Cl[CH2:2][C:3](=[O:13])[CH2:4][C:5]1[CH:10]=[CH:9][CH:8]=[C:7]([F:11])[C:6]=1[CH3:12].[Br-:14].[Li+]>CC(C)=O>[Br:14][CH2:2][C:3](=[O:13])[CH2:4][C:5]1[CH:10]=[CH:9][CH:8]=[C:7]([F:11])[C:6]=1[CH3:12]The compound of step 1 (3.20 g, 15.95 mmol) was dissolved in acetone (70 ml), and lithium bromide (11.08 g, 127.59 mmol) was added. The mixture was stirred overnight. The solvent was evaporated, the resulting solid was dissolved in EA and the solution washed twice with water followed by a saturated solution of sodium chloride, dried over sodium sulfate, filtered and evaporated to dryness. 3.66 g of the title compound were obtained as a white powder.
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