反应详情

温度

40 °C

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer was charged with acetonitrile (30 mL), (3-nitro-1H-pyrazol-5-yl)methanol (1.43 g, 10.0 mmol), Cs2CO3 (490 mg, 1.5 mmol), and ethyl 2-bromoacetate (2.00 g, 12 mmol). The mixture was stirred at 40° C. for 5 h. It was then cooled to room temperature and filtered. The filtrate was concentrated under reduced pressure and the residue was purified by silica-gel column chromatography eluting with 30:1 dichloromethane/methanol to afford 313a (1.65 g, 72%) as a yellow solid. MS-ESI: [M+H]+ 229.9

1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer
2. temperatureIt was then cooled to room temperature
3. filtrationfiltered
4. concentrationThe filtrate was concentrated under reduced pressure
5. customthe residue was purified by silica-gel column chromatography
6. washeluting with 30:1 dichloromethane/methanol