[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([I:8])=[CH:4][C:3]=1[OH:9].O[CH:11]1[CH2:16][CH2:15][N:14]([C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[CH2:13][CH2:12]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1COCC1>[C:20]([O:19][C:17]([N:14]1[CH2:15][CH2:16][CH:11]([O:9][C:3]2[CH:4]=[C:5]([I:8])[CH:6]=[CH:7][C:2]=2[Cl:1])[CH2:12][CH2:13]1)=[O:18])([CH3:23])([CH3:21])[CH3:22]
2-Chloro-5-iodophenol (2.50 g, 9.83 mmol), tert-butyl 4-hydroxy-1-piperidinecarboxylate (2.97 g, 14.7 mmol) and triphenylphosphine (5.15 g, 19.6 mmol), were suspended in THF (50 mL) and cooled to 0° C. Diethyl azodicarboxylate (3.08 mL, 19.6 mmol) was then added dropwise, the reaction was stirred under a N2 atmosphere for 18 h. The reaction was then partitioned between H2O and EtOAc. The organic layer was separated, washed with saturated brine, dried over MgSO4, concentrated in vacuo and subjected to FCC, eluting with 0-50% EtOAc/cyclohexane, to afford the title compound (3.43 g, 80%). (Method 3): Rt 4.98 min, m/z 337.9 [M−BOC+].
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