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温度

0 °C

To a solution of (4-amino-5-chloro-2-methoxyphenyl)methanol (intermediate 38; 1.5 g, 0.008 mol) in dimethylformamide (35 mL) was added imidazole (1.7 g, 0.02 mol). The mixture was cooled to 0° C. and chloro(isopropyl)dimethylsilane (2.5 g, 0.01 mol) was added dropwise. The reaction was stirred overnight at room temperature. The solvent was removed and the crude was partitioned between water and hexane, the organic layer was washed with water, sodium bicarbonate 4% and brine, dried, filtered and evaporated to dryness. The crude obtained was purified by column chromatography with silica gel, eluting with hexane/ethyl acetate (from 8/1 to 4/1). The title compound was obtained as a yellow solid (58%).

1. customThe solvent was removed
2. customthe crude was partitioned between water and hexane
3. washthe organic layer was washed with water, sodium bicarbonate 4% and brine
4. customdried
5. filtrationfiltered
6. customevaporated to dryness
7. customThe crude obtained
8. customwas purified by column chromatography with silica gel
9. washeluting with hexane/ethyl acetate (from 8/1 to 4/1)