[H-].[Na+].[Cl:3][C:4]1[C:9]([Cl:10])=[CH:8][N:7]=[C:6]2[NH:11][CH:12]=[CH:13][C:5]=12.[C:14]1([CH3:24])[CH:19]=[CH:18][C:17]([S:20](Cl)(=[O:22])=[O:21])=[CH:16][CH:15]=1>CN(C)C=O>[Cl:3][C:4]1[C:9]([Cl:10])=[CH:8][N:7]=[C:6]2[N:11]([S:20]([C:17]3[CH:18]=[CH:19][C:14]([CH3:24])=[CH:15][CH:16]=3)(=[O:22])=[O:21])[CH:12]=[CH:13][C:5]=12To 60% sodium hydride in mineral oil (1.390 g, 34.8 mmol) in N,N-dimethylformamide (60 mL) at 0° C. was added a solution of 4,5-dichloro-1H-pyrrolo[2,3-b]pyridine (Adesis, 5.0 g, 26.7 mmol) in N,N-dimethylformamide (20 mL) slowly over 5 minutes. The mixture was allowed to warm to room temperature and was stirred for 30 minutes. The mixture was cooled to 0° C. and a solution of p-toluenesulfonyl chloride (5.35 g, 28.1 mmol) in N,N-dimethylformamide (20 mL) was added. The mixture was allowed to warm to room temperature and stirred for 2 hours. Additional p-toluenesulfonyl chloride (500 mg, 2.62 mmol) was added, and the mixture was stirred another 1 hour at room temperature. The reaction was quenched with saturated aqueous ammonium chloride (25 mL) and extracted with ethyl acetate (twice). The combined organic layers were washed with water and brine, dried over sodium sulfate, filtered and concentrated. The residue was purified by flash chromatography on silica gel (AnaLogix IntelliFlash 280) eluting with a gradient of 40-70% ethyl acetate in hexanes to afford the title compound. MS (ESI+) m/z 341.6 (M+H)+.
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