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

Participants

Reaction Steps

In another 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. The compound 1,4-dibromobenzene is contacted with an alkali metal 2,2,2-trifluoroethoxide in the presence of cuprous or cupric ion and in a strongly polar solvent comprising 2,2,2-trifluoroethanol 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 said 2,5-bis(2,2,2-trifluoroethoxy)acetophenone is thereafter replaced 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 a 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.

Provenance & Evidence