methyl 3-chloro-1-(pyridin-3-yl)-1H-pyrazole-5-carboxylate → 3-Chloro-1-(pyridine-3-yl)-1H-pyrazole-5-carboxylic acid hydrochloride

Participants

Reaction Steps

Methyl 3-chloro-1-(pyridin-3-yl)-1H-pyrazole-5-carboxylate (1.5 g, 6.0 mmol) was stirred in concentrated hydrochloric acid (25 mL). The reaction mixture was heated at reflux to afford a yellow solution. After heating overnight a solid had precipitated, and LCMS analysis of the mixture indicated that the reaction was complete. The mixture was allowed to cool to room temperature and dioxane (50 mL) was added. The mixture was concentrated to dryness. acetonitrile (50 mL) was added and the resulting mixture was concentrated. The residue was vacuum dried at 40° C. to afford the desired product as a yellow solid (1.6 g, 97%).

Provenance & Evidence