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(3,5-Dimethyl-pyridin-2-ylmethyl)-(3-isopropyl-pyridin-2-ylmethyl)-piperidin-4-yl-amine (145 mg, 0.41 mmol) was dissolved in i-PrOH (4 mL) and treated with trimethylsilylisocyanate (78 μL, 0.58 mmol) at room temperature for 16 hours. The solution was then concentrated under reduced pressure and dried in vacuo. The crude material was purified by column chromatography with silica gel (15:1:0.1 CH2Cl2/MeOH/NH4OH) to give COMPOUND 301 as a colorless oil (118 mg, 73%). 1H NMR (CDCl3) δ 0.93 (d, 6H, J=6.6 Hz), 1.66 (q, 2H, J=11.1 Hz), 1.89 (br d, 2H, J=12.3 Hz), 2.17 (s, 3H), 2.28 (s, 3H), 2.68 (br t, 3H, J=12.3 Hz), 2.82 (sept, 1H, J=6.6 Hz), 3.77 (s, 2H), 3.83 (s, 2H), 4.00 (br d, 2H, J=12.6 Hz), 4.45 (br, 2H(NH2)), 7.15 (m, 1H), 7.24 (s, 1H), 7.50 (d, 1H, J=7.2 Hz), 8.19 (s, 1H), 8.32 (d, 1H, J=3.6 Hz). 13C NMR (CDCl3) δ 17.91, 18.07, 23.21 (2C), 26.93 (2C), 27.00, 44.49 (2C), 53.97 (2C), 56.89, 122.79, 131.89, 132.84, 133.47, 138.68, 144.03, 145.03, 146.26, 154.10, 155.91, 157.78. ES-MS m/z 396 (M+H). Anal. Calcd. for C23H33N5O.0.8CH2Cl2: C, 67.39; H, 8.51; N, 17.08. Found: C, 67.33; H, 8.23; N, 17.27.
