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0 °C

Sodium hydride (60% dispersion in mineral oil, 0.212 g, 5.30 mmol) was added in portions to a 0° C. solution of 2,5-dibromo-1H-imidazole (0.600 g, 2.67 mmol) in N,N-dimethylformamide (4 mL), and the resulting mixture stirred for 30 min at 0° C. A solution of 2-(trimethylsilyl)ethoxymethyl chloride (0.665 g, 4.01 mmol) in N,N-dimethylformamide (0.5 mL) was added at 0° C., and the resulting solution stirred for an additional 2.5 h at room temperature. The reaction mixture was poured into ethyl acetate (20 mL), washed with brine (3×5 mL), dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The residue was purified via column chromatography on silica gel (eluting with 10:1, ethyl acetate/petroleum ether) to afford 2,5-dibromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazole (0.390 g, 41%) as light yellow oil. MS (ESI, pos. ion) m/z 357, 355, 359 [M+H]+.

1. stirringthe resulting solution stirred for an additional 2.5 h at room temperature
2. washwashed with brine (3×5 mL)
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under vacuum
6. customThe residue was purified via column chromatography on silica gel (eluting with 10:1, ethyl acetate/petroleum ether)