反应详情

To a solution of 4′-acetamido-2-hydroxyacetophenone 4 (7.17 g, 39 mmol) in DMF (65 mL), malononitrile (2.84 g, 43 mmol) was added. With cooling in an ice-water bath, diethylamine (6.05 mL 59 mmol) was gradually added within 20 min. The mixture was stirred at room temperature for 2 h and then diluted with ethyl acetate (400 mL). The mixture was washed with brine (3×200 mL), dried over sodium sulfate, and then evaporated in vacuo. Residual material was treated with dichloromethane and n-hexane, concentrated in vacuo, and precipiated in the concentrated mixture. The precipitated material was filtrated and washed with n-hexane to give 5 (7.64 g) as a brown solid. MS(ES) m/e 242 [M+H].

1. temperatureWith cooling in an ice-water bath
2. washThe mixture was washed with brine (3×200 mL)
3. dry with materialdried over sodium sulfate
4. customevaporated in vacuo
5. additionResidual material was treated with dichloromethane and n-hexane
6. concentrationconcentrated in vacuo
7. filtrationThe precipitated material was filtrated
8. washwashed with n-hexane