Ammonium Chloride → HCID 178456049、化合物

To a solution of (S)-tert-butyl 2-((3R,5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-(cyanomethyl)-3-methyl-2-oxopiperidin-1-yl)butanoate (101 mg, 0.196 mmol; Example 128, Step B) in DMF (0.50 mL) was added sodium azide (127 mg, 1.96 mmol) and NH4Cl (105 mg, 1.96 mmol). The resulting mixture was stirred at 90° C. for 5 days. Then, the reaction was quenched (aq. 10% citric acid), extracted (2×EtOAc), and washed (3×sat. aq. NaCl solution). The combined organic layer was dried (Na2SO4) and concentrated under reduced pressure. Purification by RP-HPLC (60 to 85% AcCN/H2O, gradient elution) provided the title compound as a white solid.