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

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1-[5-(5-Chloro-thiophen-2-yl)-[1,3,4]thiadiazol-2-ylmethyl]-2-(1-cyclopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-5-carboxylic acid and 3-[5-(5-Chloro-thiophen-2-yl)-[1,3,4]thiadiazol-2-ylmethyl]-2-(1-cyclopropyl-piperidin-4-ylcarbamoyl)-3H-benzoimidazole-5-carboxylic acid were prepared by a procedure according to example 81 starting from 200 mg (0.58 mmol) 2-(1-Cyclopropyl-piperidin-4-ylcarbamoyl)-1H-benzoimidazole-5-carboxylic acid methyl ester and 181.8 mg (0.58 mmol) 2-bromomethyl-5-(5-chloro-thiophen-2-yl)-[1,3,4]thiadiazole. 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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