[Cl:1][C:2]1[C:7]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[CH:6][N:5]=[C:4]2[NH:13][CH:14]=[CH:15][C:3]=12.[H-].[Na+].[CH3:18][C:19]1[CH:24]=[CH:23][C:22]([S:25](Cl)(=[O:27])=[O:26])=[CH:21][CH:20]=1>CN(C=O)C>[Cl:1][C:2]1[C:7]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[CH:6][N:5]=[C:4]2[N:13]([S:25]([C:22]3[CH:23]=[CH:24][C:19]([CH3:18])=[CH:20][CH:21]=3)(=[O:27])=[O:26])[CH:14]=[CH:15][C:3]=12To a solution of ethyl 4-chloro-1H-pyrrolo[2,3-b]pyridine-5-carboxylate (1.32 g, 5.88 mmol) in DMF (39 mL) at about 0° C. was added sodium hydride (60% dispersion in mineral oil, 0.400 g, 10.00 mmol) and the reaction mixture was stirred at this temperature for about 15 min. A solution of 4-methylbenzene-1-sulfonyl chloride (2.24 g, 11.8 mmol) in DMF (17 mL) was added dropwise and the reaction mixture was allowed to warm to ambient temperature for about 2 h. The reaction mixture was concd under reduced pressure and the residue was partitioned between EtOAc and water (25 mL each). The aqueous layer was extracted with EtOAc (2×25 mL) and the combined organic layers were washed with brine, dried over anhydrous MgSO4, filtered, and concd under reduced pressure. The solid was triturated with heptane, and the precipitates were filtered to give ethyl 4-chloro-1-tosyl-1H-pyrrolo[2,3-b]pyridine-5-carboxylate (2.28 g, 102%, 90% purity) as a white solid: LCMS (Table 1, Method c) Rt=1.64 min; MS m/z: 379 (M+H)+.
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