反应详情

A 0° C. solution of 2-(2-chloro-4-fluoro-5-nitrophenyl)acetic acid (20.5 g, 88 mmol) in EtOH (150 mL) was treated with sulfuryl dichloride (21 g, 0.17 mol), then heated to reflux for 1 h. The reaction mixture was concentrated under reduced pressure and treated with satd. Na2CO3 to pH 7-8. The resultant mixture was extracted with EtOAc (3×) and the combined organic layers were washed with brine, dried (MgSO4) and concentrated to give ethyl 2-(2-chloro-4-fluoro-5-nitrophenyl)acetate (22.5 g, 98% yield). 1H NMR (400 Hz, DMSO-d6): δ 8.32 (d, J=8.0 Hz, 1H), 7.91 (d, J=11.2 Hz, 1H), 4.09 (q, J=7.2 Hz, 2H), 3.92 (s, 2H), 1.17 (t, J=7.2 Hz, 3H).

1. temperatureheated
2. temperatureto reflux for 1 h
3. concentrationThe reaction mixture was concentrated under reduced pressure
4. additiontreated with satd
5. extractionThe resultant mixture was extracted with EtOAc (3×)
6. washthe combined organic layers were washed with brine
7. dry with materialdried (MgSO4)
8. concentrationconcentrated