50 mg (0.08 mmol) 3-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-3H-benzoimidazole-5-carboxylic acid were dissolved in 10 mL CH2Cl2. Subsequently 3 mg DMAP, 23 mg (0.11 mmol) DCC and 46 μl (0.83 mmol) ethylene glycol were added. The resulting mixture was stirred at room temperature for 16 h and then concentrated under removed pressure. The remaining residue was purified by preparative HPLC (CH3CN/H2O gradient+0.05% formic acid) to give pure 3-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-3H-benzoimidazole-5-carboxylic acid 2-hydroxy-ethyl ester as a white amorphous solid. The corresponding dihydrochloride was obtained by treatment with a 0.1 M HCl-solution and following lyophilization.
