反応手順
Following the same procedure in Example 3, Step A, using (2R,6S)-2,6-dimethylmorpholine (34.6 mg, 0.30 mmol), diisopropylethylamine (69.7 μL, 51.7 mg, 0.40 mmol) and a solution of 1-(cyclohexylmethyl)-2-(1,1-dimethylpropyl)-1H-benzimidazole-5-carboxylic acid (65.9 mg, 0.20 mmol) (for preparation, see in Example 4, Step E) in DMF (5 mL) at 0° C., and later, HATU (91.3 mg, 0.24 mmol). The mixture was stirred overnight at room temperature, added H2O (50 mL), extracted with EtOAc (3×50 mL). The desired title compound was purified by MPLC (hex/EtOAc 1:1 as eluent on silica gel) to give 75.7 mg (89%) of a white solid. 1H NMR (400 MHz, CD3OD): δ 0.86 (t, J=7.52 Hz, 3 H), 1.04 (m, 3 H), 1.28 (m, 8 H), 1.66 (m, 2 H), 1.69 (s, 6 H), 1.71 (m, 1 H), 1.79 (m, 2 H), 2.04 (q, J=7.42 Hz, 2 H), 2.13 (m, 1 H), 2.63 (m, 1 H), 2.92 (m, 1 H), 3.58 (m, 3 H), 4.50 (d, J=7.62 Hz, 2H), 4.55 (m, 1 H), 7.65 (dd, J=8.69, 1.46 Hz, 1 H), 7.81 (d, J=0.78 Hz, 1 H), 8.01 (d, J=8.79 Hz, 1 H). MS (ESI) (M+H)+=426.2. Anal. Calcd for C26H39N3O2+1.60 TFA+0.30 H2O (613.46): C, 57.17; H, 6.77; N, 6.85. Found: C, 57.18; H, 6.69; N, 6.88.
