Water → 5-(4-Chlorophenyl)-4-cyclopropyl-2-(1H-1,2,4-triazol-5-ylsulfonyl)-2,4-dihydro-3H-1,2,4-triazol-3-one

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Reaction Steps

300 mg (1.27 mmol) of 5-(4-chlorophenyl)-4-cyclopropyl-2,4-dihydro-3H-1,2,4-triazol-3-one [preparation according to WO 2007/134862 Example 36A] were dissolved in 10 ml of THF, and 143 mg (1.27 mmol) of potassium tert-butoxide were added at −78° C. Over a period of 30 min, the reaction mixture was warmed to RT, and the mixture was stirred at this temperature for a further 20 min. The mixture was then once more cooled to −78° C., and 213 mg (1.27 mmol) of 1H-1,2,4-triazole-5-sulfonyl chloride, dissolved in 5 ml of THF, were added. Over a period of 30 min, the reaction mixture was warmed to RT, and the mixture was stirred at this temperature for a further 20 h. For work-up, 10 ml of water were added. The mixture was extracted twice with in each case 15 ml of ethyl acetate. The combined organic phases were dried over sodium sulfate, filtered and concentrated under reduced pressure. The crude product was purified chromatographically [Method 19]. This gave 136 mg (29% of theory) of the target compound.

Provenance & Evidence