反应详情

温度

0 °C

To a solution of 3,5-dichlorophenol (10.0 g, 61.3 mmol) in DMF (120 mL) at 0° C. was added 9.19 g (135 mmol) of imidazole and the dark yellow solution was allowed to stir at 0° C. for 10 min. To this was added TBDMS-Cl (10.18 g, 67.5 mmol) and the solution went from pale yellow to clear in 1 min. The solution was allowed to stir from 0° C. to ambient temperature over 18 h. The mixture was cooled to 0° C. then water (120 mL) was added and stirred for 10 min. The mixture was extracted with EtOAc, washed with water, brine, and dried with Na2SO4. The solvent was removed under reduced pressure and the residue was purified on silica gel using EtOAc/heptane (0 to 1:9) as eluent to give 4-(tert-butyldimethylsilanyloxy)-2,6-dichlorobenzaldehyde as a clear liquid. 1H NMR (DMSO-d6, 400 MHz): δ 6.99 (t, J=1.83 Hz, 1H), 6.70 (d, J=1.89 Hz, 2H), 0.73 (s, 9H), 0.00 (s, 6H).

1. customclear in 1 min
2. stirringto stir from 0° C. to ambient temperature over 18 h
3. temperatureThe mixture was cooled to 0° C.
4. stirringstirred for 10 min
5. extractionThe mixture was extracted with EtOAc
6. washwashed with water, brine
7. dry with materialdried with Na2SO4
8. customThe solvent was removed under reduced pressure
9. customthe residue was purified on silica gel