Journal ArticleDOI
Studies on antianaphylactic agents—III
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By the application of the Vilsmeier-Haack reaction to various o-hydroxyacetophenone derivatives, 4-oxo-4H-1-benzopyran-3-carboxaldehydes were synthesized in one step as discussed by the authors.About:
This article is published in Tetrahedron.The article was published on 1974-01-01. It has received 175 citations till now. The article focuses on the topics: Fragmentation (mass spectrometry) & Mass spectrum.read more
Citations
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Microwave induced abramov reaction of 3-formylchromone with trialkylphosphites
TL;DR: In this article, various dialkyl-1-(chromon-3-yl)-1-hydroxymethylphosphonates have been synthesized by microwave activation under solvent free condition using modified Abramov reaction.
Journal ArticleDOI
An efficient synthesis of 3-hydroxychromone using niobium pentachloride
TL;DR: In this article, a 2-step synthesis of 3-hydroxychromone was described, where commercially available chromone is converted to the corresponding epoxide, which is rearranged with niobium pentachloride to 3hydroxy chromone in 61% overall yield.
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ONE-POT SYNTHESIS OF 3-FORMYLCHROMONES FROM bis-(TRICHLOROMETHYL) CARBONATE/DMF
W. K. Su,Zhenhua Li,Long Zhao +2 more
TL;DR: In this paper, a new Vilsmeier route for one-pot synthesis of 3-formylchromones using a novel Vilsmeyer-type reagent generated in situ from BTC and Dh4F (Scheme I ) was reported.
References
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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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Synthetic analogs of cortical hormones. i. homogentisic acid and ,2,5-trihydroxyacetophenone derivatives from 2,5-diacetoxy--diazoacetophenone
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The reactions of 2,2‐difluoro‐4‐methylnaphtho[l,2‐e]‐1,3,2‐dioxaborin and its [2,1‐e]isomer with N,N‐dimethylformamide
TL;DR: In this paper, the title compounds react with dimethylformamide in acetic anhydride to give dimethylamino-vinyl derivatives which, on treatment with base, yield benzochroman-4-ones.
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Pharmacological actions of baicalin and baicalein
TL;DR: In this paper, Baicalin and Baicalein, components of the drug, were investigated on active anaphylactic reaction in guinea pig, and the results obtained were compared with those of rutin, methylhesperidin and quercetin.