反应详情

10 g (55.8 mmol) of 4-fluoro-3-trifluoromethylaniline and 6 ml (74.3 mmol) of pyridine are dissolved in 250 ml of dichloromethane. The mixture is cooled with ice water and, under agitation and exclusion of moisture, 12.7 g (57.6 mmol) of 4-chlorosulfonylbenzoic acid is added in incremental portions. The mixture is stirred overnight; the slurry is combined with 75 ml of 2N sodium hydroxide solution, and the organic phase is separated. The alkaline solution is washed with dichloromethane and then adjusted to pH 2 with hydrochloric acid. The product is taken up in ethyl acetate. The solution is washed with water, dried over sodium sulfate and concentrated to dryness. The title compounds melts at 243-°245° C. after crystallization from ethanol.

1. additionis added in incremental portions
2. customthe organic phase is separated
3. washThe alkaline solution is washed with dichloromethane
4. washThe solution is washed with water
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated to dryness
7. customThe title compounds melts at 243-°245° C. after crystallization from ethanol