Pyridine → HCID 19783054, compound

Participants

Reaction Steps

A stirred solution of 0.5 gram (0.001 mole) of 5-amino-1-(3-chloro-5-trifluoromethyl-6-phenylmethylaminopyridin-2-yl)-4-cyanopyrazole and 1.0 gram (0.013 mole) of pyridine in 25 mL of methylene chloride was cooled to -10° C. A solution of 1.2 grams (0.013 mole) of propionyl chloride in 10 mL of methylene chloride was added dropwise. After completion of the addition, the reaction mixture was allowed to warm to room temperature and then was heated at reflux for approximately 19 hours. The reaction mixture was cooled and evaporated under reduced pressure, leaving an oil. This oil was partitioned between diethyl ether and water. The organic phase was washed in succession with water, dilute hydrochloric acid, and water. The washed organic phase was evaporated under reduced pressure, leaving a residue. This residue was dissolved in 13 mL of ethanol and 13 mL of water. The resultant mixture was stirred and heated at reflux. Potassium carbonate (0.20 gram, 0.0014 mole) was added, and the mixture was stirred and heated at reflux for approximately 15 minutes. The solvents were removed by distillation under reduced pressure, leaving a waxy solid. This solid was purified by crystallization from ethanol and water to yield 0.51 gram of 1-(3-chloro-5-trifluoromethyl-6-phenylmethylaminopyridin-2-yl)-4-cyano-5-ethylcarbonylaminopyrazole, m.p. 139-142° C. (Compound 53 of Table 1). The nmr spectrum was consistent with the proposed structure.

Provenance & Evidence