Hydrochloric Acid → N-[4-(2-fluoro-5-trifluoromethyl-phenyl)-thiazol-2-yl]-4-methoxy-benzenesulfonamide

Beteiligte Stoffe

Reaktionsschritte

A mixture of 0.5 g of 4-(2-fluoro-5-trifluoromethyl-phenyl)-thiazol-2-ylamine hydrobromide with 0.33 g of 4-methoxy-benzenesulfonyl chloride was stirred overnight with 2 ml of pyridine. The resulting, red colored suspension was poured into 30 ml of 1N hydrochloric acid and the mixture was extracted lo with ethyl acetate. The organic phase was dried with magnesium sulphate and concentrated. The residue was dissolved in a mixture of 30 ml of ethanol and 20 ml of 2N sodium hydroxide solution. After the addition of 0.5 g of active charcoal the mixture was stirred at room temperature for 30 minutes and subsequently the active charcoal was filtered off. The product separated upon neutralization with concentrated hydrochloric acid. Recrystallization from 30 ml of 50% ethanol yielded 0.26 g of N-[4-(2-fluoro-5-trifluoromethyl-phenyl)-thiazol-2-yl]-4-methoxy-benzenesulfonamide as colorless crystals.

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