Hydrochloric Acid → HCID 72210863, compound

Participants

Reaction Conditions

Reaction Steps

Sodium methoxide (25 wt % I methanol, 1.1 mL) is added to a stirred solution of 4,6-dichloro-pyridazine-3-carboxylic acid methyl ester (1.03 g, 5 mmol) in THF (25 mL) cooled to 0° C. The reaction mixture is stirred at room temperature overnight and then poured into 1N HCl (8 mL). The resulting solution is then neutralized by saturated NaHCO3. EtOAc (20 mL) is added and the layers are separated. The aqueous layer is extracted twice with EtOAc (20 mL) and the combined extracts are washed with brine (25 mL), dried (Na2SO4) and evaporated. The residue is then purified by flash column chromatography (silica gel, eluted with 2:1 Hexane:EtOAc) to give 6-chloro-4-methoxy-pyridazine-3-carboxylic acid methyl ester as a white solid.

Provenance & Evidence