Hydrochloric Acid → 3-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-3H-imidazo[4,5-b] pyridine-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

175.0 mg (0.46 mmol) 3-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-3H-imidazo[4,5-b]pyridine-2-carboxylic acid methyl ester were added to a solution of 19.6 mg (0.82 mmol) LiOH in 6 mL THF and 2 mL H2O. The reaction mixture was stirred for 2 h at 60° C., cooled to room temperature and acidified (pH=2) by the addition of a half concentrated HCl-solution. The precipitate was filtered off and washed with water to give pure 3-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-3H-imidazo[4,5-b] pyridine-2-carboxylic acid as a brown crystalline solid.

Provenance & Evidence