反应详情

A solution of 2-(4-trifluoromethylphenyl)-ethanol (570 mg, 3.0 mmol) in pyridine (6 mL) was stirred on an ice/acetone bath and treated with p-toluenesulfonyl chloride (630 mg, 3.3 mmol). The cooling bath was replaced with an ice/water bath and the mixture was stirred for 3.5 hours. Ice-cold water (12 mL) was added slowly, and the mixture was extracted three times with chloroform. The combined organic phases were washed with water, then with cold 1.0 N aqueous sulfuric acid until the wash phase was acidic. The organic phase was dried over sodium sulfate and concentrated to provide a white solid (826 mg) which contained about 10% by weight of residual alcohol. This was used without further purification. 1H NMR (300 MHz, CDCl3) for toluenesulfonate: δ7.65 (d, J=8 Hz, 2H), 7.50 (d, J=8 Hz, 2H), 7.26 (d, J=8 Hz, 2H), 7.23 (d, J=8 Hz, 2H), 4.26 (t, J=7 Hz, 2H), 3.02 (t, J=7 Hz, 2H), 2.44 (s, 3H).

1. customThe cooling bath was replaced with an ice/water bath
2. extractionthe mixture was extracted three times with chloroform
3. washThe combined organic phases were washed with water
4. dry with materialThe organic phase was dried over sodium sulfate
5. concentrationconcentrated