Potassium Carbonate → [5-(3,5-dichlorophenylthio)-1-(4-methoxybenzyl)-3-methyl-1H-pyrazol-4-yl]-phenyl-methanone

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A solution containing 170 mg of [5-chloro-1-(4-methoxybenzyl)-3-methyl-1H-pyrazol-4-yl]-phenyl-methanone in 10 ml of N,N-dimethylformamide was treated with 83 mg of potassium carbonate and 107 mg of 3,5-dichlorothiophenol. The mixture was heated at 100° C. for 4 h. The mixture was treated with a further 83 mg of potassium carbonate and 107 mg of 3,5-dichlorothiophenol. The mixture was then heated at 50° C. for 64 h. The mixture was treated with a further 83 mg of potassium carbonate and 107 mg of 3,5-dichlorothiophenol. The mixture was then heated at 100° C. for 2 h. The solvent was removed under reduced pressure and residue partitioned between dichloromethane/water, washed with brine then dried over anhydrous magnesium sulphate, filtered and evaporated. The residue was purified via flash chromatography on silica gel using diethyl ether/petroleum ether (1:4 to 1:3) to give 140 mg of [5-(3,5-dichlorophenylthio)-1-(4-methoxybenzyl)-3-methyl-1H-pyrazol-4-yl]-phenyl-methanone as a colourless oil. Mass spectrum (ES) m/z 483[M+H]+.

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