反应详情

温度

-78 °C

Referring to FIG. 37, to a solution of 2-(4-(chlorosulfonyl)-3,5-dimethylphenoxy)acetyl chloride (6 g, 20.3 mmol) in THF (60 mL) were added dropwise a solution of BnOH (2.2 g, 20.3 mmol). Et3N (3.44 mL, 24.3 mmol) and DMAP (25 mg, 0.2 mmol) in THF (30 mL) at −78° C. The reaction mixture was stirred for 5 h at −78° C. and then poured into HCl solution (1 N, 100 mL). The resulting mixture was extracted with ethyl acetate (100 mL×2). The combined extracts were washed with brine, dried over anhydrous Na2SO4 and concentrated under reduced pressure. The residue was purified by flash column chromatography (petroleum ether/EtOAc=60:1) to give product as a white powder (1.2 g, 16% yield). 2-(4-(Chlorosulfonyl)-3,5-dimethylphenoxy)acetyl chloride (2.0 g) was recovered. 1H NMR (CDCl3, 300 MHz): δ 7.42-7.32 (m, 5H), 6.67 (s, 2H), 5.32 (s, 2H), 4.74 (s, 2H) 2.72 (s, 6H).

1. customat −78° C
2. extractionThe resulting mixture was extracted with ethyl acetate (100 mL×2)
3. washThe combined extracts were washed with brine
4. dry with materialdried over anhydrous Na2SO4
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by flash column chromatography (petroleum ether/EtOAc=60:1)