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With aluminum (III) chloride In nitromethane; 1,2-dichloro-ethane at 0℃; for 1 h; Inert atmosphere
To a solution of 1 /-/-pyrrolo[2,3-c]pyridine (0.400 g; 3.386 mmol) in a mixture of 1 ,2- dichloroethane (10 mL) and nitromethane (10 mL) cooled at 0 °C under an argon atmosphere were added dichloro(methoxy)methane (1.544 mL; 16.92 mmol) and aluminum trichloride (1.500 g; 1 1.25 mmol) over 1 h. After the addition, the reaction was quenched by addition of water and of a saturated sodium bicarbonate solution. The reaction mixture was extracted with a solution of dichloromethane and ethanol (9/1 , 6x100 mL). The combined organic layers were washed with brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure to yield 0.295 g (60percent) of 1 H-pyrrolo[2,3-c]pyridine-3-carbaldehyde which was used without further purification. ESI/APCI(+): 147 (M+H). ESI/APCI(-): 145 (M-H). 1H NMR (DMSO- ofe) δ 10.01 (1 H, s); 8.88 (1 H, s); 8.50 (1 H, s); 8.33 (1 H, d); 8.00 (1 H, d).
General procedure: To a solution of an appropriate indole, azaindole or alternative heterocycles (1.0 eq) and di-ferf-butyl dicarbonate (1eq. to 2 eq., more in particular 1.2 eq) in acetonitrile was added DMAP (0.1 to 0.5 eq. more in particular 0.1 eq). The reaction mixture was stirred overnight at room temperature. The reaction mixture was concentrated under reduced pressure. The residue was dissolved in dichloromethane and washed with a saturated sodium bicarbonate solution. The phases were separated. The aqueous phase was extracted with dichloromethane. The organic phases were combined, washed with a saturated ammonium chloride solution, water and brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The BOC-protected compound was used in the next step without further purification.
With aluminum (III) chloride; In nitromethane; 1,2-dichloro-ethane; for 1.0h;Inert atmosphere;
To a solution of 1 /-/-pyrrolo[2,3-c]pyridine (0.400 g; 3.386 mmol) in a mixture of 1 ,2- dichloroethane (10 mL) and nitromethane (10 mL) cooled at 0 C under an argon atmosphere were added dichloro(methoxy)methane (1.544 mL; 16.92 mmol) and aluminum trichloride (1.500 g; 1 1.25 mmol) over 1 h. After the addition, the reaction was quenched by addition of water and of a saturated sodium bicarbonate solution. The reaction mixture was extracted with a solution of dichloromethane and ethanol (9/1 , 6x100 mL). The combined organic layers were washed with brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure to yield 0.295 g (60%) of 1 H-pyrrolo[2,3-c]pyridine-3-carbaldehyde which was used without further purification. ESI/APCI(+): 147 (M+H). ESI/APCI(-): 145 (M-H). 1H NMR (DMSO- ofe) delta 10.01 (1 H, s); 8.88 (1 H, s); 8.50 (1 H, s); 8.33 (1 H, d); 8.00 (1 H, d).
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