反应详情

To a solution of ethyl2-(4-(ethylsulfonyl)phenyl)acetate (10.0 g, 39 mmol) in EtOH (100 mL) was added a solution of NaOH (5.7 g, 142.5 mmol) in water (100 mL). The reaction mixture was stirred at rt for 16 h. EtOH was removed under reduced pressure. The aqueous layer was adjusted to pH=1 with 6 N aq. HCl and extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with brine (2×100 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to give the desired product 2-(4-(ethylsulfonyl)phenyl)acetic acid (7.3 g, 82%) as a white solid. LC-MS tR=0.573 min in 5-95AB—1.5 min chromatography (Welch Xtimate C18, 2.1*30 mm, 3 um), MS (ESI) m/z 228.8 [M+H]+. 1H NMR (CDCl3 400 MHz): δ 7.88 (d, J=8.0 Hz, 2H), 7.50 (d, J=8.4 Hz, 2H), 3.77 (s, 2H), 3.12 (q, J=7.6 Hz, 2H), 1.28 (t, J=7.6 Hz, 3H).

1. customEtOH was removed under reduced pressure
2. extractionextracted with ethyl acetate (3×100 mL)
3. washThe combined organic layers were washed with brine (2×100 mL)
4. dry with materialdried over anhydrous Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure