Hydrochloric Acid → 2,6-Dimethyl-8-(3-methylbutoxy)imidazo[1,2-a]pyridine-3-carboxylic acid

Participants

Reaction Steps

2.25 g (7.4 mmol) of ethyl 2,6-dimethyl-8-(3-methylbutoxy)imidazo[1,2-a]pyridine-3-carboxylate Example 88A were initially charged in 157 ml of THF/methanol (5:1), 37 ml (37 mmol) of 1N aqueous lithium hydroxide solution were added and the reaction mixture was stirred at RT over the weekend. The mixture was then cooled to 0° C., acidified to pH 4 with 6 N aqueous hydrochloric acid and freed from organic solvent on a rotary evaporator. The precipitated solid was filtered off, washed with water and dried under high vacuum. This gave 1.64 g (80% of theory; purity 100%) of the title compound.

Provenance & Evidence