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
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Synthesis of some new 3-aryl-1-( 4,6-dimethyl-2-pyrimidinyl)-4-formylpyrazoles using vilsmeier haack reaction
TL;DR: In this article, the synthesis of 3-aryl-l-(4,6-dimethyl-2-pyrimidinyl)-4-forrnylpyrazoles has been accomplished by the reaction of 4,6dimethyl 2-pyridinylhydrazones of various acetophenones with Vilsmeier Haack reagent ( POCl3/DMF).
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Reactions of 3-cyanochromones with primary amines: structures of the products
TL;DR: In this paper, 3-cyanochromones with primary aromatic amines in boiling benzene gave mixtures of Z- and E-3-arylamino-2-(2-hydroxyaroyl)acrylonitriles and 2-amino-3-(aryl-iminomethyl)chromones.
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Structural elucidation and 1h-nmr, 13c-nmr, and mass spectroscopic study of novel 4-chloro-3-formyl-2(vinyl-1-ol) quinolines and 3-formyl-4-hydroxy-2-methyl quinolines
TL;DR: The Vilsmeier Haack reaction upon 4-hydroxy-2-methyl quinolines yielded some unprecedented compounds Elucidation of the structure of hitherto unknown novel 4-chloro-3-formyl-2(vinyl-1-ol)quinolines by NMR and Mass Spectroscopic methods is reported.
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Substituted Quinolinones. Part 16. Preparation and reactions of 3-(4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinolin-3-yl)-3-oxopropanoic acid
TL;DR: In this paper, the chemical behavior of β-keto acid towards nitrosation, coupling with a diazonium salt, esterification, condensation with 2,2-diethoxyethanamine, hydrazinolysis, Knoevenagel condensation of isatine, salicylaldehyde, 3-formylquinolones, and 3 -formylchromone, was investigated.
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"Synthesis, Characterization and Biological Screening of Cu (II)-3-Formylchromone Derivative Complex"
TL;DR: In this article, a 3-formyl chromone derivative ligand with the Cu(II) complex was isolated in the solid form using FTIR spectrums, which showed bands for characteristic frequencies at 1604 cm -1 indicates C=O group, belongs to pyrone ring.
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.