Water → 3-{3-Amino-4-[(trifluoromethyl)thio]phenyl}-5,5-dimethylimidazolidine-2,4-dione

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Reaction Conditions

Reaction Steps

To a suspension of 1.75 g of 5,5-dimethyl-3-{3-nitro-4-[(trifluoromethyl)thio]phenyl}imidazolidine-2,4-dione obtained in stage b) below in 60 mL of concentrated hydrochloric acid are added, portionwise, 7.5 g of zinc powder. The reaction mixture is heated at 50° C. for 8 hours and then cooled to room temperature and poured into a mixture of 100 mL of ethyl acetate and 20 mL of water. 5N sodium hydroxide solution is then added to pH 8 and the solid formed is then filtered off through Celite and washed with ethyl acetate. The phases are separated, the aqueous phase is washed with ethyl acetate and the combined organic phases are dried over magnesium sulphate, filtered and concentrated under reduced pressure. The residue is purified by chromatography on a column of silica, eluting with a mixture of dichloromethane and methanol (95/5 by volume) to give 400 mg of 3-{3-amino-4-[(trifluoromethyl)thio]phenyl}-5,5-dimethylimidazolidine-2,4-dione, the characteristics of which are as follows:

Provenance & Evidence