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温度

0 °C

A mixture of 2,5 g (7,1 mmol) 4,5-diethoxalylaminobenzofurazan and 20 ml 1N hydrochloric acid was refluxed for 3 h. After cooling to 0° C., the precipitate was filtered off and washed with water to give 1,4 g (97%) 7,8-dihydroxy-1,2,5-oxadiazolo(3,4-f)quinoxaline, m.p.>300° C. NMR (DMSO-d6): 12,8 (1H, broad s), 12.3 (1H, broad s), 7.70 (1H,d), 7.37 (1H,d).

1. temperaturewas refluxed for 3 h
2. filtrationthe precipitate was filtered off
3. washwashed with water