反应详情

温度

80 °C

1H-indole-6-carboxylic acid, 3-cyclohexyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-, methyl ester. (383 mg, 1.0 mmol), 2,4,5-tribromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazole (435.2 mg, 1.0 mmol) and LiCl (84 mg, 2.0 mmol) were dissolved in a mixture of ethanol (4 mL) and toluene (4 mL). An aqueous Na2CO3 solution (1M, 2.5 mL, 2.5 mmol) was added and the mixture degassed with nitrogen for 20 min. Pd(PPh3)4 (11.5 mg, 0.1 mmol) was then added and the mixture stirred at 80° C. under N2 for 3-4 h. EtOAc (6 mL) was added, followed by 20 mL of water. The organic layer was separated, dried (Na2SO4), filtered and evaporated under reduced pressure to give a residue. This was subjected to flash chromatography on silica gel ((EtOAc-Hexane 1:3) to afford 435 (71%) of the title compound as a foam. 1H NMR (300 MHz, CDCl3) δ 0.04 (s, 9H), 1.02 (t, 2H, J=8.4 Hz), 1.20-2.00 (m, 10H), 3.31 (m, 1H), 3.76 (t, 2H, J=8.4 Hz), 3.91 (s, 3H), 5.36 (s, 2H), 7.73 (dd, 1H, J=1.5, 8.5 Hz), 7.88 (d, 1H, J=8.5 Hz), 8.07 (s, 1H).

1. customthe mixture degassed with nitrogen for 20 min
2. customThe organic layer was separated
3. dry with materialdried (Na2SO4)
4. filtrationfiltered
5. customevaporated under reduced pressure
6. customto give a residue