Acetonitrile--water (1/1) → 1-[3-(5-Chloro-thiophen-2-yl)-isoxazol-5-ylmethyl]-2-(1-cyclopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-5-carboxylic acid

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1-[3-(5-Chloro-thiophen-2-yl)-isoxazol-5-ylmethyl]-2-(1-cyclopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-5-carboxylic acid and 3-[3-(5-Chloro-thiophen-2-yl)-isoxazol-5-ylmethyl]-2-(1-cyclopropyl-piperidin-4-ylcarbamoyl)-3H-benzoimidazole-5-carboxylic acid were prepared by a procedure according to example 81 starting from 240 mg (0.70 mmol) 2-(1-Cyclopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-5-carboxylic acid methyl ester and 201.3 mg (0.70 mmol) 5-bromomethyl-3-(5-chloro-thiophen-2-yl)-isoxazole. Hydrolysis of the resulting esters and purification by preparative RP-HPLC (CH3CN/H2O gradient+0.05% formic acid) gave the title compounds as their formiates in form of white amorphous solids. Structural assignment of both isomers was achieved by NOE-spectroscopy.

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