反应详情

Methylamine (0.34 mL, 8.4 mmol, 33% in ethanol) was added to a solution of 3-methylindole-2-carboxaldehyde (447 mg, 2.8 mmol) in methanol (10 mL) and stirred for 5 hours. Sodium borohydride (104 mg, 2.8 mmol) was slowly added at 0° C. The resultant mixture was warmed to room temperature and stirred overnight. Water (2 mL) was added slowly at 0° C. and the mixture was evaporated to a paste. The paste was partitioned between water (2 mL) and dichloromethane (15 mL). The layers were separated and the aqueous layer was extracted with dichloromethane (2×15 mL). The combined organic phases were dried and evaporated to afford title compound (348 mg, 71%). NMR (400 MHz, DMSO-d6): 10.63 (s, 1H), 7.38 (d, J=7.7 Hz, 1H), 7.25 (d, J=8.0 Hz, 1H), 6.99 (t, J=8.0 Hz, 1H), 6.92 (t, J=6.6 Hz, 1H), 3.73 (s, 2H), 2.25 (s, 3H), 2.19 (s, 3H).

1. stirringstirred overnight
2. customthe mixture was evaporated to a paste
3. customThe paste was partitioned between water (2 mL) and dichloromethane (15 mL)
4. customThe layers were separated
5. extractionthe aqueous layer was extracted with dichloromethane (2×15 mL)
6. customThe combined organic phases were dried
7. customevaporated