反应详情

1,3-Dichloro-2,4-difluoro-5-iodobenzene (4.0 g) was dissolved in tetrahydrofuran and cooled to −10 degree. A 2.0 M solution of isopropylmagnesium chloride in tetrahydrofuran (10 ml) was added dropwise via a dropping funnel. The reaction mixture was stirred for 1 hour at same temperature. A solution of ethyl trifluoroacetate (2.76 g) in tetrahydrofuran (6 ml) was added dropwise and the reaction mixture was allowed to warm to ambient temperature. The reaction mixture was diluted with t-butyl methyl ether and washed with 1 N NaOH and then brine. The combined extracts were dried over magnesium sulfate. After filtered off, the filtrate was concentrated in vacuo to give crude product which was purified with Kugel-Rohr to give 1-(3,5-dichloro-2,4-difluorophenyl)-2,2,2-trifluoroethanone (2.5 g).

1. temperaturecooled to −10 degree
2. washwashed with 1 N NaOH
3. dry with materialThe combined extracts were dried over magnesium sulfate
4. filtrationAfter filtered off
5. concentrationthe filtrate was concentrated in vacuo
6. customto give crude product which
7. customwas purified with Kugel-Rohr