Oxalyl chloride → (Pyridin-3-yl)-1H-pyrazole-4-carbonyl chloride hydrochloride

Participants

Reaction Steps

4.00 g (21.15 mmol) of 1-(pyridin-3-yl)-1H-pyrazole-4-carboxylic acid were initially charged in approx. 100 ml of dichloromethane, and admixed with 2 drops of dimethylformamide under argon. 7.783 g (61.32 mmol) of oxalyl chloride were added dropwise and, after the end of the addition, the mixture was stirred at room temperature for 1 hour. The solution was concentrated, and the residue was admixed with approx. 10 ml of toluene and concentrated. This gave a colourless solid which was converted further immediately.

Provenance & Evidence