反应详情

温度

100 °C

To a stirred solution of 100 mg (0.42 mmol) (7-amino-4-methoxy-benzooxazol-2-yl)-carbamic acid methyl ester in 15 ml dioxane and 5 ml ethylene glycol was added 15 ml of a 5 N aq. sodium hydroxide solution and the mixture was heated at 100° C. for 4 h. After cooling to room temperature the mixture was poured onto water and extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulphate and concentrated in vacuo. Flash chromatography (5/95 methanol/dichloromethane, then 10/89/1 methanol/dichloromethane/triethylamine) followed by trituration in ether afforded 15 mg (20%) 4-methoxy-benzooxazole-2,7-diamine as a brown solid. ES-MS m/e (%): 180 (M+H+, 100).

1. temperatureAfter cooling to room temperature the mixture
2. additionwas poured onto water
3. extractionextracted three times with ethyl acetate
4. dry with materialThe combined organic phases were dried over sodium sulphate
5. concentrationconcentrated in vacuo