Br[C:2]1[CH:3]=[CH:4][C:5]([NH:9][CH2:10][C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=2[Cl:17])=[N:6][C:7]=1[F:8].C([Mg]Cl)(C)C.C([Li])(C)(C)C.CN(C)[CH:30]=[O:31]>O1CCCC1.O>[Cl:17][C:12]1[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=1[CH2:10][NH:9][C:5]1[N:6]=[C:7]([F:8])[C:2]([CH:30]=[O:31])=[CH:3][CH:4]=1
To (5-bromo-6-fluoro-pyridin-2-yl)-(2-chloro-benzyl)-amine (46, 1.85 g, 5.86 mmol) in 25.0 mL of tetrahydrofuran under nitrogen at −78° C., isopropylmagnesium chloride (3.00 mL, 2.00 M in tetrahydrofuran, 6.00 mmol) was added over 10 minutes. After 50 minutes, tert-butyllithium (7.80 mL, 1.70 M in hexane, 13.3 mmol) was added over 5 minutes. After 20 minutes, N,N-dimethylformamide (1.09 mL, 14.0 mmol) was added and the reaction mixture stirred at −78° C. for 20 minutes, then brought to room temperature over 30 minutes. The reaction mixture was poured into water and extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate, filtered and the filtrate concentrated under vacuum. The resulting material was purified by silica gel column chromatography, eluting with 35% ethyl acetate in hexane. The appropriate fractions were combined and the solvents removed under vacuum to provide the desired compound (47, 1.45 g). MS (ESI) [M+H+]+=265.4.
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