[Br:1][C:2]1[CH:7]=[C:6]([O:8][CH3:9])[CH:5]=[CH:4][C:3]=1[OH:10].Br[CH2:12][CH:13]([O:17][CH2:18][CH3:19])[O:14][CH2:15][CH3:16].C([O-])([O-])=O.[Cs+].[Cs+]>CN(C=O)C.CCOC(C)=O>[Br:1][C:2]1[CH:7]=[C:6]([O:8][CH3:9])[CH:5]=[CH:4][C:3]=1[O:10][CH2:12][CH:13]([O:17][CH2:18][CH3:19])[O:14][CH2:15][CH3:16]A mixture of the product from Step A (1.01 g, 5 mmol), 2-bromo-1,1-diethoxyethane (1.05 g, 5.25 mmol) and Cs2CO3 (2.04 g, 6 mmol) in DMF (10 mL) was stirred at 120° C. for 2 hrs. The reaction was cooled to room temperature. The mixture was diluted with EtOAc (200 mL) and washed with brine (50 mL), dried over anhydrous sodium sulfate and concentrated. The residue was purified by column chromatography (eluted with PE:EtOAc=6:1) to the title compound (2.7 g, 85%) as an oil. 1H-NMR (600 MHz, CDCl3) δ 7.12 (d, J=3.0 Hz, 1H), 6.89 (d, J=9.0 Hz, 1H), 6.81 (dd, J=9.0, 3.0 Hz, 1H), 4.87 (t, J=5.2 Hz, 1H), 4.02 (d, J=5.2 Hz, 2H), 3.84-3.78 (m, 2H), 3.77 (s, 3H), 3.73-3.67 (m, 2H), 1.27 (t, J=7.1 Hz, 6H) ppm.
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