[OH:1][C:2]1[CH:12]=[CH:11][C:5]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[CH:4][CH:3]=1.Br[CH2:14][CH2:15][CH3:16].[H-].[Na+]>CN(C=O)C.C(OCC)(=O)C>[CH2:9]([O:8][C:6](=[O:7])[C:5]1[CH:4]=[CH:3][C:2]([O:1][CH2:14][CH2:15][CH3:16])=[CH:12][CH:11]=1)[CH3:10](Scheme 1, Compound A) To a solution of ethyl 4-hydroxybenzoate (2.0 g, 12 mmol) and bromopropane (4.0 g, 32.8 mmol) in DMF (50 mL) was added NaH (60% in mineral oil, 0.80 g, 20.8 mmol). The resultant suspension was stirred at room temperature for 1.0 hour. The mixture was diluted with ethyl acetate (EtOAc) (300 mL), washed with H2O, and then was dried over Na2SO4. After filtration and concentration in vacuo, the residue was purified by flash chromatography (SiO2: EtOAc/Hexanes). This compound was obtained as a yellow oil (2.26 g, 10.9 mmol, 91% yield). 1H NMR (DMSO-d6) δ 7.89 (d, 2H, J=8.7 Hz), 7.00 (d, 2H, J=9.0 Hz), 4.24 (q, 2H, J=6.9 Hz), 3.98 (t, 2H, J=6.6 Hz), 1.72 (m, 2H), 1.29 (t, 3H, J=6.6 Hz), 0.97 (t, 3H, J=7.2 Hz); Anal. Calcd for C12H16O3.0.47C6H14: C, 71.54; H, 9.14; N, 0.00. Found: C, 71.57; H, 8.78; N, 0.00; Mass Spec.: 209.04 (MH+).
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