反应详情

To a solution of 2,4-difluoro-1-methoxybenzene (156 mg) in tetrahydrofuran (5 mL) at −78° C. is added a 2M solution of lithium diisopropylamide in THF (540 μL). After stirring for 45 min a solution of 1-(2-trimethylsilylethoxymethyl)-1H-benzimidazole-2-carbaldehyde (which can be prepared according to US2003/220341 or U.S. Pat. No. 6,476,041 for example) (300 mg) in tetrahydrofuran (5 mL) is added at −78° C. and the reaction mixture allowed to warm to room temperature. After hydrolysis with aqueous saturated ammonium chloride and extraction with ethyl acetate, the organic phase is dried over magnesium sulfate and concentrated under reduced pressure. The residue is purified by chromatography over silica gel (gradient dichloromethane/methanol from 100/0 to 95/5) to afford (2,6-difluoro-3-methoxyphenyl)[1-(2-trimethylsilylethoxymethyl)-1H-benzimidazol-2-yl]methanol.

1. customcan be prepared
2. customis added at −78° C.
3. customAfter hydrolysis
4. extractionwith aqueous saturated ammonium chloride and extraction with ethyl acetate
5. dry with materialthe organic phase is dried over magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue is purified by chromatography over silica gel (gradient dichloromethane/methanol from 100/0 to 95/5)