[CH2:1]([O:8][C:9](=[O:17])[NH:10][CH2:11][CH2:12][O:13][CH2:14][CH2:15][OH:16])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Cl:18][C:19]1[CH:24]=[CH:23][C:22](O)=[CH:21][CH:20]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CCOC(/N=N/C(OCC)=O)=O>O1CCCC1>[CH2:1]([O:8][C:9](=[O:17])[NH:10][CH2:11][CH2:12][O:13][CH2:14][CH2:15][O:16][C:22]1[CH:23]=[CH:24][C:19]([Cl:18])=[CH:20][CH:21]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1
[2-(2-Hydroxy-ethoxy)-ethyl]-carbamic acid benzyl ester (2.39 g, 10 mmol), 4-chlorophenol (1.29 g, 10 mmol), and triphenylphosphine (2.89 g, 11 mmol) were dissolved in tetrahydrofuran (50 ml), followed by the dropwise addition of diethylazodicarboxylate (1.73 ml, 11 mmol). After the addition, the reaction solution was stirred at room temperature for 10-12 hours. The solvent was then removed in vacuo. The remaining residue was stirred in 30% EtOAc in hexane (200 mL) for 10 minutes and a white solid was formed. This solid was then filtered and washed with 30% EtOAc in hexane (3×20 mL). The filtrates were combined and the solvents were removed in vacuo. The remaining residue was purified by flash column chromatography (SiO2, 2:1 hexane:EtOAc) to give {2-[2-(4-chloro-phenoxy)-ethoxy]-ethyl}-carbamic acid benzyl ester as clear solid (3.49 g, 99.8% yield). 1H-NMR (CDCl3, ppm) 7.35 (m, 5H), 7.20 (d, 2H), 6.82 (d, 2H), 5.22 (b, 1H), 5.10 (s, 2H), 4.07 (t, 2H), 3.80 (t, 2H), 3.62 (t, 2H), 3.41 (q, 2H). ESMS 350.1 (M+l), 372.1 (M+23).
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