Abstract
4-Acetyl- and 4-succinyl-3-(2-aryl-2-oxoethyl)-3,4-dihydroquinoxalin-2(1H)-ones undergo the rearrangement into (Z)-2-(3-arylquinoxalin-2-ylidene)acetic acids accompanied by the elimination of the acyl groups. The nitration of 3-(2-oxo-2-phenylethyl)-3,4-dihydro-quinoxalin-2(1H)-one affords 5-nitro- and 7-nitro-2-carboxymethylidenequinoxalines. The bromination of quinoxalin-2-ones in AcOH gives 3-aryl-2-carboxymethylidenequinoxalines and the corresponding 7-bromo derivatives, with the former products predominating.
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