Ammonium Chloride → HCID 86644482, compound

Participants

Reaction Conditions

Reaction Steps

1.1 g of ethyl 1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylthio)phenyl}-3-{1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy}pyrazole-5-carboxylate was dissolved in 30 mL of toluene, followed by cooling to −78° C., and 2.6 mL of a toluene solution (1.0 mol/L) of diisobutyl aluminum hydride was slowly dropwise added. After stirring for 3 hours, a saturated aqueous solution of ammonium chloride was added, extraction with ethyl acetate was carried out, the organic layer was dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the obtained residue was purified by column chromatography (developing solvent ethyl acetate:hexane=1:3) to obtain 0.95 g of 5-formyl-1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylthio)phenyl}-3-{1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy}pyrazole (1H-NMR (CDCL3/TMS δ (ppm) value) δ: 2.56 (3H, s), 3.39 (2H, q), 6.05 (1H, dt), 6.85 (1H, s), 7.17 (1H, d), 7.66 (1H, d), 9.72 (1H, d)).

Provenance & Evidence