Triethylamine → HCID 24785738, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-(2-Chloro-6-fluoro-4-trifluoromethyl-phenyl)-5-methyl-4-trifluoromethanesulfinyl-1H-pyrazole-3-carboxylic acid amide (0.98 g) in dichloromethane (5 mL) was added triethylamine (0.63 g, 6.2 mmol) followed by trifluoroacetic anhydride (0.89 g, 4.2 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 3 h and quenched by addition of water (2.0 mL) at 0° C. The resulting mixture was extracted with dichloromethane after it was warmed to room temperature. The organic layer was dried (Na2SO4) and concentrated under reduced pressure. The residue was purified by column chromatography, elution with heptanes/EtOAc, to provide 1-(2-Chloro-6-fluoro-4-trifluoromethyl-phenyl)-5-methyl-4-trifluoromethanesulfinyl-1H-pyrazole-3-carbonitrile as a white solid (0.85 g, 2.0 mmol, 99% in three steps). 1H NMR (400 MHz, CDCl3) δ ppm 2.45 (s, 3H), 7.55-7.63 (m, 1H), 7.76 (s, 1H). 19F NMR (376 MHz, CDCl3) δ ppm −113.3 (d, J=7.9 Hz, 0.5F), −113.0 (d, J=7.9 Hz, 0.5F), −73.9 (s, 1.5F), −73.8 (s, 1.5F), −63.9 (s, 3F).

Provenance & Evidence