(RS)-N,N-dimethyl-{2-[4-(alpha-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}-acetamide → Cetirizine Hydrochloride

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The procedure described in Example 14 is followed with the difference that, instead of the (RS)-N,N-dimethyl-{2-[4-(α-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}-acetamide, 104.4 g (0.2 moles) of (RS)-N,N-diethyl-{2-[4-(α-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}-acetamide are used, 100 ml of dioxane are employed as cosolvent, and, during the alkaline hydrolysis, the reaction mixture is boiled for 4 hours. Thus, 69.1 g (74.9%) of the title compound are obtained, m.p.: 225-228° C. The purity of the product corresponds to the quality requirements given in Eur. Pharm., 3, 1997, 1084.

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