A mixture of 2-(5-bromomethyl-3,4-dihydro-1H-isoquinolin-2-yl)-6,7-dimethoxy-3H-quinazolin-4-one 23a (54 mg, 0.12 mmol), morpholine (12 mg, 0.13 mmol) and sodium bicarbonate (16 mg, 0.18 mmol) in dimethyl sulfoxide (0.5 mL) was heated to 80° C. with stirring for 18 h. After cooling to room temperature, water (2 mL) was added and the precipitated product was separated by filtration, rinsed with water and dried. 6,7-Dimethoxy-2-(5-morpholin-4-ylmethyl-3,4-dihydro-1H-isoquinolin-2-yl)-3H-quinazolin-4-one 701 was purified by flash chromatography eluting with 2% methanol in dichloromethane containing 0.2% of ammonium hydroxide. The product was converted to the hydrochloric acid salt. Yield 15 mg, mp. 227.9–229.6° C., [M+H]+=437.
