Water → 2-[(3-Bromophenyl)sulfonyl]-5-(4-chlorophenyl)-4-[(1E)-3,3,3-trifluoroprop-1-en-1-yl]-2,4-dihydro-3H-1,2,4-triazol-3-one

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Reaction Steps

500 mg (1.63 mmol) of the compound from Example 5A were dissolved in 10 ml of acetonitrile, and 449 mg (3.25 mmol) of potassium carbonate and 415 mg (1.63 mmol) of 3-bromobenzenesulfonyl chloride were added. The mixture was heated under reflux for 2 h. For work-up, 10 ml of water were added and 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 by chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate 8:1→5:1→1:1). This gave 285 mg (34% of theory) of the target compound.

Provenance & Evidence