Triethylamine → 2-oxo-1,3-dioxolan-4-yl 2-ethoxy-1-{[2'-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)biphenyl-4-yl]methyl}-1H-benzimidazole-7-carboxylate

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A solution of 2-ethoxy-1-{[2′-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)biphenyl-4-yl]methyl}-1H-benzimidazole-7-carboxylic acid (1.0 g), 4-chloro-1,3-dioxolan-2-one (0.41 g) and triethylamine in DMF was stirred at 90° C. for 12 hrs. The reaction mixture was concentrated, and the residue was dissolved in chloroform and 1N hydrochloric acid. The organic layer was separated, dried over anhydrous sodium sulfate and concentrated. The residue was purified by silica gel column chromatography to give the title compound (0.20 g, 22%) as a colorless solid.

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