反应详情

温度

60 °C

To a suspension of methyl 4-hydroxy-3-methoxybenzoate (100 g, 0.55 mol) and K2CO3 (92 g, 0.66 mol) in DMF (800 ml) was added drop wise 3-chloro-2-methyl-propene (55 g, 0.60 mol). The mixture was stirred at 60° C. overnight. TLC (EtOAc/petroleum ether=1/3) showed no starting material was present. The reaction mixture was filtered and the filtrate was added water (400 ml). The mixture was extracted with EtOAc (400 ml×3). The combined organic phase was washed with brine (400 mL), dried (Na2SO4) and concentrated to give the product (130 g, 100%) as yellow oil. The oil was used directly to the next step without further purification. 1H NMR (400 MHz, CDCl3): δ 7.54 (d, 1H), 7.19 (s, 1H), 6.80 (d, 1H), 5.00 (d, 2H), 4.50 (s, 2H), 3.83 (d, 6H), 1.76 (s, 3H).

1. filtrationThe reaction mixture was filtered
2. additionthe filtrate was added water (400 ml)
3. extractionThe mixture was extracted with EtOAc (400 ml×3)
4. washThe combined organic phase was washed with brine (400 mL)
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated