Br[C:2]1[N:6]2[CH:7]=[CH:8][CH:9]=[N:10][C:5]2=[N:4][CH:3]=1.C([Mg]Cl)(C)C.Cl[Sn:17]([CH3:20])([CH3:19])[CH3:18]>O1CCCC1>[CH3:18][Sn:17]([CH3:20])([CH3:19])[C:2]1[N:6]2[CH:7]=[CH:8][CH:9]=[N:10][C:5]2=[N:4][CH:3]=1To a cooled (−78° C.) solution of 3-bromoimidazo[1,2-a]pyrimidine (1.0 g, 5.1 mmol) in anhydrous tetrahydrofuran (40 mL) under an atmosphere of nitrogen was added isopropylmagnesium chloride (2.0M solution in tetrahydrofuran, 2.8 mL, 5.6 mmol) dropwise over 10 minutes. The reaction was stirred for 2 h then a solution of chlorotrimethylstannane (1.1 g, 5.6 mmol) in tetrahydrofuran (10 mL) was added dropwise over 10 minutes. The reaction mixture was stirred for 30 minutes then allowed to warm to room temperature. The reaction was quenched with water (20 mL) and extracted with DCM (2×50 mL). The combined organic layer was dried over sodium sulfate, filtered, and evaporated in vacuo to afford the title compound as an orange oil which was used without any further purification.
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