Acetic Acid → N-(2,6-difluorophenyl)-3-{3-[2-({2-methyl-4-[(1-methyl-4-piperidinyl)oxy]phenyl}amino)-4-pyrimidinyl]imidazo[1,2-a]pyridin-2-yl}benzamide

Participants

Reaction Steps

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.

Provenance & Evidence