Tetrahedron Letters p. 7583 - 7586 (1995)
Update date:2022-07-29
Topics:
Zhou, Zhang-Lin
Weber, Eckard
Keana, John F. W.
Treatment of 6,7-dialkoxy-1,4-dihydroquinoxaline-2,3-diones 3 with fuming nitric acid in acetic acid at 25°C resulted in an acetoxylation reaction, giving 5-acetoxy-6,7-dialkoxy-1,4-dihydroquinoxaline-2,3-diones 4 in moderate yields. A mechanism involving ipso attack of nitronium ion as the first step is proposed.
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