反应详情

温度

120 °C

A mixture of 5-bromo-2-chloro-4-ethoxypyridine (8 g, 33.8 mmol), Cs2CO3 (33.1 g, 101 mmol) and (4-methoxyphenyl)methanol (5.37 g, 38.9 mmol) in DMF (100 mL) was stirred at 120° C. for 12 h. The mixture was then concentrated. The residue was added to DCM (150 mL). The mixture was filtered and the filtrate was concentrated. The crude material was purified by silica column chromatography (PE/EA=8:1). All fractions found to contain product by TLC (PE/EA=5:1, Rf=0.4) were combined and concentrated to yield a yellow solid of 5-bromo-4-ethoxy-2-((4-methoxybenzyl)oxy)pyridine (5 g, 12.57 mmol, 37% yield): 1H NMR (400 MHz, CDCl3) δ: 8.05 (s, 1H), 7.32 (d, J=8.8 Hz, 1H), 6.84 (d, J=8.4 Hz, 1H), 6.17 (s, 1H), 5.18 (s, 2H), 4.02 (q, J=6.8 Hz, 2H), 3.74 (s, 3H), 1.40 (t, J=7.2 Hz, 3H); ES-LCMS m/z 338 (M+H).

1. concentrationThe mixture was then concentrated
2. additionThe residue was added to DCM (150 mL)
3. filtrationThe mixture was filtered
4. concentrationthe filtrate was concentrated
5. customThe crude material was purified by silica column chromatography (PE/EA=8:1)
6. concentrationconcentrated