反应详情

To a stirred mixture of cyanogen bromide (5.3 g, 0.05 mol), K2 CO3 (7.1 g) and dimethylsulfoxide (40 ml) was added, dropwise, 3-(4-methyl-1-piperazinyl)-1H-indazole (1 1.0 g 0.051 mol) dissolved in dimethylsulfoxide (60 ml). The reaction was stirred at ambient temperature for 1 hour, and then it was poured into water. The aqueous suspension was extracted with ethyl acetate, the ethyl acetate was washed (H2O), dried (MgSO4), and concentrated to afford 7.8 g (67%) of a ye llow solid. This sample was combined with another and recrystallized twice from toluene to afford analytically pure 4-(1H-indazol-3-yl)-1-piperazinecarbonitrile as a white solid, m.p.=12°-122° C.

1. additionwas added
2. extractionThe aqueous suspension was extracted with ethyl acetate
3. washthe ethyl acetate was washed (H2O)
4. dry with materialdried (MgSO4)
5. concentrationconcentrated
6. customto afford 7.8 g (67%) of a ye llow solid
7. customrecrystallized twice from toluene