Hydrochloric Acid → 2-(4-Chloro-2-fluoro-5-isopropoxyphenyl)-4-cyano-5-trifluoromethylpyridazin-3-one

Participants

Reaction Conditions

Reaction Steps

After 4.345 g of 3, 3, 3-trifluoro-2-oxopropanal 1-(4-chloro-2-fluoro-5-isopropoxyphenylhydrazone) was dissolved in 20 mL of pyridine, 2.1 mL of ethyl cyanoacetate was added to the pyridine solution, which was followed by stirring for 4 hours at 120° C. After cooling to room temperature, the reaction solution was poured into 3N-hydrochloric acid and extracted with diethyl ether. After the organic layer was washed with aqueous saturated sodium bicarbonate and concentrated, the residue was subjected to silica gel column chromatography (eluent: ethyl acetate/hexane=2/8) to afford 2.858 g of 2-(4-chloro-2-fluoro-5-isopropoxyphenyl)-4-cyano-5-trifluoromethylpyridazin-3-one (The present compound 1-5).

Provenance & Evidence