Trifluoroacetic acid → 3-Chloro-N-cyclohexyl-N-propyl-5-[2-(pyridin-4-ylamino)-ethoxy]-benzamide trifluoroacetate salt

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A solution of {2-[3-(propyl-cyclopentyl-carbamoyl)-5-chloro-phenoxy]-ethyl}-pyridin-4-yl-carbamic acid tert-butyl ester (0.07 g) in a mixture of dichloromethane (2 ml) and trifluoroacetic acid (2 ml) was stored at room temperature for 1 h and then concentrated under reduced pressure. The residue was subjected to preparative hplc and the title compound (0.036 g) was obtained as a colourless gum by concentration of the required fraction under reduced pressure and drying by repetitive addition of acetonitrile and concentration under reduced pressure.

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