Trifluoroacetic acid → 2-(2-Fluoroethylthio)-phenylsulfonamide

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Reaction Steps

25 ml of trifluoroacetic acid are added at a temperature of 0° C. to a solution of 3.88 g of 2-(2-fluoroethylthio)-N-tert.-butylphenylsulfonamide, obtained in accordance with Example P1, in 25 ml of trichloromethane. After stirring for 18 hours at a temperature of +25° C., the resulting brown reaction mixture is lyophilised. After chromatographic purification of the oily residue with 1) ethyl acetate/petroleum ether (1:1) over silica gel and 2) dichloromethane/acetone (9:1) over silica gel, the resulting fractions are concentrated by evaporation to give 1.5 g (60.5% of the theoretical yield) of crystalline 2-(2-fluoroethylthio)-phenylsulfonamide.

Provenance & Evidence