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

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A solution containing 2.0 g of (5-chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)-phenyl-methanone, 2.0 g of 3,5-dichlorothiophenol and 1.7 g of potassium carbonate in 50 ml of N,N-dimethylformamide was stirred at 60° C. for 19 h. The mixture was partitioned between 100 ml of water and 100 ml of dichloromethane. The organic layer was dried over magnesium sulphate, filtered and evaporated. The residue was purified by flash chromatography on silica gel using methanol/dichloromethane for the elution to give 2.2 g of [5-(3,5-dichloro-phenylsulfanyl)-3-methyl-1-phenyl-1H-pyrazol-4-yl]-phenyl-methanone as a yellow oil. Mass spectrum (ES) m/z 439 [M+H]+, 480 [M+H+CH3CN]+.

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