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30 mg (0.058 mmol) 1-[(5-Chloro-pyridin-2-ylcarbamoyl)-methyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-4-carboxylic acid methyl ester were dissolved in 3 mL dichloromethane and cooled to 0° C. 234 μl of a 1 M BBr3-solution (4 equiv.) in dichloromethane were carefully added and the resulting mixture was stirred at room temperature for 16 h. Under cooling 3 mL water were added dropwise followed by the addition of 0.7 mL of a 1 M NaOH-solution. The mixture was concentrated under reduced pressure. Purification by preparative HPLC (CH3CN/H2O gradient+0.05% formic acid) gave pure 1-[(5-Chloro-pyridin-2-ylcarbamoyl)-methyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-4-carboxylic acid. The corresponding dihydrochloride was obtained by treatment of the product with a 0.1 M HCl-solution and following lyophilization. Yield: 26 mg MS (ES+): m/e=499, chloro pattern.

1. additionwere added dropwise
2. concentrationThe mixture was concentrated under reduced pressure
3. customPurification by preparative HPLC (CH3CN/H2O gradient+0.05% formic acid)