Dimethylcarbamoyl Chloride → 3-(1-(4-(5,7-Dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)phenyl)piperidin-4-yl)-1,1-dimethylurea

Participants

Reaction Steps

A mixture of 2-(4-(4-aminopiperidin-1-yl)phenyl)-5,7-dimethoxyquinazolin-4(3H)-one (0.105 g, 0.28 mmol), dimethylcarbamic chloride (0.032 g, 0.30 mmol), and Et3N (0.085 g, 0.84 mmol) in THF (10 mL) was stirred at room temperature for 18 hours. The mixture was then heated at reflux for 24 hours, then cooled to room temperature. 2 M NaOH (20 mL) was added and the mixture was stirred for 30 minutes. The reaction mixture was adjusted to pH 8, extracted with CH2Cl2 (3×100 mL), dried over anhydrous MgSO4, filtered, and concentrated. The residue was dissolved in CHCl3/MeOH and concentrated, then CH3CN was added and concentrated to afford the title compound as a white solid (0.065 g, 51%): 1H NMR (300 MHz, CDCl3): δ 11.72 (s, 1H), 8.08 (d, J=9.0 Hz, 2H), 7.00 (d, J=9.0 Hz, 2H), 6.78 (d, J=2.2 Hz, 1H), 6.46 (d, J=2.2 Hz, 1H), 5.99 (d, J=7.8 Hz, 1H), 3.90-3.94 (m, 2H), 3.88 (s, 3H), 3.83 (s, 3H), 3.66-3.69 (m, 1H), 2.88-2.93 (m, 2H), 2.76 (s, 6H), 1.75-1.80 (m, 2H), 1.45-1.52 (m, 2H); ESI MS m/z 452 [M+H]+.

Provenance & Evidence