[Cl:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[O:9][CH2:10][CH2:11][O:12][CH3:13].C([Li])CCC.CN(C)[CH:21]=[O:22].O>O1CCCC1>[Cl:1][C:2]1[C:3]([O:9][CH2:10][CH2:11][O:12][CH3:13])=[CH:4][CH:5]=[C:6]([F:8])[C:7]=1[CH:21]=[O:22]To 2-chloro-4-fluoro-1-(2-methoxy-ethoxy)-benzene (122, 1.50 g, 7.33 mmol) in tetrahydrofuran (44.0 mL), under an atmosphere of nitrogen at −78° C., n-butyllithium (2.50 M in hexane, 3.08 mL) was added slowly. After 15 minutes, N,N-dimethylformamide (0.681 mL, 8.80 mmol) was added to the reaction. After 30 minutes, the reaction was allowed to warm to room temperature. The reaction was poured into water and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated and purified by silica gel column chromatography eluting with 30% ethyl acetate in hexane to give a light yellow solid (123, 1.20 g, 70.4%).
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