[OH-].[Na+].[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.Cl>O1CCCC1>[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]11.6 cm3 of 10N sodium hydroxide solution were added to methyl 1-(pyridine-2-yl)-1H-pyrrolo[2,3-b]pyridine-3-carboxylate in 15 cm3 of tetrahydrofuran. After stirring at reflux of the solvent for 200 h, the reaction mixture was acidified with 2 cm3 of 10N hydrochloric acid and then concentrated to dryness under reduced pressure (2.7 kPa) to give 1-(pyridin-2-yl)-1H-pyrrolo[2,3-b]pyridine-3-carboxylic acid in the form of a brown powder, characterized by LC/MS (m/z 240 [MH]+), which was used directly in the following stage.
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