In reactions of 2-methyl-3-amino-4(3H)-quinazolinone with 4-methoxy-, 2,4-dimethoxy-, 2,5-dimethoxy-, 2,3,4-trimethoxy-, 2,4,5-trimethoxy-, 3,4,5-trimethoxy-, 2-hydroxy-3-methoxybenzaldehydes, heliotropine and 4-fluorobenzaldehyde the corresponding 2-methyl-3-benzalamino-4(3H)-quinazolinones (Schiff bases) have been obtained. Reactions of the above mentioned Schiff bases with NaBH4 afforded corresponding 2-methy-3-benzylamino-4(3H)-quinazolinones. These compounds, when treated with hydrogen chloride, gave water soluble hydrogen chloride salts. The synthesized compounds are crystalline substabces, soluble in polar organic solvents, unstable at melting temperatures. The structures of obtained 2-methyl-3-benzalamino- and 2-methyl-3-benzylamino-4(3H)-quinazolinones are confirmed by their IR and 1H NMR spectra.