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Název: | Reaction of malonates with camphoranile. Synthesis of 4-hydroxy-2-pyridones attached to the Bornane ring system | ||||||||||
Autor: | Kafka, Stanislav; Aigner, R.; Kappe, T. | ||||||||||
Typ dokumentu: | Recenzovaný odborný článek (English) | ||||||||||
Zdrojový dok.: | Journal of Heterocyclic Chemistry. 2006, vol. 43, issue 4, p. 1105-1109 | ||||||||||
ISSN: | 0022-152X (Sherpa/RoMEO, JCR) | ||||||||||
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DOI: | https://doi.org/10.1002/jhet.5570430444 | ||||||||||
Abstrakt: | The reaction of camphoranils N-((1R,4R)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene)benzenamine and N-(1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene)benzenamine with magic malonates (bis(2,4,6-trichlorophenyl) 2-butyl- and 2-phenylmalonates) leads to 4-hydroxy-2(1H)-pyridones attached to bornane ring system (e.g. (5S,8R)-3-butyl-5,6,7,8-tetrahydro-4-hydroxy-8,9,9-trimethyl-1-phenyl-5,8-methanoquinolin-2(1H)-one) in good yields. Less satisfactory yields were obtained with the di-Et 2-phenylmalonate. The reaction of an excess of di-Et malonate with N-(1,7,7-trimethylbicyclo[2.2.1]heptan-2-ylidene)benzenamine yields the pyrono deriv. 4-hydroxy-7,11,11-trimethyl-6-phenyl-7,8,9,10-tetrahydro-7,10-methano-2H-pyrano[3,2-c]quinoline-2,5(6H)-dione, which can readily be degraded via the acetyl deriv. 3-acetyl-4-hydroxy-8,9,9-trimethyl-1-phenyl-5,6,7,8-tetrahydro-5,8-methanoquinolin-2(1H)-one to the basic structure 4-hydroxy-8,9,9-trimethyl-1-phenyl-5,6,7,8-tetrahydro-5,8-methanoquinolin-2(1H)-one. | ||||||||||
Plný text: | http://onlinelibrary.wiley.com/doi/10.1002/jhet.5570430444/abstract | ||||||||||
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