Br[C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][C:10]=1[F:11])[N:7]([CH3:12])[N:6]=[CH:5]2.[Li]CCCC.[Cl:18][C:19]1[CH:20]=[CH:21][C:22]2[N:23]([C:25]([C:28](=[O:30])[CH3:29])=[CH:26][N:27]=2)[N:24]=1>C1COCC1>[Cl:18][C:19]1[CH:20]=[CH:21][C:22]2[N:23]([C:25]([C:28]([C:2]3[CH:3]=[C:4]4[C:8](=[CH:9][C:10]=3[F:11])[N:7]([CH3:12])[N:6]=[CH:5]4)([OH:30])[CH3:29])=[CH:26][N:27]=2)[N:24]=1To a solution of 5-bromo-6-fluoro-1-methyl-1H-indazole (1.800 g, 7.86 mmol) in THF (79 ml) at −100° C., was added n-BuLi (5.40 ml, 8.64 mmol) dropwise. After stirring for 1 h at −100° C., 1-(6-chloroimidazo[1,2-b]pyridazin-3-yl)ethanone (1.691 g, 8.64 mmol) in THF (20 mL) was added dropwise. The reaction solution was stirred for additional 2 h and was quenched with NH4Cl (aq). The resulting mixture was extracted with EtOAc. Combined organic layers were washed with NH4Cl(aq), dried over Na2SO4 and concentrated in vacuo to afford a crude product, which was purified on silica gel column chromatography (Hexanes:EtOAc) to give the title compound in 34% yield. LCMS (method B): [MH]+=346, tR=2.14 min.
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