Triethylamine → HCID 67999035、化合物

A solution of (S)-tert-butyl 2-((3R,5R,6S)-3-(2-amino-2-oxoethyl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-methyl-2-oxopiperidin-1-yl)butanoate (105 mg, 0.197 mmol; Example 128, Step A) and triethylamine (137 μL, 0.984 mmol) in THF (3.3 mL) was treated with 2,2,2-trifluoroacetic anhydride (69.8 μL, 0.492 mmol) at 0° C. After being stirred at 0° C. for 3 h, the reaction was quenched (10% citric acid), extracted (2×EtOAc) and washed (sat. aq. NaCl solution). The combined organic layers were dried (Na2SO4) and concentrated under reduced pressure. Purification of the residue by chromatography on silica gel (12 g SiO2, 20 to 50% EtOAc/Hex, a gradient elution) provided the title compound as a colorless foam.