Water → 2-[(3-Bromophenyl)sulfonyl]-5-(4-chlorophenyl)-4-[(2S)-3,3,3-trifluoro-2-hydroxypropyl]-2,4-dihydro-3H-1,2,4-triazol-3-one

Participants

Reaction Conditions

Reaction Steps

360 mg (1.17 mmol) of the compound from Example 5A were dissolved in 10 ml of THF and, at 0° C., 94 mg (2.34 mmol) of sodium hydride (60% strength dispersion in mineral oil) were added. After 20 min, 299 mg (1.17 mmol) of 3-bromobenzenesulfonyl chloride were added, and the mixture was stirred at 0° C. for 1 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, then 1:1). This gave 181 mg (27% of theory) of the target compound.

Provenance & Evidence