To a solution of 2-amino benzamide (136 mg, 1.0 mmol) in N,N-dimethyl acetamide (5 mL) were added 3,5-dimethyl-4-(2-morpholin-4-yl-ethoxy)benzaldehyde (263 mg, 1.0 mmol), sodium hydrogen sulphite (58.5%) (196 mg, 1.1 mmol) and p-toluenesulfonic acid (19 mg, 0.1 mmol). The reaction mixture was stirred at 150° C. overnight. Water (40 mL) was added. The formed solid was filtered off, washed with water and a small amount of methanol and dried under vacuum to give the title compound (190 mg, 50%) as an off-white solid. To a solution of the above compound (174 mg, 0.458 mmol) in 2:1 anhydrous CH2Cl2-methanol (15 mL) was added 1.0 M solution of hydrogen chloride in ether (1.5 mL) and the reaction mixture was stirred at room temperature for 16 h. The solvent was removed under reduced pressure. The residue was triturated with 10% methanol in anhydrous ether to give the hydrochloride of 2-(3,5-dimethyl-4-(2-morpholinoethoxy)phenyl)quinazolin-4(3H)-one (187 mg, 98%), as an off-white solid. Selected data: MS (ES) m/z: 380.10; MP 300-302° C. (hydrochloride).
