerkiana, and showed good cytotoxicity against five cancer cell lines.
Abstract: Two new xanthone derivatives, named schomburgones A (1) and B (2), along with eight known compounds, including xanthones (3–8) and anthraquinones (9–10) were isolated from the bark of Garcinia schomburgkiana Their structures were determined by spectroscopic analysis especially 1D and 2D NMR spectroscopies All isolated compounds were evaluated for their cytotoxicity against five cancer cell lines (KB, HeLa S-3, HT-29, MCF-7 and HepG-2) Compounds 3–6 and 8 showed good cytotoxicity against all the five cancer cell lines with IC50 values in the range of 145–946 µM
12 citations
TL;DR: A xanthone derivative, 3,6,7-trihydroxy-1-methoxyxanthone has been isolated from the stem bark of Allanblackia monticola and the structure was elucidated by spectroscopic methods.
12 citations