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Reaktionen an Heterocyclen mit 2-Acyl-2-propenon-Teilstruktur, 2. Mitt.1,2) Pyrido[2,3-d]pyrimidine aus 4-Oxo-4H-chromen-3-carboxaldehyden und 4-Aminouracilen

✍ Scribed by Dieter Heber


Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
383 KB
Volume
316
Category
Article
ISSN
0365-6233

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✦ Synopsis


Reactions of Heterocycles

Containing a 2-Acyl-2-propenone Structure, II: Pyrido[2,3-4pyrimidines from 4-0~0-4Schromene-3-carbaldehydes and 4-Aminonraciles Depending on the solvent, 4-0~0-4H-chromene-3-carbaldehydes 1 react with 4-aminouraciles 2,6 and 10 to yield pyrido[2,3-d]pyrimidines of different structures. In dipolar aprotonic solvents the 6H-[l]benzopyrano[3,4-g]pyrido[2,3-d]pyrimidines 4 and 8 are formed. In hot glacial acetic acid the 6-(2-hydroxybenzoyl)pyrido[2,3-d]pyrimidines 5, 9 and 14 are obtained.


πŸ“œ SIMILAR VOLUMES


Reaktionen an Heterocyclen mit 2-Acyl-2-
✍ Dieter Heber πŸ“‚ Article πŸ“… 1987 πŸ› John Wiley and Sons 🌐 English βš– 316 KB πŸ‘ 2 views

Die Reaktionen der 4-Hydroxy-2-oxo-2H-chromen-3-carboxaldehyde 2 mit den Enaminen 3-6 fiihren in Abhangigkeit von der Struktur des Enamins entweder zu den Pyridol3,4-cl-curnarinen 16 oder zu den 3-(2-Hydroxybenzoyl)-2H-pyridonen 20-22