Acetic Acid → HCID 178433639, compound

Participants

Reaction Steps

To a stirred mixture of 7-(3-aminophenyl)-2-(4-chlorophenyl)-2,5-dihydro-6-methylpyrazolo[4,3-c]pyridin-3-one (0.100 g, 0.285 mmol), 3-pyridinecarboxaldehyde (32.3 ml, 0.342 mmol), and acetic acid (65.5 ml, 1.14 mmol) in anhydrous methanol (4 ml) under nitrogen was added sodium cyanoborohydride (21.5 mg, 0.342 mmol) and the mixture was stirred for 3 h. The mixture was quenched with saturated aqueous K2CO3 (0.5 ml) and the solvent was removed in vacuo. The residue was purified by flash chromatography (silica gel, 5-10% MeOH/CH2Cl2) to give 0.1162 g (93%) of the title compound as a yellow solid; mp 284-287° C. (CH2Cl2-MeOH-EtOAc); 1H NMR (360 MHz, DMSO-d6) δ2.13 (3H, s), 4.34 (2H, d, J 6.1 Hz), 6.39 (1H, t, J 6.1 Hz), 6.64-6.68 (3H, m), 7.17 (1H, t, J 7.7 Hz), 7.35 (1H, dd, J 7.9, J′4.9 Hz), 7.42 (2H, d, J9.0 Hz), 7.77 (1H, dt), 8.11 (2H, d, J 9.0 Hz), 8.44 (1H, m), 8.51 (1H, s), 8.61 (1H, s), 12.34 (1H, br s); MS (ES+) m/z 442/444[MH]+, 221/222[(M2H)/2]+. Anal. found: C, 67.08; H, 4.50; N, 15.54. C25H20ClN5O.0.3H2O requires: C, 67.13; H, 4.64; N, 15.66%.

Provenance & Evidence