反应详情

Methyl 2-({2-[4-(2-tert-butoxy-2-oxoethoxy)phenyl]ethyl}thio)benzoate (4.630 g, 11.502 mmol) was take up in DCM (50 ml) and treated with trifluoroacetic acid (44.40 g, 389.405 mmol) at r.t for 4 h. The mixture was evaporated and azeotroped with toluene. The crude was purified by preparative HPLC (started with isocratic acetonitrile/buffer 60/40 and then the acetonitrile concentration was increased to 100%, the buffer was a mixture of acetonitrile/water 10/90 and ammonium acetate (0.1 M, column KR-100-7-C8, 50 mm×250 mm, flow 40 ml/min). The product containing fractions were pooled and the acetonitrile was removed by evaporation. EtOAc (10 ml) was added and the organic phase was washed with two portions of brine and dried (MgSO4). The solvent was removed by evaporation to give 3.825 g of [4-(2-{[2-(methoxycarbonyl)phenyl]thio}ethyl)-phenoxy]acetic acid (yield for two steps 63.9% overall).

1. customThe mixture was evaporated
2. customazeotroped with toluene
3. customThe crude was purified by preparative HPLC (
4. concentrationthe acetonitrile concentration
5. temperaturewas increased to 100%
6. additiona mixture of acetonitrile/water 10/90 and ammonium acetate (0.1 M, column KR-100-7-C8, 50 mm×250 mm, flow 40 ml/min)
7. additionThe product containing fractions
8. customthe acetonitrile was removed by evaporation
9. additionEtOAc (10 ml) was added
10. washthe organic phase was washed with two portions of brine
11. dry with materialdried (MgSO4)
12. customThe solvent was removed by evaporation