Hydrochloric Acid → 1-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-5-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a suspension of 43.6 mg (0.080 mmol) 1-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-5-carboxylic acid methyl ester in 4 mL MeOH 0.4 mL of a 1 M aqueous LiOH-solution were added and the resulting mixture was stirred at 60° C. for 5 h. The mixture was acidified by the addition of a 1 M HCl-solution (pH≈2-3) and concentrated under reduced pressure. Final purification by preparative RP-HPLC (CH3CN/H2O gradient+0.05% formic acid) gave pure 1-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-5-carboxylic acid. The corresponding dihydrochloride was obtained by treatment of the product with a 0.1 M HCl-solution followed by lyophilization. Yield: 43 mg MS (ES+): m/e=528, chloro pattern.

Provenance & Evidence