反应详情

温度

52.5 °C

In a 10-ml round-bottomed flask, dissolve 100 mg of 4-(3H-imidazo[4,5-c]pyridin-2-yl)-fluoren-9-one, obtained in Example 1, in 3 ml of methanol, then add successively 96 μL of hydrazine hydrate and 57.6 μL of acetic acid, then heat at 50-55° C. for 3 hours. Pour the cooled reaction mixture into 10 ml of water. Filter the precipitate that formed, and dissolve again in a mixture of methanol and dichloromethane. After drying over sodium sulphate then concentrating under reduced pressure, purify the residue by crystallization in a minimum of diethyl ether. In this way we obtain 70 mg of N-[4-(1H-imidazo[4,5-c]pyridin-2-yl)-fluoren-9-ylidene]-hydrazine, as a mixture of the Z and E isomers, in the form of a beige powder with the following characteristics:

1. additionPour
2. filtrationFilter the precipitate
3. customthat formed
4. dry with materialAfter drying over sodium sulphate
5. concentrationthen concentrating under reduced pressure
6. custompurify the residue
7. customby crystallization in a minimum of diethyl ether