Sodium hydride → (1-(2-(isopropoxy)ethyl)-1H-benzimidazol-2-yl)(1-(t-butoxycarbonyl)piperidin-4-yl)amine

HRID 323474Notes

Reaction equation

[NH:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[NH:10][CH:11]1[CH2:16][CH2:15][N:14]([C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[CH2:13][CH2:12]1.[H-].[Na+].S(O[CH2:31][CH2:32][O:33][CH:34]([CH3:36])[CH3:35])(=O)(=O)C>CN(C)C=O>[CH:34]([O:33][CH2:32][CH2:31][N:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[NH:10][CH:11]1[CH2:16][CH2:15][N:14]([C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[CH2:13][CH2:12]1)([CH3:36])[CH3:35]

Participants

Conditions

Temperature: 80 °C

Procedure

Combine (1H-benzimidazol-2-yl)(1-(t-butoxycarbonyl)piperidin-4-yl)amine (2.76 g, 8.72 mmol), and sodium hydride (0.38 g, 9.5 mmol) in dimethylformamide (30 mL). After 30 minutes, add 2-(isopropoxy)ethyl mesylate (0.51 g, 5.5 mmol). Heat to 80° C. After 2.5 hours, cool the reaction mixture to ambient temperature and partition between dichloromethane and a saturated aqueous sodium bicarbonate solution. Separate the layers and extract the organic layer with water and then brine. Dry the organic layer over MgSO4, filter, and evaporate in vacuo to give (1-(2-(isopropoxy)ethyl)-1H-benzimidazol-2-yl)(1-(t-butoxycarbonyl)piperidin-4-yl)amine: Rf=0.73 (silica gel, dichloromethane/methanol/concentrated ammonium hydroxide, 90/10/0.1).

Workup

waitAfter 2.5 hours
temperaturecool the reaction mixture to ambient temperature
custompartition between dichloromethane
customSeparate the layers
extractionextract the organic layer with water
dry with materialDry the organic layer over MgSO4
filtrationfilter
customevaporate in vacuo

Sources & evidence

ORD record: ord-f9eb27cac30d489b8aaebfd70ba6de90
Source dataset: uspto-grants-2001_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06211199B1

Reaction notes

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