Br[C:2]1(Br)[C:10]2[C:5](=[N:6][CH:7]=[CH:8][CH:9]=2)[N:4]([CH2:11][O:12][CH2:13][CH2:14][Si:15]([CH3:18])([CH3:17])[CH3:16])[C:3]1=[O:19]>C1COCC1.[NH4+].[Cl-].[Zn]>[CH3:16][Si:15]([CH3:18])([CH3:17])[CH2:14][CH2:13][O:12][CH2:11][N:4]1[C:5]2=[N:6][CH:7]=[CH:8][CH:9]=[C:10]2[CH2:2][C:3]1=[O:19]Zinc (100 g, 1.54 mol) was added to a solution of 3,3-dibromo-1-{[2-(trimethylsilyl)ethoxy]methyl}-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one (65 g, 0.154 mol) in THF (880 mL) and saturated aqueous NH4Cl (220 mL). After 3 h, the reaction mixture was filtered and concentrated in vacuo. The residue was partitioned between EtOAc and H2O which resulted in the formation of a white precipitate. Both layers were filtered through a Celite pad and the layers were separated. The aqueous layer was washed with EtOAc (2×500 mL) and the combined organic layers were washed with H2O, dried over MgSO4, filtered, and concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with CH2Cl2:EtOAc-90:10, to give the title compound. MS: m/z=265 (M+1).
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