Allyl bromide → 1-(t-butoxycarbonyl)-4-(1-allyl-1H-benzimidazol-2-yl)[1,4]diazepane
Reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:14][CH2:13][CH2:12][N:11]([C:15]2[NH:19][C:18]3[CH:20]=[CH:21][CH:22]=[CH:23][C:17]=3[N:16]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[H-].[Na+].[CH2:26](Br)[CH:27]=[CH2:28]>CN(C)C=O.C(OCC)(=O)C>[C:1]([O:5][C:6]([N:8]1[CH2:14][CH2:13][CH2:12][N:11]([C:15]2[N:16]([CH2:28][CH:27]=[CH2:26])[C:17]3[CH:23]=[CH:22][CH:21]=[CH:20][C:18]=3[N:19]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 75 °C
Procedure
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). After about 30 minutes, when the gas evolution ceases, add allyl bromide (0.35 mL 4.0 mmol). Heat to 75° C. After 4 hours, dilute with ethyl acetate and extract with a saturated aqueous sodium bicarbonate solution and then brine. Dry the organic layer over MgSO4, filter, and evaporate in vacuo to give 1-t-butoxycarbonyl-4-(1-(allyl)-1H-benzimidazol-2-yl)[1,4]diazepane: Rf =0.83 (silica gel, 10% methanol/dichloromethane/0.1% concentrated aqueous ammonia). Combine 1-t-butoxycarbonyl-4-(1-(allyl)-1H-benzimidazol-2-yl)[1,4]diazepane (0.9 g, 2.5 mmol) and ethanol (10 mL). Add aqueous hydriodic acid (10 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.
Workup
- waitAfter 4 hours
- extractionextract with a saturated aqueous sodium bicarbonate solution
- dry with materialDry the organic layer over MgSO4
- filtrationfilter
- customevaporate in vacuo
Sources & evidence
- ORD record
- ord-0f37e4b34830447f963b0144e2da69ab
- Source dataset
- uspto-grants-1999_08
- Patent number
- US05932571
Reaction notes
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