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温度

0 °C

A solution of 1.0 M boron tribromide (44.0 ml, 44.0 mmol) in DCM (20 ml) was cooled to 0° C. 2-methoxy-4-(methylsulfonyl)benzoic acid (4.0 g, 17.4 mmol) dispergated in DCM (120 ml) was slowly added to the tribromide-solution during 20 minutes. The reaction mixture was vigorously stirred for 1.5 h at 0° C. Water was added and the organic phase was separated. The aqueous phase was extracted with DCM and EtOAc. The combined organic phases was dried (Na2SO4) and evaporated under reduced pressure to give a white powder (3.6 g). 1H-NMR (400 MHz, MeOH): δ 8.07 (1H, d, J 8.0 Hz), 7.42 (1H, d, J 2.0 Hz), δ 7.38 (1H, dd, J1 8.4 Hz, J2 1.6 Hz), δ 3.11 (3H, s).

1. customthe organic phase was separated
2. extractionThe aqueous phase was extracted with DCM and EtOAc
3. dry with materialThe combined organic phases was dried (Na2SO4)
4. customevaporated under reduced pressure