Journal ArticleDOI
Benzopyrans. Part 30. Synthesis of substituted xanthones from 3-acyl-2-methyl-1-benzopyran-4-ones
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TLDR
The xanthone as mentioned in this paper was derived from the base catalysed self-condensation of the chromone and showed that it can be obtained by refluxing with NaOMe in MeOH.About:
This article is published in Tetrahedron.The article was published on 1993-05-07. It has received 19 citations till now. The article focuses on the topics: Chromone & Pyran.read more
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Journal ArticleDOI
13 C NMR spectroscopy of substituted xanthones—II
A.W. Frahm,R.K. Chaudhuri +1 more
TL;DR: In this paper, the 13 C NMR chemical shifts of eleven hydroxy-, two hydroxymethoxy xanthones, and xanthone- C -glucoside, mangiferin, are presented and analyzed.
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Cycloadditions of substituted benzopyran-4-ones to electron-rich dienes: a new route to xanthone derivatives
TL;DR: The benzopyranones 1 and 3 reacted with 2,3-dimethyl-1,3butadiene in the presence of titanium (IV) chloride to give the corresponding (4 + 2) cycloadducts 8 and 11, the former undergoing facile deformylation to give 9 and 10.
Journal ArticleDOI
3‐Acylchromone. XV. Mitt. über Untersuchungen an γ‐Pyronen
Fritz Eiden,H. Haverland +1 more
TL;DR: In 2-Stellung unsubstituierte 3-Acyl-chromone wurden aus 2-Hydroxy-ω-acyl-acetophenonen durch Reaktion with Orthoameisensaure-triathylester und Acetanhydrid oder aus 1-hydroxy-α-formylacetophenon and Acetanehydrid/Natriumacetat dargestellt as mentioned in this paper.
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Synthese und Reaktionen von 3‐Acyl‐2‐methylthio‐chromonen1)
Fritz Eiden,Gerd Rademacher +1 more
TL;DR: In this article, the 3-cyl-2-methylthio-chromone was shown to react with hydroxide or alkoxide ions or with amines to yield the substituted 3-acyl-4-hydroxycoumarins.
Journal ArticleDOI
Xanthone aus Chromon‐Derivaten
TL;DR: The 3-acyl-2-(methylthio)chromones 2a-2c and the 6-acetyl-7-methylthIO-furochromone 10 react with the CH-acidic compounds 5a-5f, 11 and potassium tert.-butylate to yield the 3acylchromones 4a-4d and 9, the xanthones 1 and 6a-6d and the furoxanthones 13a-13c and 20.