HCID 14064788, compound → HCID 20222292, compound

Participants

Reaction Steps

A solution of sodium metaperiodate (0.407 g.) in water (15 ml.) was added dropwise to a stirred solution of 4-cyano-3-trifluoromethyl-N-(3-ethylthio-2-hydroxy-2-trifluoromethylpropionyl)aniline (0.6 g.) in methanol (25 ml.) and the mixture was stirred at laboratory temperature for 48 hours and then filtered. The solid was washed with methanol (25 ml.) and the mixture was filtered, and the combined filtrates were evaporated to dryness under reduced pressure. The residue was dissolved in ethyl acetate (150 ml.) and the solution was washed successively with water (15 ml.), saturated aqueous sodium sulphite solution (25 ml.) and saturated aqueous sodium chloride solution (25 ml.), dried over magnesium sulphate and evaporated to dryness under reduced pressure. The residue was chromatographed on silica gel (Merck 7734) using a 1:1 v/v mixture of ethyl acetate and petroleum ether (b.p. 60°-80° C.) as eluant, and the two diastereoisomers of 4-cyano-3-trifluoromethyl-N-(3-ethylsulphinyl-2-hydroxy-2-trifluoromethylpropionyl)aniline were obtained by evaporation of the appropriate fractions of the eluate. These had m.p. 141°-143° C. (more polar isomer) and 160°-162° C. (less polar isomer).

Provenance & Evidence