Sodium hydride → 2-(4-bromophenyl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazole

HRID 529691Notes

Reaction equation

[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[NH:9][CH:10]=[CH:11][N:12]=2)=[CH:4][CH:3]=1.[H-].[Na+].Cl[CH2:16][O:17][CH2:18][CH2:19][Si:20]([CH3:23])([CH3:22])[CH3:21]>CN(C=O)C>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([C:8]2[N:12]([CH2:16][O:17][CH2:18][CH2:19][Si:20]([CH3:23])([CH3:22])[CH3:21])[CH:11]=[CH:10][N:9]=2)=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of 2-(4-bromophenyl)-1H-imidazole (1 equiv) in DMF (0.47 M) was added sodium hydride (3 equiv, 60% in mineral oil) at 0° C. under nitrogen. After the resulting reaction mixture was stirred at 0° C. for 15 min, (2-(chloromethoxy)-ethyl)trimethylsilane (1.1 equiv) was added. Then the mixture was stirred at room temperature for 3 h and quenched with saturated aqueous ammonium chloride solution. The aqueous layer was extracted with DCM. The combined organic layers were washed with brine, dried over anhydrous sodium sulfate and filtered. Concentration under vacuum gave the crude product, which was purified by silica gel column chromatography (25% ethyl acetate in petroleum ether) to afford the title compound (80% yield). MS (ESI) m/z 354.2 [M+1]+.

Workup

customAfter the resulting reaction mixture
stirringThen the mixture was stirred at room temperature for 3 h
customquenched with saturated aqueous ammonium chloride solution
extractionThe aqueous layer was extracted with DCM
washThe combined organic layers were washed with brine
dry with materialdried over anhydrous sodium sulfate
filtrationfiltered
concentrationConcentration under vacuum
customgave the crude product, which
customwas purified by silica gel column chromatography (25% ethyl acetate in petroleum ether)

Sources & evidence

ORD record: ord-511b9c38cd0d4265b48b1393e6d5abb9
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09346812B2

Reaction notes

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