反应详情

Acetic anhydride (1 ml) and triethylamine (0.09 ml, 0.65 mmol) were added to a dichloromethane solution (4 ml) of 5-[3-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)propoxy]-1-methyl-1H-pyrazol-3-yl-amine (0.20 g, 0.54 mmol) and the mixture was stirred at room temperature for 6 hours. An aqueous potassium carbonate solution was added to the reaction solution, which was then extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate and thereafter concentrated under reduced pressure. The residue was purified by basic silica gel column chromatography (n-hexane:ethyl acetate=2:1→0:1). The purified product was concentrated under reduced pressure and the residue was recrystallized from a solvent mixture of ethyl acetate-diisopropylether to obtain N-{5-[3-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)propoxy]-1-methyl-1H-pyrazol-3-yl}acetamide (0.19 g, 89% yield) as white powder.

1. extractionwas then extracted with ethyl acetate
2. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
3. concentrationconcentrated under reduced pressure
4. customThe residue was purified by basic silica gel column chromatography (n-hexane:ethyl acetate=2:1→0:1)
5. concentrationThe purified product was concentrated under reduced pressure
6. customthe residue was recrystallized from a solvent mixture of ethyl acetate-diisopropylether