反应详情

温度

-40 °C

Trifluoromethane sulfonic anhydride (32.2 mmol) was added dropwise over 5 minutes to a −40° C. pyridine (70 mL) solution of (4-hydroxy-phenyl)-acetic acid methyl ester (5.35 g, 32.2 mmol). The reaction was stirred at −40° C. for 10 minutes and then at 0° C. for 2 hours. The reaction was diluted with diethyl ether and washed with water and 2N hydrochloric acid. The organic portion was dried over magnesium sulfate and concentrated in vacuo. The crude residue was chromatographed on a Biotage Flash 40M column eluting with ethyl acetate/hexanes (1:4) to provide the title compound as a clear, colorless oil, which crystallized upon standing 9.27 g, 97%). 1H NMR (400 MHz, CDCl3) δ7.37-7.34 (m, 2H), 7.24-7.21 (m, 2H), 3.70 (3H), 3.64 (2H).

1. waitat 0° C. for 2 hours
2. washwashed with water and 2N hydrochloric acid
3. dry with materialThe organic portion was dried over magnesium sulfate
4. concentrationconcentrated in vacuo
5. customThe crude residue was chromatographed on a Biotage Flash 40M column
6. washeluting with ethyl acetate/hexanes (1:4)