Carbonate Ion → 3-[2-(4-(4-Methylphenylsulfonyl)piperazin-1-yl)ethylmercapto]1,2,4-triazolo(4,3-a)pyridine

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Reaction Steps

30 g of postassium carbonate are added to a solution of 32.7 g of 3-mercapto-1,2,4-triazolo(4,3-a)pyridine in 300 ml of ethanol and the mixture is heated to the reflux temperature. After 15 minutes, a solution of 65.5 g of 1-chloro-2-[4-(4-methylphenylsulfonyl)piperazin-1-yl]ethane in 100 ml of ethanol is added and refluxing is continued for 3 hours. The reaction mixture is then cooled, the mineral substances are filtered off and the filtrate is concentrated in vacuo. The residue is taken up with chloroform, which is washed with water, and the chloroform phase is then extracted with a 0.5N solution of hydrochloric acid. The acidic aqueous phase is then rendered basic in the cold with a 0.5N aqueous solution of sodium hydroxide and then extracted with chloroform. The chloroform phase is washed with water, dried over sodium sulfate and then concentrated in vacuo to give 73 g of 3-[2-(4-(4-methylphenylsulfonyl)piperazin-1-yl)ethylmercapto]1,2,4-triazolo(4,3-a)pyridine in the form of a thick oil, which is used in the crude state for the next step.

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