Reactions of Quinoxalinecarboxylic Acids

Quinoxalinecarboxylic acids undergo several useful reactions, illustrated in the following classified examples. [Pg.322]

3-Anilino-2-quinoxalinecarboxylic acid (28, R = NHPh) gave 2-anilinoquinoxa-line (29, R = NHPh) (neat, 200°C, 30 min 72%) ° 2-(2,4-dichloroanilino)-quinoxaline was made similarly (180°C, 30 min 86%). ° [Pg.322]

3-Phenoxy-2-quinoxalinecarboxylic acid (28, R=OPh) gave 2-phenoxyqui-noxaline (29, R = OPh) [polyphosphoric acid (from P2O5 + 85% H3PO4), xylene, 90°C, 5 h 72%]. ° [Pg.322]

2-Quinoxalinecarboxylic acid 1,4-dioxide (30, R = C02H) gave quinoxaline 1,4-dioxide (30, R = H) (PrOH, reflux, 7 h 47%). [Pg.322]

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