反应详情

温度

20 °C

A mixture of methyl 5-methyl-1-phenethyl-1H-pyrazole-4-carboxylate (177 mg, 0.72 mmol), lithium hydroxide monohydrate (111 mg, 2.62 mmol), tetrahydrofuran (5 mL), methanol (1 mL) and water (1 mL) was stirred at 20° C. for 4 hours. The mixture was acidified to pH=1 with concentrated hydrochloric acid and then extracted with ethyl acetate (15 mL×3). The combined organic phase was dried by sodium sulfate, and then filtered. The filtrate was concentrated in vacuum and separated by HPLC (condition: column AD-H (20 mm*250 mm*5 μm), hexane: ethanol (0.2% DEA)=50:50, flow rate: 13 mL/min) to give 5-methyl-1-phenethyl-1H-pyrazole-4-carboxylic acid (60 mg, 36%). LRMS (M+H+) m/z: calcd. 230.11. found 230.

1. extractionextracted with ethyl acetate (15 mL×3)
2. dry with materialThe combined organic phase was dried by sodium sulfate
3. filtrationfiltered
4. concentrationThe filtrate was concentrated in vacuum
5. customseparated by HPLC (condition: column AD-H (20 mm*250 mm*5 μm), hexane: ethanol (0.2% DEA)=50:50, flow rate: 13 mL/min)