Sodium hydride (oily, 60%, 0.129 g) was added to a solution of diphenylamine (0.497 g) in N,N-dimethylformamide (10 ml), and the mixture was stirred at room temperature for 20 minutes. Then, 2-chloromethyl-4-(3,4-dimethoxyphenyl)-6,7-dimethoxyquinazoline (1.0 g) was added, and the mixture was stirred at 100° C. for 4 hours. The reaction mixture was poured into water, and extracted with ethyl acetate. The ethyl acetate layer was washed with water, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was subjected to column chromatography on silica gel. The fractions eluted with ethyl acetate - hexane (1:1, v/v) gave 2-(N,N-diphenylaminomethyl)-4-(3,4-dimethoxyphenyl)-6,7-dimethoxyquinazoline (0.27 g, 20%). This compound was recrystallized from ethyl acetate - hexane. Colorless prisms, mp. 215°-216° C.
