Ethylene Glycol → 1-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-4-carboxylic acid 2-hydroxy-ethyl ester

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50 mg (0.08 mmol) 1-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-4-carboxylic acid were dissolved in 4 mL DMF. Subsequently 20 mg DMAP, 34.3 mg (0.16 mmol) DCC and 46 μl (0.83 mmol) ethylene glycol were added. The resulting mixture was stirred for 8 h at 60° C. and then concentrated under removed pressure. The remaining residue was purified by preparative HPLC (CH3CN/H2O gradient+0.05% formic acid) to give pure 1-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-4-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. Yield: 22 mg MS (ES+): m/e=572, chloro pattern.

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