p-Toluenesulfonic acid → 2-(2,6-Dimethylpyridin-4-yl)-6-(2-(pyrrolidin-1-yl)ethyl)quinazolin-4(3H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-amino-5-(2-pyrrolidin-1-yl-ethyl)-benzamide (0.16 g, 0.69 mmol) in N,N-dimethyl acetamide (7 mL) under a nitrogen atmosphere was added 2,6-dimethyl-pyridine-4-carbaldehyde (0.09 g, 0.68 mmol), followed by sodium hydrogensulfite (0.14 g, 1.36 mmol) and p-toluenesulfonic acid (0.32 g, 1.7 mmol). The resulting mixture was heated at 120° C. overnight. Then, the solvent was removed under reduced pressure, the residue was diluted with ethyl acetate, and was extracted with water. The pH of the water layer was made basic by adding sodium bicarbonate, then the layer was extracted with methylene chloride, dried over anhydrous sodium sulfate, and was evaporated under high vacuum. The crude yellow solid (0.09 g) was purified by column chromatography (silica gel 230-400 mesh; 95/5 methylene chloride/MeOH as eluent) to afford the title compound as a yellow solid. Yield: 54 mg (23%). MP 212.3-213.2° C. 1H NMR (400 MHz, CDCl3): δ 8.19 (s, 1H), 8.19 (br s, 1H), 7.83-7.77 (m, 1H), 7.76-7.70 (m, 3H), 3.0-3.15 (m, 2H), 2.78-2.88 (m, 2H), 2.7 (s, 6H), 2.58-2.68 (m, 4H), 1.8-1.95 (m, 4H). MS (ES+) m/z: 347.11 (M+1).

Provenance & Evidence