反应详情

温度

90 °C

A mixture of 3-acetyl-8-bromoquinolin-4(1H)-one (5.35 g, 20.11 mmol) and K2CO3 (9.17 g, 66.3 mmol) in dry N,N-dimethylformamide (100 mL) was heated at 90° C. for 30 min. After cooling to room temperature, iodomethane (3.77 mL, 60.3 mmol) was added and the mixture was stirred again at 90° C. for 2 h. Then the reaction mixture was concentrated and diluted with water (50 mL), extracted with dichloromethane (4×50 mL), dried over sodium sulfate and absorbed onto silica gel. Purification by automatic silica gel column chromatography (Combiflash RF) eluting with ethyl acetate/hexanes (10-100%) afforded 3-acetyl-8-bromo-1-methylquinolin-4(1H)-one (3.4 g, 12.14 mmol, 60.4% yield) as a brown solid. LCMS: (M+H)+: 279.9.

1. temperatureAfter cooling to room temperature
2. concentrationThen the reaction mixture was concentrated
3. additiondiluted with water (50 mL)
4. extractionextracted with dichloromethane (4×50 mL)
5. dry with materialdried over sodium sulfate
6. customabsorbed onto silica gel
7. customPurification by automatic silica gel column chromatography (Combiflash RF)
8. washeluting with ethyl acetate/hexanes (10-100%)