Acetic Acid → Methyl 4-(1-hydroxy-1-methylethyl)-2-(1-methoxyethyl)-1-{4-[2-(tetrazol-5-yl)phenyl]phenyl}methylimidazole-5-carboxylate

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반응 단계

A solution of 600 mg of methyl 4-(1-hydroxy-1-methylethyl)-2-(1-methoxyethyl)-1-{4-[2-(trityltetrazol-5-yl)phenyl]phenyl}methylimidazole-5-carboxylate [prepared as described in step (a) above] in 10 ml of a 25% v/v aqueous solution of acetic acid was stirred at 60° C. for 1.5 hours. The solution was then mixed with 10 ml of water and cooled with ice. The trityl alcohol which appeared as crystals was filtered off. The filtrate was concentrated by distillation under reduced pressure, and then acetic acid and water were distilled off as azeotropic mixtures with toluene, to give 331 mg of the title compound as an amorphous powder.

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