1980
DOI: 10.1080/00397918008061846
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Oxidation of 4-Oxo-4H-1-Benzopyran-3-Carboxaldehydes with N-Bromosuccinimide

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Cited by 15 publications
(5 citation statements)
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“…The chemical behavior of diaminopyridone 4 was studied toward chromone‐3‐carboxylic acid and chromone‐3‐carbonitrile . Thus, treatment of compound 4 with chromon‐3‐carboxylic acid in POCl 3 produced 7‐(6‐methyl‐4‐oxo‐4 H ‐chromene‐3‐yl)‐2‐(4‐oxo‐4 H ‐chromene‐3‐yl)‐5‐oxo‐3,5‐dihydro‐1,2,4‐triazolo[1,5‐ a ]pyridine‐6,8‐dicarbonitrile ( 24 ) (Scheme ).…”
Section: Resultsmentioning
confidence: 99%
“…The chemical behavior of diaminopyridone 4 was studied toward chromone‐3‐carboxylic acid and chromone‐3‐carbonitrile . Thus, treatment of compound 4 with chromon‐3‐carboxylic acid in POCl 3 produced 7‐(6‐methyl‐4‐oxo‐4 H ‐chromene‐3‐yl)‐2‐(4‐oxo‐4 H ‐chromene‐3‐yl)‐5‐oxo‐3,5‐dihydro‐1,2,4‐triazolo[1,5‐ a ]pyridine‐6,8‐dicarbonitrile ( 24 ) (Scheme ).…”
Section: Resultsmentioning
confidence: 99%
“…Conjugates 7a , 7c , and 7d were prepared via the general procedure adopted from the literature report [ 51 ]. A mixture of 4-oxo-4 H -1-benzopyran-3-yl- carboxaldehyde ( 2a , 0.5 g, 2.9 mmol) or methoxy substituted 4-oxo-4 H -1-benzopyran-3-yl- carboxaldehyde ( 2b / 2c / 2d , 0.59 g, 2.9 mmol), NBS (0.61 g, 3.44 mmol), and AIBN (20 mg) in CCl 4 (25 mL) was taken in a round bottom flask and refluxed for 1 h. The mixture was then cooled in ice-water bath, followed by the addition of 3-amino-5-methyl isoxazole (0.56 g, 5.74 mmol).…”
Section: Methodsmentioning
confidence: 99%
“…Elemental analyses were performed on a PerkinElmer 2400II at the Chemical War Department, Ministry of Defense, Cairo, Egypt. Chromone-3-carboxylic acid (1), 34 3-(3,5-dimethyl-1H -pyrazol-1-yl)-3-oxopropanenitrile (6), 35 and 1,3-diphenyl-1H− pyrazol-5(4H)-one 36 were prepared according to the literature.…”
Section: Resultsmentioning
confidence: 99%