Triethylsilane → 4-Benzyl-5-(3,5-dichlorophenyl)sulfanyl-3-methyl-1-phenyl-pyrazole

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Reaction Steps

A solution containing 80 mg of [5-(3,5-dichlorophenylthio)-3-methyl-1-phenyl-1H-pyrazol-4-yl]-phenyl-methanol and 64 μl of triethylsilane in 2 ml of trifluoroacetic acid was stirred at rt for 15 h. The mixture was concentrated, diluted with 10 ml of saturated sodium hydrogen carbonate solution and extracted twice with 10 ml of dichloromethane. Combined extracts were dried over magnesium sulphate, filtered and evaporated. The residue was purified by flash chromatography on silica gel using ethyl acetate/petroleum spirit 40°-60° C. (1:10) for the elution to give 60 mg of 4-benzyl-5-(3,5-dichlorophenylthio)-3-methyl-1-phenyl-1H-pyrazole as a colourless gum. Mass spectrum (El) m/z 424 [M]+. 1H NMR (DMSO-d6) 2.26 (s, 3H), 3.88 (s, 2H), 6.77 (d, 2H), 7.13 (m, 3H), 7.20 (m, 2H), 7.32 (t, 1H), 7.35-7.48 (m, 5H).

Provenance & Evidence