反应详情

To an oven dried round bottom flask containing 5-tert-Butyl-2-p-tolyl-2H-pyrazole-3-carboxylic acid ethyl ester (0.64 g, 2.2 mmol) was added anhydrous THF (20 mL) followed by the drop wise addition of DIBAL-H (0.96 mL, 4.9 mmol) under nitrogen. After stirring at room temperature for 30 minutes the reaction was diluted with 100 mL diethyl ether and quenched with 5 mL Methanol stirring for an additional 30 minutes at room temperature. The resulting slurry was treated with 5 g MgSO4 and filtered through a pad of diatomaceous earth. The filter cake was washed with 3×75 mL portions of ether and the combined filtrates concentrated under vacuo to afford the desired alcohol as a clear oil (0.515 g, 96%). No further purification was necessary. Expected mass=244. Observed mass=245.

1. customTo an oven dried round bottom flask
2. customquenched with 5 mL Methanol stirring for an additional 30 minutes at room temperature
3. additionThe resulting slurry was treated with 5 g MgSO4
4. filtrationfiltered through a pad of diatomaceous earth
5. washThe filter cake was washed with 3×75 mL portions of ether
6. concentrationthe combined filtrates concentrated under vacuo