Journal ArticleDOI
Benzopyrans. Part 30. Synthesis of substituted xanthones from 3-acyl-2-methyl-1-benzopyran-4-ones
Reads0
Chats0
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
Citations
More filters
Journal ArticleDOI
Synthesis and cycloadditions of 9H-furo [3,4-b][1]benzo(thio)pyran-9-ones: furan ring formation by a novel hydrolytically induced cycloreversion
G.Elena Daia,Christopher D. Gabbutt,John D. Hepworth,B. Mark Heron,David E. Hibbs,Michael B. Hursthouse +5 more
TL;DR: In this paper, a cycloadditions of cycloads have been investigated for furobenzo(thio)pyrans with aldehydes in the presence of the acetal function.
Journal ArticleDOI
Xanthone in synthesis: a reactivity profile via directed lithiation of its dimethyl ketal
TL;DR: In this article, Xanthone, as its dimethyl ketal, undergoes functionalization with a synthetically useful degree of regioselectivity using a lithiation protocol.
Journal ArticleDOI
A one-step synthesis of 2-Alkyl-5-hydroxychromones and 3-Alkoyl-2-alkyl-5-hydroxychromones.
TL;DR: 2-Alkyl-5-hydroxychromones and 3-alkoyl-2-alkyl-4-oxo-4H-1-benzopyran were prepared in one-step and one pot reaction by condensation of 2',6'-dihydroxyacetophenone with an alkoyl chloride in the presence of K2CO3.
Journal ArticleDOI
Unusual condensation of 2-(2-dimethylaminovinyl)-1-benzopyran-4-one with dimethyl acetylenedicarboxylate: formation of 2,3-bis(methoxycarbonyl)xanthen-9-one
TL;DR: In this article, reaction of dienamine with dimethyl acetylenedicarboxylate and dimethyl maleimide was shown to yield xanthone and chromone, respectively.
Journal ArticleDOI
Six-Membered Ring Systems: With O and/or S Atoms
John D. Hepworth,B. Mark Heron +1 more
TL;DR: In this article, a review of reaction chemistry and new ring synthetic methods for pyranones is presented, which covers work published in the calendar year 2010 and includes new ring synthesis methods for trioxanes, tetraoxane, dioxanes, trithianes and oxathianes.
References
More filters
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.