反应详情

温度

110 °C

To a magnetically stirred solution of 3-chloro-5-hydroxybenzaldehyde (2.0 g, 12.8 mmol; see Example 1(ii) above) and potassium carbonate (2.3 g, 16.6 mmol) in DMF (35 mL) under nitrogen was added 2,2,2-trifluoroethyl p-toluenesulfonate (4.2 g, 16.6 mmol) at room temperature. The mixture was heated to 110° C. for 7 h and then stirred overnight at room temperature. The reaction was cooled to 0° C., poured into ice-cold 2 N HCl (100 mL) and extracted with EtOAc (2×75 mL). The combined organic extracts were washed with 0.5 N HCl (2×50 mL), dried (Na2SO4), filtered, and concentrated in vacuo. The brown oil was chromatographed on silica gel eluting with Hex:EtOAc (6:1) to afford the sub-title compound (1.9 g, 61%) as a yellow oil.

1. temperatureThe reaction was cooled to 0° C.
2. extractionextracted with EtOAc (2×75 mL)
3. washThe combined organic extracts were washed with 0.5 N HCl (2×50 mL)
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe brown oil was chromatographed on silica gel eluting with Hex