反应详情

A solution of 192 mg (0.380 mmol) of tert-butyl 3-(4-{[(2-(2,4-dimethylphenyl)-amino-2-oxoethyl)(2-furylmethyl)amino]methyl}phenyl)-2,2-dimethylpropionate (Example 1-1) in 1 ml of dichloromethane is treated with 1 ml of trifluoroacetic acid and stirred at room temperature for 2 h. The mixture is then concentrated under reduced pressure, the residue is taken up in ethyl acetate and the organic phase is washed 2× with water, 1× with 20% strength sodium acetate solution, 1× with water and 1× with sat. NaCl solution, dried over sodium sulphate and freed from the solvent under reduced pressure. Chromatographic purification of the residue on silica gel (dichloromethane→dichloromethane/methanol 20:1) gives 150 mg (88%) of 3-(4-{[(2-(2,4-dimethylphenyl)amino-2-oxoethyl)(2-furylmethyl)amino]methyl}phenyl)-2,2-dimethylpropionic acid.

1. concentrationThe mixture is then concentrated under reduced pressure
2. washthe organic phase is washed 2× with water, 1× with 20% strength sodium acetate solution, 1× with water and 1× with sat. NaCl solution
3. dry with materialdried over sodium sulphate
4. customChromatographic purification of the residue on silica gel (dichloromethane→dichloromethane/methanol 20:1)