Boron tribromide → 3-[(5-Chloro-pyridin-2-ylcarbamoyl)-methyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-3H-thieno[3,4-d]imidazole-6-carboxylic acid

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3-[(5-Chloro-pyridin-2-ylcarbamoyl)-methyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-3H-thieno[3,4-d]imidazole-6-carboxylic acid and 3-[(5-Chloro-pyridin-2-ylcarbamoyl)-methyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-3H-thieno[3,4-d]imidazole-4-carboxylic acid were prepared by a procedure according to example 81 starting from 500 mg (1.40 mmol) 2-(1-isopropyl-piperidin-4-ylcarbamoyl)-3H-thieno[3,4-d]imidazole-6-carboxylic acid methyl ester and 356.0 mg (1.40 mmol) 2-bromo-N-(5-chloro-pyridin-2-yl)-acetamide. Hydrolysis of the resulting esters by treatment with BBr3 according to example 16 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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