Ammonia → 1H-pyrrolo(2,3-b)pyridin-6-amine
Reaction equation
[NH:1]1[C:5]2=[N+:6]([O-])[CH:7]=[CH:8][CH:9]=[C:4]2[CH:3]=[CH:2]1.S(OC)(OC)(=O)=O.[NH3:18]>C(#N)C.CO>[NH:1]1[C:5]2=[N:6][C:7]([NH2:18])=[CH:8][CH:9]=[C:4]2[CH:3]=[CH:2]1Participants
6
[NH:1]1[C:5]2=[N+:6]([O-])[CH:7]=[CH:8][CH:9]=[C:4]2[CH:3]=[CH:2]1.S(OC)(OC)(=O)=O.[NH3:18]>C(#N)C.CO>[NH:1]1[C:5]2=[N:6][C:7]([NH2:18])=[CH:8][CH:9]=[C:4]2[CH:3]=[CH:2]11H-Pyrrolo[2,3-b]pyridine 7-oxide, 3-chlorobenzoic acid complex (1.5 g, 5.16 mmol) was suspended in acetonitrile (10 mL). Dimethyl sulfate (0.54 mL, 5.68 mmol) was added and the reaction mixture was warmed to 60° C. After 16 h, the mixture was transferred to a thick-walled pressure tube and 7M ammonia in methanol solution (11 mL) was added. The tube was sealed and warmed to 55° C. After 16 h, the solvent was evaporated and the residue was taken up in dichloromethane and 10% sodium carbonate solution. The aqueous layer was extracted with dichloromethane, and then the combined organic layers were washed successively with saturated aqueous sodium bicarbonate solution, water and brine. The organic phase was dried (sodium sulfate), filtered, and concentrated in vacuo. Purification by chromatography (silica, 10 to 80% ethyl acetate in hexanes) gave 1H-pyrrolo[2,3-b]pyridin-6-ylamine (316 mg, 46%) as a white solid. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 8.73 (br. s., 1H) 7.70 (d, J=8.3 Hz, 1H) 6.99 (d, J=3.5 Hz, 1H) 6.38 (d, J=8.3 Hz, 1H) 6.36 (d, J=3.5 Hz, 1H) 3.82 (br. s., 2H).
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