反应详情

To a solution of 4-chloro-2-iodophenol (1.587 g, 6.238 mmol) in dichloromethane (10 ml) was added 1H-imidazole (1.01 g, 14.3 mmol) followed by a solution of tert-butyl(chloro)dimethylsilane (2.63 ml, 13.7 mmol) in dichloromethane (10 ml) dropwise. The resulting white suspension was stirred for 16 hours at room temperature before concentrating in vacuo. The residue was diluted with ethyl acetate (20 ml) and water (20 ml). The aqueous phase was acidified with hydrochloric acid (2 M aqueous solution) and extracted with ethyl acetate. The combined organic layers were washed with hydrochloric acid (2 M aqueous solution), saturated aqueous sodium chloride solution, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified by column chromatography (40 g silica gel column) eluting with ethyl acetate:heptane (gradient 0:1 to 3:7, by volume) to afford the title compound as pale yellow oil, 2.2 g, 95% yield.

1. concentrationbefore concentrating in vacuo
2. additionThe residue was diluted with ethyl acetate (20 ml) and water (20 ml)
3. extractionextracted with ethyl acetate
4. washThe combined organic layers were washed with hydrochloric acid (2 M aqueous solution), saturated aqueous sodium chloride solution
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe residue was purified by column chromatography (40 g silica gel column)
9. washeluting with ethyl acetate