Hydroquinone → 1,4-Bis(2,2,2-trifluoroethoxy)benzene

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In one aspect of the invention, a method of preparing a 2,5-bis(2,2,2-trifluoroethoxy)-N-(2-piperidylmethyl)benzamide is provided which comprises the following steps. Hydroquinone is contacted with 2,2,2-trifluoroethyl trifluoromethanesulfonate under conditions to yield 1,4-bis(2,2,2-trifluoroethoxy)benzene. Then, in the presence of a Lewis acid catalyst, the 1,4-bis(2,2,2-trifluoroethoxy)benzene is treated with an acetylation agent under conditions to create 2,5-bis(2,2,2-trifluoroethoxy)acetophenone. The methyl moiety of the acetophenone function of the 2,5-bis(2,2,2-trifluoroethoxy)acetophenone is thereafter replaced using hypochlorite to yield 2,5-bis(2,2,2-trifluoroethoxy)benzoic acid. The 2,5-bis(2,2,2-trifluoroethoxy)benzoic acid is then treated with an inorganic chloride to provide 2,5-bis(2,2,2-trifluoroethoxy)benzoic acid chloride. Subsequently, the resultant 2,5-bis(2,2,2-trifluoroethoxy)benzoic acid chloride is contacted with 2-aminomethylpyridine, whereby there is formed 2,5-bis(2,2,2-trifluoroethoxy)-N-(2-pyridylmethyl)benzamide. Finally, the 2,5-bis(2,2,2-trifluoroethoxy)-N-(2-pyridylmethyl)benzamide is treated with an agent capable of hydrogenation of the aromatic bond in the heterocyclic ring, whereby there is formed a 2,5-bis(2,2,2-trifluoroethoxy)-N-(2-piperidylmethyl)benzamide.

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