反应详情

温度

70 °C

4-Nitroimidazole (5.0 g, 44 mol) in DMF:THF (1:1 (v/v), 40 ml) was treated at room temperature with 60% NaH (2.2 g). When hydrogen evolution had ceased, 3-bromopropylphthalimide (11.79 g, 44 mmol) was added, followed by heating at 70° C. overnight. The mixture was cooled, diluted with dichloromethane and carefully quenched with water. At this point the solid product precipitated out to give 2-[3-(4-nitroimidazolyl)propyl]isoindoline-1,3-dione as a white solid, 8.85 g. The solid was refluxed with methanol (60 ml) and anhydrous hydrazine (4 ml) overnight. The mixture was cooled to 4° C., then filtered. The filtrate was concentrated to dryness, then partitioned between dichloromethane and 2.5 M aqueous sodium hydroxide. The organic layer was washed with saturated sodium chloride solution, dried and concentrated in vacuo to give 3-(4-nitroimidazolyl)propylamine as an orange syrup, 2.24 g. The amine, 1.18 g was treated with benzotriazole carboxamidinium 4-methylbenzenesulfonate (2.2 g) and DIEA (1.5 ml) in acetonitrile (8 ml) with shaking at room temperature overnight. Addition of ether gave amino[3-(4-nitroimidazolyl)propyl]carboxamidinium 4-methylbenzenesulfonate as a beige solid.

1. temperatureThe mixture was cooled
2. customcarefully quenched with water
3. customAt this point the solid product precipitated out