A mixture of 4-(4-isopropylpiperazin-1-yl)benzaldehyde (0.562 g, 2.40 mmol), NaHSO3 (0.310 g, 2.90 mmol), and p-TsOH (0.046 g, 0.24 mmol) was added to a solution of 2-amino-3-methoxybenzamide (0.400 g, 2.40 mmol) in DMA (15 mL). The reaction was stirred at 120° C. overnight. The mixture was diluted with H2O and saturated NaHCO3 and extracted with CH2Cl2. The organics were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. Purification by flash chromatography on silica gel eluting with 0% to 10% MeOH/CH2Cl2 afforded the title compound (0.140 g, 15%). 1H NMR (300 MHz, DMSO-d6): δ 12.27 (s, 1H), 8.10 (d, J=8.9 Hz, 2H), 7.64-7.70 (m, 1H), 7.31-7.39 (m, 2H), 7.03 (d, J=9.1 Hz, 2H), 3.93 (s, 3H), 3.27-3.32 (m, 4H), 2.64-2.75 (m, 1H), 2.56-2.59 (m, 4H), 1.00 (d, J=6.6 Hz, 6H). ESI MS m/z 379 [M+H]+.
