Hydrochloric Acid → HCID 86602665, compound

Participants

Reaction Steps

To a 50 mL flask containing ethyl 1-(3-chloro-2-pyridinyl)-3-(2-propynyloxy)-1H-pyrazole-5-carboxylate (i.e. the product of Step A) (0.45 g, 1.5 mmol) and 10 mL of methanol was added dropwise a mixture of 50% sodium hydroxide (0.7 g, 8.75 mmol) in water (4.0 mL). The mixture was heated to near reflux and then cooled to ambient temperature with stirring continued for 15 minutes. To this mixture was added a solution of 1 N HCl (9.0 mL) and the reaction mixture was concentrated on rotary evaporator to approximately 5 mL to precipitate a solid. The product was isolated via filtration, washed with water, and then air-dried on the filter to afford 0.31 g of the title compound as a white solid.

Provenance & Evidence