[NH:1]1[C:5]2=[N:6][CH:7]=[CH:8][CH:9]=[C:4]2[CH:3]=[C:2]1[C:10]([O:12]C)=O.[NH3:14].O>CO>[NH:1]1[C:5]2=[N:6][CH:7]=[CH:8][CH:9]=[C:4]2[CH:3]=[C:2]1[C:10]([NH2:14])=[O:12]To a solution of methyl 1H-pyrrolo[2,3-b]pyridine-2-carboxylate (H-1) (880 mg, 5.0 mmol) in MeOH (2 mL) was added NH3.H2O (6 mL). The reaction was heated at 80° C. overnight. After being cooled to room temperature, the mixture was concentrated in vacuo to afford the title compound (805 mg) as a yellow solid, which was used for the next step without further purification. MS (m/z): 162 (M+1)+.
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