p-Toluenesulfonic acid → 2-(4-((4-Isopropylpiperazin-1-yl)methyl)phenyl)-5,7-dimethoxyquinazolin-4(3H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-((4-isopropylpiperazin-1-yl)methyl)benzaldehyde (0.240 g, 0.97 mmol), NaHSO3 (0.155 g, 1.50 mmol), and p-TsOH (0.019 g, 0.10 mmol) was added to a solution of 2-amino-4,6-dimethoxybenzamide (0.190 g, 0.97 mmol) in DMA (7 mL). The reaction was stirred at 130° C. overnight. Then, the mixture was diluted with H2O and extracted with CH2Cl2. The organics were washed with brine, dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. Purification by flash chromatography on silica gel, eluting with 2% to 10% MeOH/CH2Cl2, afforded the title compound (0.122 g, 30%) as a light yellow solid. 1H NMR (300 MHz, DMSO-d6): δ 12.02 (s, 1H), 8.12 (d, J=8.0 Hz, 2H), 7.43 (d, J=8.0 Hz, 2H), 6.74 (s, 1H), 6.53 (s, 1H), 3.89 (s, 3H), 3.85 (s, 3H), 3.51 (s, 2H), 2.54-2.71 (m, 1H), 2.27-2.44 (m, 8H), 0.95 (d, J=6.4 Hz, 6H). ESI MS m/z 423 [M+H]+.

Provenance & Evidence