[CH3:1][O:2][C:3](=[O:13])[C:4]([CH3:12])([CH3:11])[CH2:5][O:6][Si](C)(C)C.[O:14]1[CH2:18][CH2:17][C:16](=O)[CH2:15]1.C([SiH](CC)CC)C.C([O-])(O)=O.[Na+]>[N+](C)([O-])=O>[CH3:1][O:2][C:3](=[O:13])[C:4]([CH3:12])([CH3:11])[CH2:5][O:6][CH:16]1[CH2:17][CH2:18][O:14][CH2:15]12,2-Dimethyl-3-trimethylsilanyloxy-propionic acid methyl ester (478 mg, 2.34 mmol) was added to a solution of dihydro-furan-3-one (168 mg, 1.95 mmol) and FeCl3 (16 mg, 0.097 mmol) in nitromethane (6.0 mL) at 0° C. Triethylsilane (0.374 mL, 2.33 mmol) was added and the reaction was warmed to room temperature and stirred for 2 h. Sat. NaHCO3 was added and the reaction was extracted with dichloromethane. The organic layer was separated, washed with brine, dried over Na2SO4 and concentrated to give a pale liquid. Purification by flash column chromatography on silica gel using 30% ethyl acetate in hexanes provided dimethyl-3-(tetrahydro-furan-3-yloxy)-propionic acid methyl ester (353 mg, 75%) as a colorless liquid.
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