反应详情

By reacting ethyl 4-hydroxybenzoate with methyl 4-fluoro-3-methylsulfonylbenzoate in analogy with the protocol given under 14 d) methyl 4-(4-ethoxycarbonylphenoxy)-benzoate was obtained as a colorless to pale-yellow oil which was hydrolyzed, without any further purification steps, in analogy with the manner indicated in protocol 16 c), to give 4-(4-carboxyphenoxy)-3-methylsulfonyl-benzoic acid.