反应详情

温度

50 °C

1,1′-Carbonyldiimidazole (1.17 g, 7.2 mmol) was added to a stirred solution of 2-bromo-3-cyclohexyl-1H-indole-6-carboxylic acid (2.03 g, 6.3 mmol) in THF (6 mL) at 22° C. The evolution of CO2 was instantaneous and when it slowed the solution was heated at 50° C. for 1 hr and then cooled to 22° C. N,N-Dimethylsulfamide (0.94 g, 7.56 mmol) was added followed by the dropwise addition of a solution of DBU (1.34 g, 8.8 mmol) in THF (4 mL). Stirring was continued for 24 hr. The mixture was partitioned between ethyl acetate and dilute HCl. The ethyl acetate layer washed with water followed by brine and dried over Na2SO4. The extract was concentrated to dryness to leave the title product as a pale yellow friable foam, (2.0 g, 74%, >90% purity, estimated from NMR). 1H NMR (300 MHz, DMSO-D6) δ ppm 1.28-1.49 (m, 3H) 1.59-2.04 (m, 7H) 2.74-2.82 (m, 1H) 2.88 (s, 6H) 7.57 (dd, J=8.42, 1.46 Hz, 1H) 7.74 (d, J=8.78 Hz, 1H) 7.91 (s, 1H) 11.71 (s, 1H) 12.08 (s, 1H).

1. temperaturecooled to 22° C
2. customThe mixture was partitioned between ethyl acetate and dilute HCl
3. washThe ethyl acetate layer washed with water
4. dry with materialdried over Na2SO4
5. concentrationThe extract was concentrated to dryness