反应详情

温度

160 °C

To the solution of 131 (3.27, 10 mmol) in anhydrous NMP (3.6 mL) under nitrogen is added urea (1.60 g, 26 mmol). The resulting mixture is heated to 160° C. and stirred for 6 hours. On cooling, the reaction mixture is poured into water (80 mL), pH is adjusted to 7 with hydrochloric acid, and the solution is extracted with dichloromethane (50 ml×4). The organic solution is dried with anhydrous sodium sulfate and concentrated to give the crude product 177 as an oil which is used directly in the next step reaction.

1. temperatureOn cooling
2. extractionthe solution is extracted with dichloromethane (50 ml×4)
3. dry with materialThe organic solution is dried with anhydrous sodium sulfate
4. concentrationconcentrated