Pyridine → N-[[[4-[2-chloro-4-(trifluoromethyl)phenoxy]phenyl]amino]thio]-N-ethylmethanesulphonamide

Beteiligte Stoffe

Reaktionsschritte

A solution of 2.6 g of sulphur dichloride in 15 ml of dry diethyl ether was added over 10 minutes to a stirred solution of 3.1 g of N-ethylmethanesulphonamide in 15 ml of the same solvent, keeping the temperature between 10°-15° by means of external cooling. A solution of 2.0 g of dry pyridine in 15 ml of dry diethyl ether was then added over 15 minutes at the same temperature and the reaction mixture was allowed to warm to room temperature over 1 hour. The resulting suspension was added over 5 minutes to a solution of 7.2 g of 4-[2-chloro-4-(trifluoromethyl)phenoxy]aniline (1A) in 75 ml of dry diethyl ether containing 2.0 g of pyridine, keeping the temperature of the mixture between 5°-10° C. After stirring at 10°-15° for 1 hour, the reaction mixture was washed three times with water, the ether layer was separated, dried (MgSO 4), and the solvent was evaporated under reduced pressure. The residue was purified by chromatography on silica gel using diethyl ether as eluent, to give 2, as a buff solid m.p.: 98°-101° C.

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