反应详情

温度

110 °C

A mixture of 3-(4-chlorophenethoxy)pyrazin-2(1H)-one (25 mg, 0.100 mmol), K3PO4 (63.5 mg, 0.299 mmol), copper (1) iodide (18.99 mg, 0.100 mmol), 1-(4-bromophenoxy)-2-methylpropan-2-ol and N,N′-dimethylethylenediamine (0.032 mL, 0.299 mmol) in dioxane (1.0 mL) was stirred at 110° C. for 60 min. After removal of the precipitate by filtration, the filtrate was concentrated. The crude product was purified by silica gel chromatography employing a solvent gradient (CH2Cl2 to 10% MeOH/CH2Cl2) to elute 3-(4-chlorophenethoxy)-1-(4-(2-hydroxy-2-methylpropoxy)phenyl)pyrazin-2(1H)-one (31.82 mg, 0.073 mmol, 73.1% yield) as white solid. 1H NMR (500 MHz, chloroform-d) δ ppm 7.32 (2H, d), 7.23-7.29 (4 H, m), 7.02 (2H, d), 6.84 (2H, s), 4.51 (2H, t, J=7.29 Hz), 3.83 (2H, s), 3.13 (2H, t, J=7.15 Hz), 1.36 (6H, s).

1. customAfter removal of the precipitate
2. filtrationby filtration
3. concentrationthe filtrate was concentrated
4. customThe crude product was purified by silica gel chromatography