反应详情

A mixture of 0.5 g of 4-(2,4-dichloro-phenyl)-thiazol-2-ylamine hydrobromide with 0.32 g of p-toluenesulfonyl chloride was stirred overnight with 2 ml of pyridine. The resulting, red colored suspension was poured into 30 ml of 1N hydrochloric acid and extracted three times with 40 ml of ethyl acetate each time. The organic extracts were combined, dried with magnesium sulphate and concentrated. The residue was dissolved in a mixture of 20 ml of ethanol and 20 ml of 2N sodium hydroxide solution. After the addition of 0.4 g of active charcoal the mixture was stirred at room temperature for 30 minutes and subsequently the active charcoal was filtered off. 0.50 g of N-[4-(2,4-dichloro-phenyl)-thiazol-2-yl]-4-methyl-benzenesulfonamide separated as colorless crystals upon neutralization with concentrated hydrochloric acid.

1. extractionextracted three times with 40 ml of ethyl acetate each time
2. dry with materialdried with magnesium sulphate
3. concentrationconcentrated
4. dissolutionThe residue was dissolved in a mixture of 20 ml of ethanol and 20 ml of 2N sodium hydroxide solution
5. additionAfter the addition of 0.4 g of active charcoal the mixture
6. filtrationsubsequently the active charcoal was filtered off
7. custom0.50 g of N-[4-(2,4-dichloro-phenyl)-thiazol-2-yl]-4-methyl-benzenesulfonamide separated as colorless crystals upon neutralization with concentrated hydrochloric acid