3,5-Bis(trifluoromethyl)hydrocinnamic acid → N-[(S)-1-benzyl-2-(4-benzyl-piperazin-1-yl)-2-oxo-ethyl]-3-(3,5-bis-trifluoromethyl-phenyl)-N-(4-pentyl-benzyl)-propionamide

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Acylation of 1-(4-benzyl-piperazin-1-yl)-(S)-2-(4-pentyl-benzylamino)-3-phenyl-propan-1-one (43.5 mg, 0.09 mmol) according to the procedure described for the preparation of Example 1 with 3,5-bis-trifluoromethyl-hydrocinnamic acid (28.33 mg, 0.099 mmol) gave 55.5 mg (82%) of N—[(S)-1-benzyl-2-(4-benzyl-piperazin-1-yl)-2-oxo-ethyl]-3-(3,5-bis-trifluoromethyl-phenyl)-N-(4-pentyl-benzyl)-propionamide. LC-MS: tR=1.05 min; [M+H]+=752.45.

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