反应详情

温度

115 °C

To a suspension of 4-hydroxy-1-phenyl-3-(2-phenylbutyryl)-1,8-naphthyridin-2(1H)-one (98 mg, 0.25 mmol) produced in Synthesis Example 39 in DMF (2 mL) was added hydrazine monohydrate (purity of 80%, 40 μL), and the mixture was stirred at 110 to 120° C. for 2 hours. To the reaction solution was added a sodium hydrogencarbonate aqueous solution. The resulting precipitate was separated by filtration and washed with water. The precipitate was recrystallized from ethanol and diisopropyl ether to give 5-phenyl-3-(1-phenylpropyl)-1H-pyrazolo[4,3-c][1,8]naphthyridin-4(5H)-one as a form of crystal (51 mg, yield 53%).

1. customThe resulting precipitate was separated by filtration
2. washwashed with water
3. customThe precipitate was recrystallized from ethanol and diisopropyl ether