C[O:2][C:3]1[CH:11]=[C:10]2[C:6]([C:7]([S:15]([N:18]3[CH2:23][CH2:22][O:21][CH2:20][CH2:19]3)(=[O:17])=[O:16])=[C:8]([C:12]([NH2:14])=[O:13])[NH:9]2)=[CH:5][CH:4]=1.B(Br)(Br)Br.CCOC(C)=O.C([O-])(O)=O.[Na+]>ClCCl>[OH:2][C:3]1[CH:11]=[C:10]2[C:6]([C:7]([S:15]([N:18]3[CH2:23][CH2:22][O:21][CH2:20][CH2:19]3)(=[O:17])=[O:16])=[C:8]([C:12]([NH2:14])=[O:13])[NH:9]2)=[CH:5][CH:4]=1To a suspension of 6-methoxy-3-(morpholin-4-ylsulfonyl)-1H-indole-2-carboxamide from Example 5 (134 mg, 0.395 mmol) in 5 mL of dichloromethane at −78° C. was added boron tribromide solution (1 M in dichloromethane, 1.97 mmol). After 10 minutes the mixture was allowed to warm to room temperature, and stir for an additional 4 hours. The reaction was poured into a mixture of EtOAc and saturated aqueous NaHCO3 solution. The organic phase was washed with water and brine, dried with Na2SO4, filtered, and concentrated in vacuo. Trituration with chloroform gave the titled compound as a brown powder. HRMS (ES) exact mass calculated for C13H16N3O5S (M+H+): 326.0805. Found 326.0794.
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