反应详情

A suspension of ethyl 1-methyl-1H-indole-2-carboxylate (27.10 g, 133.34 mmole) in 40% aqueous CH3NH2 (300 mL) and MeOH (30 mL) was stirred at RT. A solid tended to gradually creep up the walls of the flask, and was washed down periodically with MeOH. The flask was tightly stoppered to keep the material inside the flask. As the reaction proceeded, the solid dissolved, but eventually the product began to precipitate. The reaction was stirred at RT for 5 days, then was concentrated to remove approximately 200 mL of the solvent. The remaining residue was diluted with H2O (300 mL), and the solid was collected by suction filtration and washed with H2O. Drying at 50-60° C. in high vacuum left the title compound (23.45 g, 93%) as a faintly yellow solid: 1H NMR (300 MHz, CDCl3) δ 7.63 (d, J=8.0 Hz, 1 H), 7.27-7.43 (m, 2 H), 7.10-7.20 (m, 1 H), 6.80 (s, 1 H), 6.10-6.30 (m, 1 H), 4.06 (s, 3 H), 3.01 (d, J=4.9 Hz, 3 H).

1. washwas washed down periodically with MeOH
2. dissolutionthe solid dissolved
3. customto precipitate
4. stirringThe reaction was stirred at RT for 5 days
5. concentrationwas concentrated
6. customto remove approximately 200 mL of the solvent
7. additionThe remaining residue was diluted with H2O (300 mL)
8. filtrationthe solid was collected by suction filtration
9. washwashed with H2O
10. customDrying at 50-60° C. in high vacuum
11. waitleft the title compound (23.45 g, 93%) as a faintly yellow solid