3-Bromomethyl-5-(5-chloro-thiophen-2-yl)-isoxazole → 3-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-3H-thieno[3,4-d]imidazole-4-carboxylic acid

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반응 단계

3-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-2-(1-isopropyl-piperidin-4-ylcarbamoyl)-3H-thieno[3,4-d]imidazole-6-carboxylic acid and 3-[5-(5-Chloro-thiophen-2-yl)-isoxazol-3-ylmethyl]-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 397.4 mg (1.40 mmol) 3-bromomethyl-5-(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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