反应详情

To N-(2,6-difluorophenyl)-3-[3-(2-{[2-methyl-4-(4-piperidinyloxy)phenyl]amino}-4-pyrimidinyl)imidazo[1,2-a]pyridin-2-yl]benzamide (Example 6) (0.098 g, 0.16 mmol) in DCM (4 mL) and MeOH (2 mL) was added acetic acid (0.20 mL, 1M in DCM, 0.20 mmol) and formaldehyde (0.024 mL, 37% weight in H2O, 0.32 mmol). Sodium triacetoxyborohydride (0.053 g, 0.25 mmol) in one portion and the reaction was stirred at rt until complete by MS. Purification by flash chromatography, followed by preparative HPLC chromatography (prep-HPLC) provided the title compound (0.044 g, 0.070 mmol, 43%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.58-1.67 (m, 2H), 1.88-1.95 (m, 2H), 2.11-2.21 (m, 8H), 2.55-2.65 (m, 2H), 4.33 (s, 1H), 6.45 (d, J=5.1 Hz, 1H), 6.81 (d, J=8.1 Hz, 2H), 6.87 (s, 2H), 7.17-7.26 (m, 3H), 7.36-7.47 (m, 2H), 7.62 (t, J=7.8 Hz, 1H), 7.71 (d, J=9.1 Hz, 1H), 7.77-7.85 (m, 1H), 8.06 (d, J=9.5 Hz, 1H), 8.18 (d, J=5.3 Hz, 1H), 8.31 (s, 1H), 8.89 (s, 1H), 9.32 (br. s., 1H). MS (M+H, ES+) 646.

1. customPurification by flash chromatography