p-Toluenesulfonic acid → HCID 135939118, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-(4-acetyl-3-methylpiperazin-1-yl)benzaldehyde (0.400 g, 1.62 mmol) in DMA (15 mL) was added 2-amino-4,6-dimethoxybenzamide (0.349 g, 1.78 mmol), NaHSO3 (0.201 g, 1.94 mmol) and p-TsOH (0.030 g, 0.16 mmol). The resulting solution was heated to 155° C. for 5 hours. The mixture was cooled to room temperature, diluted with water, extracted with CH2Cl2, washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo. The material was purified by flash chromatography on silica gel, eluting with 50% to 100% of 92:7:1 CHCl3/MeOH/concentrated NH4OH in CH2Cl2, to afford the title compound (0.150 g, 21%). 1H NMR (300 MHz, DMSO-d6): mixture of rotamers δ 11.57 (s, 1H), 8.10 (d, J=8.9 Hz, 2H), 6.90-7.14 (m, 2H), 6.68 (s, 1H), 6.46 (s, 1H), 4.42-4.75 (m, 0.5H), 4.03-4.42 (m, 1H), 3.61-4.02 (m, 8H), 3.41-3.60 (m, 1H), 2.85-3.13 (m, 2H), 2.63-2.85 (m, 0.5H), 1.88-2.13 (m, 3H), 1.04-1.31 (m, 3H). ESI MS m/z 423 [M+H]+.

Provenance & Evidence