Journal ArticleDOI
Benzopyrans. Part 30. Synthesis of substituted xanthones from 3-acyl-2-methyl-1-benzopyran-4-ones
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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
Benzopyrans - XXXIII. [4+2]Cycloaddition of N,N-dimethylhydrazones and anils of 2-unsubstituted and 2-methyl-4-oxo-4H-1-benzopyran-3-carboxaldehyde with N-phenylmaleimide
TL;DR: The chromone derivatives 1, 2, and 4 give with N -phenylmaleimide the cycloadducts 5, 12, and 13 which are converted by palladised charcoal into 2-azaxanthone 6, xanthones 14 and 15, respectively as mentioned in this paper.
Journal ArticleDOI
Unusual transformation of substituted-3-formylchromones to pyrimidine analogues: synthesis and antimicrobial activities of 5-(o-hydroxyaroyl)pyrimidines.
TL;DR: Antimicrobial activities of all the synthesized compounds (6a-e) were evaluated against various fungal and bacterial strains and Cytotoxic profile of compound 6d against HeLa cells indicates that at concentration (20 μM) no significant cell death was observed.
Journal ArticleDOI
Benzopyrans. Part 451. Reactions of Monobrominated 3-Acetyl-2-Methyl-1-Benzopyran-4-One with Some Binucleophiles
TL;DR: The chromone 5, obtained by bromination of 3-acetyl-2-methylchromone (3), gives [1]benzoxepino[4,3-d]isoxazole (10) with hydroxylamine and phen... as mentioned in this paper.
Journal ArticleDOI
Benzopyrans. Part 30. Synthesis of Substituted Xanthones from 3‐Acyl‐2‐ methyl‐1‐benzopyran‐4‐ones.
TL;DR: In this article, the xanthone was obtained from the base catalysed self-condensation of the chromone by refluxing with NaOMe in MeOH, and the pyran was derived from the reaction of ω-acetyl-2-hydroxyacetophenone with HC(OEt) 3 -Ac 2 O.
References
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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.
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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.