A series of novel 2-benzylamino-3-substituted quinazolin-4 (3H)-ones have been synthesized by treating 3-amino-2-benzylamino quinazolin-4 (3H)-one, with different aldehydes and ketones. The starting material 3-amino-2-benzylamino quinazolin-4 (3H)-one was synthesized by nucleophilic substitution of thiomethyl group of 3-amino-2-methylthio quinazolin-4 (3H)-one by benzylamine. The title compounds were investigated for ...