[H-].[Na+].[C:3]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])(=[O:10])[CH2:4][C:5]([O:7][CH2:8][CH3:9])=[O:6].Br[CH2:17][CH2:18][O:19][CH2:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.O>CN(C)C=O.CCCCCC.C(OCC)(=O)C>[CH2:8]([O:7][C:5](=[O:6])[CH:4]([CH2:17][CH2:18][O:19][CH2:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1)[C:3]([O:11][C:12]([CH3:14])([CH3:13])[CH3:15])=[O:10])[CH3:9]To a suspension of sodium hydride (3.22 g, 0.134 mole) in N,N-dimethylformamide (DMF)(150 mL) was added tert-butyl ethyl malonate (22.9 g, 0.122 mole). The resulting mixture was stirred at room temperature for 1 hour and then a solution of (2-bromoethoxymethyl)benzene (28.8 g, 0.134 mole) in DMF (150 mL) was added dropwise. After stirring at room temperature overnight, the mixture was poured into water (1000 mL) and extracted with ethyl acetate. The ethyl acetate layer was washed with water and brine, dried over magnesium sulfate and concentrated to an oil which was chromatographed on silica gel eluting with hexane and then 5% ethyl acetate in hexane to afford 2-(2-benzyloxyethyl)malonic acid tert-butyl ester ethyl ester as an oil (31.4 g, 80% yield).
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