反应详情

To a solution of the thus obtained 3-benzyloxy-4-(4-ethylbenzyl)-1-isopropyl-5-methyl-1H-pyrazole (160 mg, 0.46 mmol) in methanol (3 mL), 20% palladium hydroxide/carbon (58 mg) was added at room temperature and stirred overnight under a hydrogen atmosphere at room temperature. After filtration to remove the insoluble materials, the solvent was distilled off under reduced pressure to give 4-(4-ethylbenzyl)-3-hydroxy-1-isopropyl-5-methyl-1H-pyrazole (109 mg, 92%) as a colorless powder.

1. filtrationAfter filtration
2. customto remove the insoluble materials
3. distillationthe solvent was distilled off under reduced pressure