反应详情

Bis-(4-chloro-phenyl)-acetic acid (4.33 g, 15.4 mmol) was suspended in anhydrous methanol (20 mL) and concentrated hydrochloric acid (5 drops) was added. After 1 day the reaction was quenched by the addition of saturated sodium bicarbonate solution, then the organic solvent was removed in vacuo. The residue was partitioned between ethyl acetate and 50% saturated potassium carbonate solution. The organic phase was washed with brine, dried (MgSO4), filtered and concentrated to give a residue which was purified by column chromatography (SiO2), eluting with 10% ethyl acetate/petrol, to afford the title compound as a colourless oil (3.57 g, 78%); LCMS (PS-B3) Rt 3.79 min, No ionisation. 1H NMR (CDCl3) δ 3.74 (3H, s), 4.96 (1H, s), 7.20-7.23 (4H, m), 7.28-7.32 (4H, m).

1. customAfter 1 day the reaction was quenched by the addition of saturated sodium bicarbonate solution
2. customthe organic solvent was removed in vacuo
3. customThe residue was partitioned between ethyl acetate and 50% saturated potassium carbonate solution
4. washThe organic phase was washed with brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated
8. customto give a residue which
9. customwas purified by column chromatography (SiO2)
10. washeluting with 10% ethyl acetate/petrol