[Li]CCCC.[Cl:6][C:7]1[CH:12]=[C:11]([F:13])[C:10]([Si:14]([CH3:17])([CH3:16])[CH3:15])=[C:9]([F:18])[CH:8]=1.[CH:19](N1CCOCC1)=[O:20]>C1COCC1>[Cl:6][C:7]1[C:8]([CH:19]=[O:20])=[C:9]([F:18])[C:10]([Si:14]([CH3:15])([CH3:17])[CH3:16])=[C:11]([F:13])[CH:12]=1A solution of 2.5M n-BuLi in hexanes (60 ml, 0.15 mol) was added drop-wise to a solution of (4-chloro-2,6-difluorophenyl)trimethylsilane (assumed 0.13 mol) in THF (180 mL) cooled to −70° C. under Ar. After the addition was complete, the mixture was stirred for 1 h before a solution of N-formylmorpholine (20 mL, 0.2 mol) in THF (25 mL) was added dropwise. The reaction was allowed to warm to rt with stirring and then cooled to 0° C. and quenched with H2O. Ether was added, the phases were separated, the aqueous phase was re-extracted with ether and the combined organics washed with brine, dried over MgSO4 and concentrated in vacuo to give the title compound (35 g) as an orange oil which was used without further purification.
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