Trifluoroacetic acid → 3,3-Dimethyl-4-{2-[4-(methyl-phenyl-carbamoyloxy)-phenyl]-ethylcarbamoyl}-butyric acid

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Reaction Steps

A solution of 3,3-dimethylglutaric anhydride (0.3 mmol), diisopropylethylamine (0.30 mmol) and N-methyl-N-phenyl-carbamic acid 4-(2-amino-ethyl)phenyl ester as its TFA salt (0.3 mmol) in CH2Cl2 (3 mL) was stirred 1 h at rt. The mixture was washed with water and brine, dried and evaporated to give the title compound in 95% yield as an oil. HPLC-MS: m/z=413.2 (M+1); Rt=3.20 min.

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