Hydrochloric Acid → 2-(4-ethoxy-phenyl)-pyrazolo[1,5-b]pyridazine-3-carboxylic Acid

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Reaction Steps

A mixture of 2-(4-ethoxy-phenyl)-pyrazolo[1,5-b]pyridazine-3-carboxylic acid methyl ester (1.2 g), ethanol (10 ml) and 2N sodium hydroxide (10 ml) was heated to 80° for 1.5 h. The mixture was allowed to cool and acidified to pH 1 with 2N hydrochloric acid. The title compound was isolated by filtration as a brown solid (716 mg, 63%).

Provenance & Evidence