反应详情

温度

25 °C

An adaptation of the method of Harsanyi et al., Liebigs Ann. Chem. 190 (1973), was used. A mixture of 3-aminoquinoxalin-2(1H)-one (1) (100 mg, 0.620 mmol) and hydroxylamine hydrochloride (94 mg, 1.3 mmol; Aldrich Co.) in 5 mL of 1-butanol was heated to reflux. The resulting suspension was stirred under reflux for 12 h. The resulting suspension was cool to 25° C. A pale yellow precipitate appeared. The mixture was vacuum filtered and the solid was washed with EtOH (5×2 mL) and dried in vacuum at 60° C. overnight to yield 5 mg (42%) of 3-(hydroxyimino)-1,4-dihydroquinoxalin-2-one as a pale yellow solid mp dec.>330° C. 1H NMR (300 MHz, DMSO-d6) δ 11.156 (br s, 1H, NOH), 10.776 (br s, 1H, NH), 9.878 (br s, 1H, NH), 7.258-6.813 (m, H, H-5+H-6+H-7+H-8). LRMS: 177 (M+, 78%), 161 (100%).

1. temperaturewas heated to reflux
2. temperatureunder reflux for 12 h
3. filtrationfiltered
4. washthe solid was washed with EtOH (5×2 mL)
5. customdried in vacuum at 60° C. overnight