反应详情

To a 100 ml round bottom flask was added methyl 6-bromo-1-(1-methylethyl)-1H-indole-4-carboxylate (1.100 g, 3.71 mmol) as a solution in THF and a magnetic stir bar. To the same was added 1-chloro-2,5-pyrrolidinedione (0.546 g, 4.09 mmol) and the system stirred at room temperature overnight. The solvent was removed under reduced pressure and the residue dissolved in EtOAc (60 ml) and washed with saturated NaHCO3 (20 ml) and brine (8 ml). The organic layer was dried over Na2SO4, filtered and concentrated. Purification of the residue by column chromatography provided methyl 6-bromo-3-chloro-1-isopropyl-1H-indole-4-carboxylate (as a thick gold oil), which was used in the next step. 1H NMR (400 MHz, DMSO-d6) δ 8.15 (d, J=1.52 Hz, 1H), 7.93 (s, 1H), 7.50 (d, J=1.77 Hz, 1H), 4.90 (quin, J=6.63 Hz, 1H), 3.89 (s, 3H), 1.43 (d, J=6.57 Hz, 6H). MS(ES) [M+H]+ 332.2.

1. customThe solvent was removed under reduced pressure
2. dissolutionthe residue dissolved in EtOAc (60 ml)
3. washwashed with saturated NaHCO3 (20 ml) and brine (8 ml)
4. dry with materialThe organic layer was dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customPurification of the residue by column chromatography