| 摘要 |
A process for preparing fexofenadine is described that includes the purification of 4-[4-chloro-1-oxobutyl]-2,2-dimethylphenyl acetic acid alkyl ester by means of suspension in a hydrocarbon, preferably n-heptane. The compound thus obtained is dissolved in a suitable solvent and condensed with azacyclanol to give the compound shown below where R is an alkyl radical, which is then hydrolysed and reduced to give fexofenadine.
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