反应详情

温度

145 °C

Fine powdered ammonium sulfate (0.13 g, 1 mmol) was added to a suspension of Z)-2-acetylamino-3-cyclopropylamino-but-2-enoic acid ethyl ester (7.0 g, 20 mmol) and hexamethyldisilazane (50 ml, 235 mmol) and refluxed over night at 145° C. The reaction mixture was evaporated and extracted with ethyl acetate and water. The organic phase was dried over sodium sulfate and evaporated. The crude product was purified by column chromatography on silica gel (ethyl acetate/methanol 4:1) and the desired compound was obtained as a light brown solid (1.3 g, 31%), MS: m/e=209.1 (M+H+).

1. customThe reaction mixture was evaporated
2. extractionextracted with ethyl acetate and water
3. dry with materialThe organic phase was dried over sodium sulfate
4. customevaporated
5. customThe crude product was purified by column chromatography on silica gel (ethyl acetate/methanol 4:1)