反应详情

To a solution of methyl 4-bromo-3-(methoxymethyl)benzoate, (Intermediate 28, step 2) (12 g, 0.0463 mol) in toluene (150 mL) and water (35 mL) under N2, was added 2-ethyl benzene boronic acid (9.02 g, 0.0601 mol) followed by potassium carbonate (19 g, 0.1389 mol) and Pd(PPh3)4 (2.67 g, 023). The reaction mixture was degassed with N2 for 10 min before heating. After 12 hours at 100° C., the reaction mixture was diluted with EtOAc. The organic layer was washed with sodium bicarbonate sat. solution (1×100 mL), water (2×100 mL) and finally with brine (1×100 mL). It was then dried over sodium sulphate and concentrated under reduced pressure. The residue was purified by chromatography (silica gel, 60-120 mesh, eluting with pet ether/EtOAc) to afford the title compound as a pale yellow liquid (12 g, 83%). 1H NMR (CDCl3, 400 MHz) δ 8.24-8.26 (1H, s), 7.99-8.01 (1H, d), 7.32-7.38 (2H, m), 7.22-7.27 (2H, m), 7.07-7.09 (1H, d), 4.12-4.21 (2H, d), 3.93-3.95 (3H, s), 3.28-3.30 (3H, s), 2.28-2.43 (2H, m), 1.01-1.05 (3H, t).

1. customThe reaction mixture was degassed with N2 for 10 min
2. temperaturebefore heating
3. additionthe reaction mixture was diluted with EtOAc
4. washThe organic layer was washed with sodium bicarbonate sat. solution (1×100 mL), water (2×100 mL) and finally with brine (1×100 mL)
5. dry with materialIt was then dried over sodium sulphate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by chromatography (silica gel, 60-120 mesh, eluting with pet ether/EtOAc)