Reaction Steps
To a suspension of NaH (0.088 g, 3.68 mmol) in DMF (10 mL) was added dropwise a solution of (2S,3R,4S)-4-benzyl-2-((4-methoxybenzyl)oxy)hex-5-en-3-ol (1 g, 3.06 mmol) in DMF (5 mL). The mixture was stirred at room temperature for 20 min and then 1-bromo-2-methoxyethane (0.852 g, 6.13 mmol) was added. The reaction mixture was heated to 60° C. for 5 h. The reaction was cooled to room temperature and another portion of NaH (0.088 g, 3.68 mmol) and 1-bromo-2-methoxyethane (0.852 g, 6.13 mmol) were added, and the reaction mixture was heated to 60° C. and stirred overight. The reaction mixture was quenched with saturated NH4Cl and the phases were separated. The aqueous phase was extracted with EtOAc (2×40 mL), and the combined organic phases were dried over MgSO4, concentrated, and purified by column chromatography on SiO2 (EtOAc/hexanes) to furnish the title product as colorless oil (0.730 g, 62%): 1H NMR (400 MHz, CDCl3) δ 7.30-7.06 (m, 7H), 6.86 (dd, J=8.6, 0.9 Hz, 2H), 5.68-5.47 (m, 1H), 4.95-4.69 (m, 2H), 4.60-4.26 (m, 2H), 4.04-3.91 (m, 1H), 3.79 (s, 3H), 3.73-3.69 (m, 1H), 3.68-3.60 (m, 1H), 3.59-3.53 (m, 2H), 3.39 (d, J=0.8 Hz, 3H), 3.38-3.36 (m, 1H), 3.15 (d, J=10.4 Hz, 1H), 2.70-2.42 (m, 2H), 1.30-1.17 (m, 3H); 13C NMR (101 MHz, CDCl3) δ 159.05, 140.67, 138.83, 130.95, 129.56, 129.11, 127.92, 125.60, 116.61, 113.74, 84.59, 76.46, 72.41, 71.76, 70.26, 58.96, 55.28, 48.55, 36.96, 14.01; ESIMS m/z 407.2 ([M+Na]+).
