反应详情

温度

25 °C

To a solution of 1-(1-Ethoxyethyl)-4-(4-fluorophenyl)-5-[4-(methyl-thio)phenyl]-1H-imidazole (Example 83 Step 1) (403.8 mg; 1.04 mmol) and TMEDA (582.7 mg; 5.01 mmol) in 6 ml of THF at −78° C. was added 1.23 ml of 2.5 M n-butyllithium in hexanes. After stirring for 15 minutes, a solution of N-methoxy-N-methyltrifluoracetamide, (167 mg; 1.41 mmol) in 1 ml of THF was added. The solution was warmed to 25° C. over one hour. The reaction was diluted with diethyl ether and washed with a saturated, aqueous, solution of sodium bicarbonate. The organic extracts were dried (MgSO4), filtered and evaporated under reduced pressure to give the crude product, which was purified by flash chromatography (SiO2; 25% ethyl acetate/hexane) to give 81 mg of 1-[1-(1-ethoxyethyl)-4-(4-fluorophenyl)-5-[4-(methylthio)phenyl]-1H-imidazol-2-yl]-2,2,2-trifluoroethanone which was used directly in the next step.

1. washwashed with a saturated, aqueous, solution of sodium bicarbonate
2. dry with materialThe organic extracts were dried (MgSO4)
3. filtrationfiltered
4. customevaporated under reduced pressure
5. customto give the crude product, which
6. customwas purified by flash chromatography (SiO2; 25% ethyl acetate/hexane)