Potassium Iodide → HCID 86692553, compound

Participants

Reaction Steps

1-(5-Amino-4-methylpyridin-2-yl)-5-methyl-1H-pyrazole-4-carboxylic acid ethyl ester (1.0 g) was suspended in 20% (v/v) sulfuric acid aqueous solution (75 ml), sodium nitrite (318 mg) was added thereto little by little under ice-cooling with stirring, and then stirred for 40 minutes under ice-cooling. Then, potassium iodide (1.27 g) was dissolved in water (12 ml), and the obtained aqueous solution was slowly added dropwise to the reaction solution under ice-cooling with stirring. After the completion of adding dropwise, the solution was stirred for 3 hours under ice-cooling, and then gradually warmed to room temperature. The reaction solution was poured into 10% sodium carbonate aqueous solution, the precipitated solid was collected by filtration, and dissolved in ethyl acetate. The organic layer was sequentially washed with sodium thiosulfate aqueous solution, water, and saturated brine, dried over anhydrous sodium sulfate, and then the solvent was evaporated to give 1-(5-iodo-4-methylpyridin-2-yl)-5-methyl-1H-pyrazole-4-carboxylic acid ethyl ester (1.16 g) as a brown solid.

Provenance & Evidence