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A solution of 4-[(4-butylphenyl)ethynyl]benzaldehyde (2.62 g, 10.0 mmol, intermediate to which may be obtained according to methods disclosed in EP03103780.7) and 2-(4-chlorophenyl)ethylamine (Aldrich, 1.56 g, 10 mmol) was heated at reflux in toluene (50 mL) for 12 hrs with azeotropic removal of water. The mixture was evaporated under vacuum and the residue was taken up in MeOH (60 mL) and chilled at 0° C. NaBH4(567 mg, 15.0 mmol) was added portionwise and the reaction mixture was stirred for 30 min at 0° C. and 3 hrs at rt. The reaction mixture was poured into a saturated solution of NaCl and extracted with Et2O. The combined organic layers were dried over MgSO4 and the solvents were removed under reduced pressure to give the crude product. Purification by chromatography on silicagel (EtOAc/c-hex 30/70) gave 2.96 g (54%) of the title compound as a white solid. HPLC, Rt: 5.0 min (purity: 99.9%).

1. customThe mixture was evaporated under vacuum
2. extractionextracted with Et2O
3. dry with materialThe combined organic layers were dried over MgSO4
4. customthe solvents were removed under reduced pressure
5. customto give the crude product
6. customPurification by chromatography on silicagel (EtOAc/c-hex 30/70)