[Br:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]2[N:8]([S:11]([C:14]3[CH:20]=[CH:19][C:17]([CH3:18])=[CH:16][CH:15]=3)(=[O:13])=[O:12])[CH:9]=[CH:10][C:3]=12.[Li+].[CH3:22]C([N-]C(C)C)C.IC>C1COCC1>[Br:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]2[N:8]([S:11]([C:14]3[CH:20]=[CH:19][C:17]([CH3:18])=[CH:16][CH:15]=3)(=[O:13])=[O:12])[C:9]([CH3:22])=[CH:10][C:3]=12A mixture of 4-bromo-1-tosyl-1H-pyrrolo[2,3-b]pyridine (D20) (6 g, 17.08 mmol) in THF (100 ml) was cooled to −78° C. LDA (2M in THF) (21.35 mL, 42.7 mmol) was added at −78° C. and stirred at this temperature for ca. 1 hour. Iodomethane (2.136 ml, 34.2 mmol) was then added. After stirred at −78° C. for further ca. 30 min, the mixture was quenched by addition of saturated NH4Cl solution (150 mL), extracted with ethyl acetate (100 mL×3). The combined organics were dried over Na2SO4, filtered and concentrated. The residue was purified on normal phase chromatography eluting with a gradient of 0-30% ethyl acetate in cyclohexane to give the title compound containing impurities (5.4 g). LCMS (A): m/z (M+H)+ 365/367, C15H13BrN2O2S requires 364/366 (acidic).
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