Br[C:2]1(Br)[C:10]2[C:5](=[N:6][C:7]([Cl:11])=[CH:8][CH:9]=2)[NH:4][C:3]1=[O:12].BrC1(Br)C2C(=NC(Cl)=C(Br)C=2)NC1=O>C1COCC1.[Cl-].[NH4+].[Zn]>[Cl:11][C:7]1[N:6]=[C:5]2[NH:4][C:3](=[O:12])[CH2:2][C:10]2=[CH:9][CH:8]=1A solution of 2.36 g (7.26 mmol) of the mixture of 3,3-dibromo-6-chloro-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one and 3,3,5-tribromo-6-chloro-1,3-dihydro-2H-pyrrolo[2,3-b]pyridin-2-one in THF (70 mL) and saturated ammonium chloride solution (70 mL) was treated with, 6 g (92 mmol) of powdered zinc. The mixture was stirred for 2 h, and another 6 g (92 mmol) portion of zinc was added. Stirring was continued another 2 h. The zinc was filtered off and washed with ether. The ether phase was separated, and the aqueous phase was extracted twice with a 1:1 mixture of THF/ether. The combined organic extracts were dried over magnesium sulfate, filtered and concentrated. The crude residue was loaded onto 7.5 g of silica gel and chromatographed on silica gel, eluting with a 90% hexane/10% ethyl acetate to 66% hexane/33% ethyl acetate gradient to give 0.647 g of the title compound. 1H NMR (DMSO-d6): δ 3.57 (s, 2H), 7.04 (d, J=7.6 Hz, 1H), 7.61 (d, J=7.6 Hz, 1H), 11.2 (bs, 1H).
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