反应详情

Under argon and with stirring, 22.7 ml (22.7 mmol) of a 1 M solution of methylmagnesium bromide in diethyl ether were added dropwise at 0° C. to a solution of 5.22 g (20.6 mmol) of 1-(3-bromophenyl)-2,2,2-trifluoroethanone in 40 ml of anhydrous THF. After the addition had ended, the reaction mixture was stirred at 0° C. for another 30 min. Then—still at 0° C.—excess Grignard reagent was hydrolyzed by careful addition of water. The mixture was then adjusted to a pH of about 5 by addition of 2 M hydrochloric acid. The phases were separated and the aqueous phase was extracted twice with in each case about 20 ml of diethyl ether. The combined organic phases were dried over magnesium sulphate, filtered and evaporated to dryness on a rotary evaporator. This gave 5.32 g (95% of theory) of the title compound.

1. additionAfter the addition
2. stirringthe reaction mixture was stirred at 0° C. for another 30 min
3. customThe phases were separated
4. extractionthe aqueous phase was extracted twice with in each case about 20 ml of diethyl ether
5. dry with materialThe combined organic phases were dried over magnesium sulphate
6. filtrationfiltered
7. customevaporated to dryness on a rotary evaporator