[OH-].[K+].[N:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[N:9]1[C:13]2=[N:14][CH:15]=[CH:16][CH:17]=[C:12]2[C:11]([C:18]([O:20]C)=[O:19])=[CH:10]1>CO.O>[N:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[N:9]1[C:13]2=[N:14][CH:15]=[CH:16][CH:17]=[C:12]2[C:11]([C:18]([OH:20])=[O:19])=[CH:10]1Potassium hydroxide (11.30 mg, 0.201 mmol) was added to a solution of methyl 1-(pyridin-2-yl)-1H-pyrrolo[2,3-b]pyridine-3-carboxylate (10.2 mg, 0.040 mmol) in MeOH (67.1 μl) and water (67.1 μl) at RT. The mixture was heated at 90° C. for 2 h. The organic layer was extracted into ethyl acetate after acidifying the mixture with 0.5 N citric acid. The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure to afford the title compound as a white solid, which was used without further purification.
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