Ethyl chloroformate → 1-(2,6-dichloro-4-trifluoromethylphenyl)-3-cyano-5-[N-ethoxycarbonyl-N-(3-ethylthiopropyl)amino]-4-trifluoromethylsulfonylpyrazole

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Reaction Conditions

Reaction Steps

Sodium hydride (0.032 g, 60%, 0.8 mmol) was added to a solution of 1-(2,6-dichloro-4-trifluoromethylphenyl)-3-cyano-5-(3-ethylthiopropylamino)-4-trifluoromethylsulfonylpyrazole (0.3 g, 0.54 mmol) in tetrahydrofuran 20° C. under nitrogen. The mixture was stirred at 20° C. for one hour then ethyl chloroformate (0.121 g, 1.1 mmol) was added. The mixture was stirred at 20° C. for 5 hours, then poured into saturated ammonium chloride and ethyl acetate. The organic layer was washed with water and brine, dried (sodium sulfate), evaporated to provide and purified by chromatography on silica gel eluting with heptane-ethyl acetate (4:1) to give 1-(2,6-dichloro-4-trifluoromethylphenyl)-3-cyano-5-[N-ethoxycarbonyl-N-(3-ethylthiopropyl)amino]-4-trifluoromethylsulfonylpyrazole as an oil (Compound number 3-14, 0.278 g, 81% yield), 19F: −63.9; −77.9.

Provenance & Evidence