反应详情

温度

85 °C

To a solution of 2-[2-(2-bromo-6-nitrophenoxy)ethoxy]tetrahydropyran (12.30 g, 35.6 mmol) in 1,2-dimethoxyethane (150 ml) and water (75 ml) was added sodium hydrogen carbonate (9.74 g, 117.0 mmol) and tetrakis(triphenylphosphine)palladium (4.52 g, 3.91 mmol) and the mixture was heated at 85° C. for 15 min. Methyl 3-cyclohexyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole-6-carboxylate (16.40 g, 35.6 mmol) was added in 6 divided portions to the reaction mixture at 30 min intervals, and the mixture was stirred at the same temperature for 1 hr. The reaction mixture was allowed to cool to room temperature, water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The organic layer was successively washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine and dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography (hexane:ethyl acetate=3.5:1) to give methyl 3-cyclohexyl-2-{3-nitro-2-[2-(tetrahydropyran-2-yloxy)ethoxy]phenyl}-1H-indole-6-carboxylate (14.40 g, yield 77%).

1. temperatureto cool to room temperature
2. extractionthe mixture was extracted with ethyl acetate
3. washThe organic layer was successively washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationAfter filtration
6. customthe solvent was evaporated under reduced pressure
7. customthe residue was purified by silica gel chromatography (hexane:ethyl acetate=3.5:1)