2,4,6-Trimethylpyridine → 3-(4-chlorophenyl)-4,5-dihydro-4-phenyl-1-[2-((3-(trifluoromethyl)phenyl)sulfonyl)ethyl]-1H-pyrazole

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Reaction Steps

To a stirred mixture of 3-(4-chlorophenyl)-4,5-dihydro-4-phenyl-1H-pyrazole (1.7 gram, 6.60 mmol) and collidine (2 ml) in acetonitrile (25 ml) was slowly added a solution of 2-((3-(trifluoromethyl)phenyl)sulfonyl)ethyl chloride (1.5 gram, 5.50 mmol) in acetonitrile (20 ml) and the resulting solution was heated at reflux temperature for 16 hours. After concentration in vacuo the residue was dissolved in ethylacetate and washed with aqueous sodium hydrogencarbonate solution. The resulting ethylacetate layer was successively washed with 1 N hydrochloric acid solution and aqueous sodium hydrogencarbonate solution. Subsequent flash chromatographic purification (petroleum ether/diethyl ether=1/2 (v/v)) gave an oil which was crystallised from diisopropyl ether to afford 3-(4-chlorophenyl)-4,5-dihydro-4-phenyl-1-[2-((3-(trifluoromethyl)phenyl)sulfonyl)ethyl]-1H-pyrazole (0.52 gram, 19% yield). Melting point: 118-119° C.

Provenance & Evidence