Process for preparing N-methyl-3-(P-trifluoromethylphenoxy)-3-phenyl-propylamine and salts thereof in a highly pure form

摘要

The present invention relates to a process for preparing N-methyl-3-(p-trifluoromethylphenoxy)-3-phenyl-propylamine and pharmaceutically acceptable acid addition salts thereof. The process in accordance with the present invention comprises reacting 1-phenyl-3-(N-methylamine) propane-1-ol with 1-chloro-4-trifluoromethylbenzene, in the presence of an hydroxide of an alkaline metal in a dipolar aprotic solvent non saponifiable in reaction conditions. The process in accordance with the present invention further comprises a final crystallization step which allows to obtain the active ingredient in a highly pure crystalline form.