[CH2:1]([N:8]1[CH2:13][CH2:12][CH:11]([CH2:14][CH2:15][OH:16])[CH2:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[F:17][C:18]1[CH:23]=[CH:22][C:21](O)=[CH:20][CH:19]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CCOC(/N=N/C(OCC)=O)=O>CCOCC>[CH2:1]([N:8]1[CH2:13][CH2:12][CH:11]([CH2:14][CH2:15][O:16][C:21]2[CH:22]=[CH:23][C:18]([F:17])=[CH:19][CH:20]=2)[CH2:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1To a solution of 1.5 g (6.84 mmol) of 1-benzyl-4-(2-hydroxy-1-ethyl)piperidine (Acros Chemical), 3.8 g (34.2 mmol) of 4-fluorophenol and 3.6 g (13.7 mmol) of triphenylphosphine in 25 mL of ether at 0° C. was slowly added dropwise 2.15 mL (13.7 mmol) of diethylazodicarboxylate (DEAD). The reaction mixture was allowed to warm to rt and was stirred for 12 h. To the reaction mixture was added 70 mL of ether and it was filtered through a thin pad of celite. The filtrate was washed with sat'd Na2CO3 solution and sat's NaCl solution. It was dried over MgSO4, filtered and the filtrate concentrated. The residue was purified by chromatography (silica, hexanes: ethyl acetate, 4:1) to give 0.85 g of the title compound.
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