反应详情

温度

80 °C

Combine 1-t-butoxycarbonyl-4-(1H-benzimidazol-2-yl)[1,4]diazepane (0.8 g, 2.5 mmol) in dimethylformamide (10 mL). Add sodium hydride (0.13 g, 60% in oil, 3.25 mmol) portionwise. After about 30 minutes, when the gas evolution ceases, add pentyl bromide (0.34 mL, 2.74 mmol). Heat to 80° C. After 18 hours, cool the reaction mixture and dilute with dichloromethane (150 mL) and extract with brine. Dry the organic layer over MgSO4, filter, and evaporate in vacuo to give 1-t-butoxycarbonyl-4-(1-pentyl-1H-benzimidazol-2-yl)[1,4]diazepane: Rf =0.87 (silica gel, 5% methanol/dichloromethane/0.05% concentrated aqueous ammonia). Combine 1-t-butoxycarbonyl-4-(1-pentyl-1H-benzimidazol-2-yl)[1,4]diazepane (0.7 g, 1.8 mmol) and ethanol (5 mL). Add aqueous hydriodic acid (5 mL, 57%). Heat to reflux. After 1 hour, cool to ambient temperature and dilute with diethyl ether (250 mL) and stir to give a solid. Collect the solid by filtration, rinse with diethyl ether, and dry to give the title compound.

1. waitAfter 18 hours
2. temperaturecool the reaction mixture
3. extractionextract with brine
4. dry with materialDry the organic layer over MgSO4
5. filtrationfilter
6. customevaporate in vacuo