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With potassium carbonate In toluene at 115℃; for 12h;
55
2-(4-bromo-2-methoxyphenoxy)ethanol (8a): Potassium carbonate (1.4 g, 10 mmol) was added to a solution of ethylene carbonate (1.8 g, 20 mmol) and 4-bromo-2-methoxyphenol (1.05 g, 5 mmol) in 5 mL of toluene under an inert atmosphere. The reaction was heated at 115° C. for 12 h. Water (50 mL) and ethyl acetate (2*100 mL) were added to the reaction mixture to stir. The organic layers were combined, dried, filtered, and evaporated to get a yellow oil residue. The residue was purified by flash chromatography (eluding with 40→45% EtOAc in hexanes) to give compound 8a as a light brown yellow oil (1 g; 4.13 mmol; 82.6% yield); MS (APCI) (M+H)+246. 1H NMR (400 MHz, chloroform-D) δ ppm 2.83 (t, J=6.3 Hz, 1H) 3.84 (s, 3H) 3.89-4.01 (m, 2H) 4.03-4.13 (m, 2H) 6.78 (d, J=8.3 Hz, 1H) 6.99 (d, 1H) 7.02 (d, 1H).
82.6%
With potassium carbonate In toluene at 115℃; for 12h;
55
Potassium carbonate (1.4 g, 10 mmol) was added to a solution of ethylene carbonate (1.8 g, 20 mmol) and 4-bromo-2-methoxyphenol (1.05 g, 5 mmol) in 5 mL of toluene under an inert atmosphere. The reaction was heated at 115°C for 12 h. Water (50 mL) and ethyl acetate (2 x 100 mL) were added to the reaction mixture to stir. The organic layers were combined, dried, filtered, and evaporated to get a yellow oil residue. The residue was purified by flash chromatography (eluting with 40-»45% EtOAc in hexanes) to give compound 8a as a light brown yellowoil (1 g; 4.13 mmol; 82.6% yield); MS (APCI) (M+H)+ 246. 1H NMR (400 MHz, chloroform-D) Q ppm 2.83 (t, J=6.3 Hz, 1 H) 3.84 (s, 3 H) 3.89 - 4.01 (m, 2 H) 4.03 - 4.13 (m, 2 H) 6.78 (d, J=8.3 Hz, 1 H) 6.99 (d, 1 H) 7.02 (d, 1 H).