[OH:1][CH2:2][C@H:3]([NH:7][C:8](=[O:14])[O:9][C:10]([CH3:13])([CH3:12])[CH3:11])[C@H:4]1[CH2:6][O:5]1.[CH2:15](I)[CH:16]=[CH2:17]>C1(C)C=CC=CC=1.[Ag-]=O>[CH2:17]([O:1][CH2:2][C@H:3]([NH:7][C:8](=[O:14])[O:9][C:10]([CH3:11])([CH3:13])[CH3:12])[C@H:4]1[CH2:6][O:5]1)[CH:16]=[CH2:15]To a solution of tert-butyl (S)-2-hydroxy-1-((S)-oxiran-2-yl)ethylcarbamate (0.125 g, 0.6 mmol; see: Kurokawa, N.; Ohfune, Y. Tetrahedron 1993, 49, 6195) in toluene (6 mL), was added allyliodide 0.3 mL, 3 mmol) followed by silver(I) oxide (0.7 g, 3 mmol). The solution was stirred at 65° C. in a darkened hood for a period of 15 h. The mixture was then cooled to ambient temperature, filtered through Celite, washed with CH2Cl2, and conc. in vacuo. Purification on SiO2 (10-20% EtoAc/Hexanes) gave the title compound as a yellow oil.
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