Reaction Steps
A mixture of the (3,5-dimethyl-pyridin-2-ylmethyl)-(3-isopropyl-pyridin-2-ylmethyl)-piperidin-4-yl-amine (211 mg, 0.60 mmol), 1H-benzimidazole-2-carboxylic acid (107 mg, 0.66 mmol), HOBT (97 mg, 0.72 mmol), EDCI (142 mg, 0.72 mmol), and DIPEA (142 mg, 0.72 mmol) in DMF (5 mL) was stirred at room temperature overnight. The mixture was then diluted with CH2Cl2 (25 mL) and saturated NaHCO3 (3×20 mL). The organic layer was dried (MgSO4), filtered, and concentrated to afford a yellow oil. Purification by radial chromatography on silica gel (2 mm plate; using CH2Cl2/MeOH/NH4OH; 100:1:1→25:1:1) afforded the product as a white foam (160 mg, 54%). 1H NMR (CDCl3) δ 0.93 (t, 2H, J=6.9 Hz), 1.69-1.92 (m, 2H), 2.09 (br t, 3H, J=14.7 Hz), 2.18 (s, 3H), 2.27 (s, 3H), 2.68-2.83 (m, 2H), 2.87-2.94 (m, 1H), 3.04-3.13 (m, 1H), 3.79 (d, 2H, J=5.1 Hz), 3.86 (s, 2H), 4.94 (d, 1H, J=13.5 Hz), 6.16 (d, 1H, J=12.9 Hz), 7.15 (dd, 1H, J=7.8, 4.8 Hz), 7.25 (s, 1H), 7.31 (d, 2H, J=3.9 Hz), 7.50 (d, 2H, J=6.6 Hz), 7.82 (br s, 1H), 8.19 (s, 1H), 8.34 (dd, 1H, J=4.7, 1.2 Hz). 13C NMR (CDCl3) δ 18.31, 18.53, 23.60, 23.68, 27.35, 27.42, 28.66, 44.20, 47.20, 54.34, 57.35, 112.35, 121.26, 123.22, 125.11, 132.31, 133.26, 133.61, 133.92, 139.10, 143.52, 144.45, 145.85, 146.09, 146.64, 154.45, 156.28, 159.23. ES-MS m/z 497 [M+H]+. Anal. Calcd. for C30H36N6O.0.8CH2Cl2: C, 65.52; H, 6.71; N, 14.88. Found: C, 65.54; H, 6.62; N, 15.11.
