p-Toluenesulfonic acid → N-(1-(4-(5,7-Dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)phenyl)piperidin-4-yl)-N-ethylacetamide

Participants

Reaction Conditions

Reaction Steps

A mixture of N-ethyl-N-(1-(4-formylphenyl)piperidin-4-yl)acetamide (0.385 g, 1.40 mmol), NaHSO3 (0.162 g, 1.50 mmol), and p-TsOH (0.024 g, 0.12 mmol) were added to a solution of 2-amino-4,6-dimethoxybenzamide (0.250 g, 1.20 mmol) in DMA (10 mL). The reaction was stirred at 150° C. for 4 hours and then cooled to room temperature overnight. The mixture was diluted with H2O and extracted with EtOAc. 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 (0.300 g, 55%) as a yellow solid. 1H NMR (300 MHz, DMSO-d6): mixture of rotamers δ 11.76 (s, 1H), 8.08 (d, J=8.7 Hz, 2H), 7.02 (d, J=8.7 Hz, 2H), 6.67 (d, J=2.0 Hz, 1H), 6.46 (d, J=2.0 Hz, 1H), 4.29-4.33 (m, 0.5H), 3.99-4.03 (m, 2H), 3.88 (s, 3H), 3.83 (5, 3H), 3.12-3.25 (m, 2H), 2.81-2.93 (m, 2H), 2.07 (s, 1.5H), 2.01 (s, 1.5H), 1.59-1.74 (m, 4.5H), 1.10 (t, J=6.7 Hz, 1.5H), 0.99 (t, J=6.7 Hz, 1.5H). ESI MS m/z 451 [M+H]+.

Provenance & Evidence