Trifluoroacetic acid → 2-Methyl-2-{[4-(4-trifluoromethyl-benzyloxy)-benzo[b]thiophene-5-carbonyl]-amino}-propionic acid

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113 mg of 2-Methyl-2-{[4-(2-phenoxy-ethoxy)-benzo[b]thiophene-5-carbonyl]-amino}-propionic acid tert-butyl ester were dissolved in 2 ml dichloromethane and treated with 1 ml trifluoroacetic acid. After 6h at room temperature the volatiles were evaporated. The residue was treated with ethanol and 2 M HCl and evaporated three times. The resulting residue was crystallized from diethylether/heptane to afford 50 mg of 2-Methyl-2-{[4-(4-trifluoromethyl-benzyloxy)-benzo[b]thiophene-5-carbonyl]-amino}-propionic acid.

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