Journal ArticleDOI
Electrochemical transformations of 2-hydroxychalcones into flavanoids
Ẑivko Saničanin,Ibro Tabakovic +1 more
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In this article, 2′-hydroxychalcones are cyclized to flavanones, and flavone or flavonol, by electrochemically generated tris-(4bromophenyl)amine cation radical as homogeneous electron-transfer agent.About:
This article is published in Tetrahedron Letters.The article was published on 1986-01-01. It has received 35 citations till now.read more
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Asymmetric Cyclization of 2′‐Hydroxychalcones to Flavanones: Catalysis by Chiral Brønsted Acids and Bases
TL;DR: In this paper, the authors investigated the possibility of using camphorsulfonic acid as chiral Bronsted acid catalysts for asymmetric cyclization of 2-hydroxychalcones to flavanones.
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New synthesis of flavanones catalyzed by l-proline
TL;DR: L-Proline is utilized as an efficient organocatalyst for the synthesis of substituted flavanones and chalcones in good yields as mentioned in this paper, which is proved with a variety of substrates ranging from electron-deficient to electron-rich aryl aldehydes and 2-hydroxyacetophenones.
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Eco-friendly polyethylene glycol promoted Michael addition reactions of α,β-unsaturated carbonyl compounds
TL;DR: In this article, intra-and inter-nucleophilic addition reactions of different α,β-unsaturated carbonyl compounds were found to be highly effective without any additives in PEG-400 as a recyclable reaction medium under neutral conditions.
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Iodine catalyzed one-pot synthesis of flavanone and tetrahydropyrimidine derivatives via Mannich type reaction
TL;DR: In this article, a variety of functionalized flavanone derivatives and tetrahydropyrimidine derivatives were achieved under remarkably mild conditions and the combination of good to excellent yields, a simple work-up, and the high compatibility of functional groups makes this an attractive synthetic approach to access flavanones and tetrahedropyridine derivatives.
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Efficient conversion of 2′-hydroxychalcones into flavanones and flavanols in a water suspension medium
Koichi Tanaka,Teizo Sugino +1 more
TL;DR: Conversion of 2′-hydroxychalcones into flavanones and flavanols was found to proceed very efficiently in a water suspension medium.
References
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Journal ArticleDOI
A New Method of Preparing Flavones
TL;DR: The reaction of the sodium salt of 2′-hydroxychalcones with palladium(II) salt led to the formation of flavones, accompanied by a small amount of flavanones.
Journal ArticleDOI
Study on Oxidation of Chalcones with Lead Tetraacetate and Manganic Acetate
Kazu Kurosawa,Junko Higuchi +1 more
TL;DR: In this article, 2′-hydroxychalcones were oxidized with lead tetraacetate and manganic acetate to give trans- and cis-aurones, together with substituted benzoic acids and cinnamic acid.
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Chalcone dihalides—VII
John A. Donnelly,H.J. Doran +1 more
TL;DR: In this paper, it was shown that the initial function of the nuclear substituent(s) is to sterically prevent deactivation of the carbonyl group by the phenoxide anion.