反应详情

To a solution of sodium tert-butoxide dissolved in ethanol (71 mL) was added diethyl oxalate (16.1 g, 110 mmol) followed by the material obtained in Part A (18.8 g, 100 mmol). The reaction was stirred 30 minutes at ambient temperature before cooling to 0° C. and adding acetic acid (100 mL) and propylhydrazine oxalate (16.4 g, 100 mmol). The reaction was allowed to warm to ambient temperature and stirred for 19 hours. The solvent was removed under reduced pressure. The resulting brown oil was purified by automated flash chromatography (AnaLogix, eluting with a gradient of 50-75% ethyl acetate in hexanes) to provide 9.6 g of ethyl 5-(2-hydroxy-2-methylpropyl)-1-propyl-1H-pyrazole-3-carboxylate as a yellow oil.

1. customobtained in Part A (18.8 g, 100 mmol)
2. temperaturebefore cooling to 0° C.
3. temperatureto warm to ambient temperature
4. stirringstirred for 19 hours
5. customThe solvent was removed under reduced pressure
6. customThe resulting brown oil was purified by automated flash chromatography (AnaLogix
7. washeluting with a gradient of 50-75% ethyl acetate in hexanes)