Water → 2-Chloro-5-trifluoromethyl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzoimidazole

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Reaction Steps

A mixture of 2-chloro-5-trifluoromethyl-1H-benzoimidazole (1 g, 4.52 mmol, Example 1c), triethylamine (1.3 mL, 9.04 mmol, Aldrich) and (2-chloromethoxy-ethyl)-trimethyl-silane (881 μL, 4.98 mmol, Aldrich) in dichloromethane (30 mL) was stirred at room temperature for 16 h. Water (150 mL) was added, and the mixture was extracted with dichloromethane (2×150 mL). The combined organic extracts were dried over MgSO4 and filtered. The solvent was removed in vacuo and the residue was purified by silica gel column chromatography, eluting with hexane/EtOAc (10:1) to give the title compound as an orange solid. MS (ESI, positive ion) m/z: 351 (M+1).

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