Trifluoroacetic acid → [4-(2-{[2-(Methoxycarbonyl)phenyl]thio}ethyl)phenoxy]acetic acid

Beteiligte Stoffe

Reaktionsschritte

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 acetonitile/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 was pooled and the acetonitrile was removed by evaporation. EtOAc (10 ml) was added and the organic phase was washed with two potions 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).

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