Five-membered 2,3-dioxo heterocycles: LII. Reactions of 5-aryl-4-(quinoxalin-2-yl)-2,3-dihydrofuran-2,3-diones with Schiff bases and dicyclohexylcarbodiimide. Crystalline and molecular structure of substituted 2-(4-oxo-3,4-dihydro-2H1,3-oxazin-5-yl)quinoxalines

Author： Lisovenko N.   Maslivets A.   Aliev Z.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1070-4280

Source： Russian Journal of Organic Chemistry, Vol.43, Iss.1, 2007-01, pp. : 117-120

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Abstract

Aroyl(quinoxalinyl)ketenes generated by thermolysis of 5-aryl-4-(quinoxalin-2-yl)-2,3-dihydrofuran-2,3-diones react with N-benzylideneanilines and N,N’-dicyclohexylcarbodiimide according to the [4+2]-cycloaddition pattern where the aroylketene acts as diene, and C=N component, as dienophile, to give 3-aryl-2-(2,3,6-triaryl- and 6-aryl-3-cyclohexyl-2-cyclohexylimino-4-oxo-3,4-dihydro-2H-1,3-oxazin-5-yl)quinoxalines. The structure of two cycloaddition products was proved by X-ray analysis.

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