反应详情

A mixture of 1-benzyl-3-[(4{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)oxy]-1H-pyrazole-4-carboxamide (0.50 g) and acetic anhydride (20 mL) was heated under reflux for 4 hrs. The reaction mixture was concentrated and ethyl acetate was added to the residue. The ethyl acetate layer was washed successively with saturated aqueous sodium hydrogen carbonate and saturated brine and concentrated to give N-acetyl-1-benzyl-3-[(4{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)oxy]-1H-pyrazole-4-carboxamide as colorless crystals (0.25 g, yield 48%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 193-194° C.

1. temperaturewas heated
2. temperatureunder reflux for 4 hrs
3. concentrationThe reaction mixture was concentrated
4. additionethyl acetate was added to the residue
5. washThe ethyl acetate layer was washed successively with saturated aqueous sodium hydrogen carbonate and saturated brine
6. concentrationconcentrated