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(2S)-1-(2-(N-tert-Butyloxycarbonyl-N-(2-methylpropyl)amino)acetyl)pyrrolidine-2-carboxamide (330 mg, 1.01 mmol) was dissolved in dry THF (20 ml). The solution was cooled to 0° C., triethylamine (210 mg, 2.1 mmol) was added followed by the slow addition of trifluoroacetic anhydride (460 g, 2.2 mmol). The pH was adjusted to pH9 with triethylamine. After 30 min the reaction mixture was diluted with ethyl acetate (100 ml), washed with water and brine, dried (Na2SO4) and evaporated in vacuo. The residue was purified by flash chromatography (eluant: 3% methanol, 97% chloroform) to give an orange oil identified as the title compound (156 mg, 0.50 mmol, 50%).

1. washwashed with water and brine
2. dry with materialdried (Na2SO4)
3. customevaporated in vacuo
4. customThe residue was purified by flash chromatography (eluant: 3% methanol, 97% chloroform)
5. customto give an orange oil