AbstractFour novel series of 4(3H)‐quinazolinone derivatives have been prepared by cyclization of the key intermediates 3‐aryl‐2‐(3‐aryl‐3‐oxopropenyl)‐4‐(3H)‐quinazolinones with different reagents: 3‐aryl‐1‐iminocarbamoyl‐1H‐pyrazol‐5‐yl)‐4(3H)‐quinazolinones, 3‐aryl‐2‐(3‐aryl‐1‐thiocarbamoyl‐1H‐pyrazol‐5‐yl)‐4(3H)‐quinazolinones, 3‐aryl‐2‐(3‐aryl‐4,5‐dihydro‐1,2‐oxazol‐5‐yl)‐4(3H)‐quinazolinones, and 3‐aryl‐2‐(4‐aryl‐2‐thioxo‐1,2,5,6‐tetrahydro‐1,3‐diazin‐6‐yl)‐4(3H)‐quinazolinones. The an