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温度

0 °C

A solution of ethyl 1-phenyl-5-(phenylamino)-1H-pyrazole-3-carboxylate (345 mg) in tetrahydrofuran (10 mL) was cooled to −78° C., and a 1.5 mol/L solution (3.7 mL) of diisobutylaluminum hydride in toluene was added dropwise. After stirring at 0° C. for 1 hr, the mixture was treated with 1 mol/L hydrochloric acid, and extracted with ethyl acetate. The extract was washed with 1 mol/L hydrochloric acid, water, saturated aqueous sodium hydrogen carbonate solution and saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=2:1→1:2) to give the title compound as a pale-yellow oil (yield 318 mg, yield quantitative).

1. extractionextracted with ethyl acetate
2. washThe extract was washed with 1 mol/L hydrochloric acid, water, saturated aqueous sodium hydrogen carbonate solution and saturated brine
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=2:1→1:2)