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- W2080294150 abstract "Benzofuroxan (1a) und Acetessigsäureäthylester (3a) reagieren basenkatalysiert zu 3-Methyl-2-chinoxalincarbonsäureäthylester-1.4-dioxid (4a) und/oder 1-Hydroxy-2-benzimidazolcarbonsäureäthylester (5a). Mit 5.6-Methylendioxy-benzofuroxan (1b) erhält man analog die Chinoxalin-1.4-dioxide 4b und 6a, aus 1b und Butyrylessigsäureäthylester (3b) entsprechend 4c und 6b. — Unsymmetrisch substituierte Benzofuroxane (8a–f) reagieren mit 3a zu den 6- und/oder 7-substituierten Chinoxalin-1.4-dioxiden 9a–d und 10a–j. Diese werden mit Acetanhydrid Eisessig zu Chinoxalin-1-oxiden (11a–c und 12c–g) umgelagert. Reactions of Benzofuroxans with Esters of β-Ketoacids Benzofuroxan (1a) and ethyl acetoacetate (3a) react in presence of a basic catalyst to give ethyl 3-methyl-2-quinoxalinecarboxylate-1,4-dioxide (4a) and/or ethyl 1-hydroxy-2-benzimidazolecarboxylate (5a). Analogously from 5,6-methylenedioxyfuroxan (1b) and 3a, the quinoxaline dioxides 4b and 6a are obtained, and from 1b and butyrylethylacetate (3b), the compounds 4c and 6b. Unsymmetrically substituted benzofuroxans (8a–f) yield with 3b the quinoxaline 1,4-dioxides 9a–d and 10a–j, substituted in the 6- and/or 7-position. These rearrange in acetic anhydride/acetic acid to give quinoxaline-1-oxides (11a–c and 12c–g)." @default.
- W2080294150 created "2016-06-24" @default.
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- W2080294150 date "1972-04-11" @default.
- W2080294150 modified "2023-09-23" @default.
- W2080294150 title "Umsetzung von Benzofuroxanen mit β-Ketosäureestern" @default.
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- W2080294150 doi "https://doi.org/10.1002/jlac.19727560114" @default.
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