反应详情

4-Nitro-1H-pyrazole (565 mg, 5 mmol) was stirred in acetonitrile (15 mL) with potassium carbonate (829 mg, 6 mmol) for 5 minutes and then 4-methoxybenzyl chloride (861 mg, 0.746 mL, 5.5 mmol) was added. The reaction was stirred at ambient temperature for 18 hours, and then partitioned between ethyl acetate and an aqueous 2M hydrochloric acid solution. The organic layer was separated and the aqueous was extracted with a further portion of ethyl acetate. The combined ethyl acetate layers were dried (Na2SO4) and concentrated in vacuo. The resultant crude product was purified by flash chromatography on SiO2 eluting with 20% ethyl acetate/hexane and then 50% ethyl acetate/dichloromethane to afford the desired title compound as an oil, 1.08 g, 93%.

1. custompartitioned between ethyl acetate
2. customThe organic layer was separated
3. extractionthe aqueous was extracted with a further portion of ethyl acetate
4. dry with materialThe combined ethyl acetate layers were dried (Na2SO4)
5. concentrationconcentrated in vacuo
6. customThe resultant crude product was purified by flash chromatography on SiO2 eluting with 20% ethyl acetate/hexane