SOME 2, 3‐DISUBSTITUTED 3H‐4‐QUINAZOLONES AND 3H‐4‐THIOQUINAZOLONES

Some 2‐alkyl‐3‐aryl‐3H‐4‐quinazolones (I; X = 0) have been prepared and a number of them converted into the thioquinazolones (I; X = S). A new method for the synthesis of 3‐alkyl‐2‐aryl‐3H‐4‐quinazolones (VI) has been developed and has been employed for the synthesis of representative derivatives.