C([Li])CCC.CC1(C)CCCC(C)(C)N1.[CH3:16][N:17]1[CH2:22][CH2:21][CH:20]([NH:23][CH2:24][C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=2[F:31])[CH2:19][CH2:18]1.[Br:32]C(Cl)(Cl)C(Br)(Cl)Cl>C1COCC1>[CH3:16][N:17]1[CH2:22][CH2:21][CH:20]([NH:23][CH2:24][C:25]2[CH:30]=[CH:29][CH:28]=[C:27]([Br:32])[C:26]=2[F:31])[CH2:19][CH2:18]1
Add n-butyl lithium (1.6 M in hexanes, 4.3 mL) into a solution of 2,2,6,6-tetramethyl-piperidine (0.97 g) in THF (10 mL) at −78° C. and stir for 30 minutes. Add a solution of 1-methyl-4-(N-(2-fluorophenyl)methylamino)piperidine (Preparation 23, 1.02 g) in THF (10 mL) portion wise and stir for 10 minutes. Add 1,2-dibromo-1,1,2,2-tetrachloroethane (1.50 g) in THF (10 mL) dropwise and stir for 1 hr. Remove the cooling bath and stir for 30 minutes. Partition between ethyl acetate and saturated aqueous NaCl, dry over anhydrous sodium sulfate, evaporate and purify on a silica gel column (110 g), using a gradient of dichloromethane-2M NH3 in methanol to give 0.49 g of the title intermediate.
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