[C:1]([O:5][C:6]([NH:8][C@@H:9]([CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[CH2:10]O)=[O:7])([CH3:4])([CH3:3])[CH3:2].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1COCC1>[C:1]([O:5][C:6]([N:8]1[CH2:10][C@@H:9]1[CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2](2S)-2-(tert-Butoxycarbonylamino)-3-phenyl-1-propanol (2.0 g, 8.0 mmol) in anhydrous THF (50 mL) at 0° C. under a dry N2 atmosphere was treated with triphenylphosphine (2.5 g, 9.5 mmol) and diethyl azodicarboxylate (1.66 g, 9.5 mmol). The mixture was stirred at 0° C. for 1 hour, allowed to warm to ambient temperature and stirred overnight. The mixture was partitioned between water (50 mL) and ethyl acetate (2×50 mL). The organic layers were combined, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (hexanes:CH2Cl2, 1:1) to provide the title compound as a colorless oil (1.4 g, 76%). Rf=0.54 (hexanes:ethyl acetate, 2:1); 1H NMR (CDCl3) δ 7.32-7.19 (m, 5H), 3.01-2.90 (m, 1H), 2.70-2.56 (m, 2H), 2.30 (m, 1H), 2.03 (m, 1H), 1.44 (s, 9H).
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