Abstract
The reaction of 3-amino-2-methylquinazoline-4-ones (4a,b) with succinic anhydride (8) gave 2-methyl-3-(N-succinimido)quinazolin-4-ones (9a,b). Cyclization of compounds (9a,b) yielded pyrrolo[1",5":2',3']pyrazolo[5',1'-b]quinazolin-1,4-diones (10a,b) which reacted with aromatic aldehydes afforded 2-arylidenopyrrolo[1",5":2',3']pyrazolo[5',1'-b]quinazolin-3,6-diones (I laf). The latter derivatives are used in the synthesis of the polyheterocyclic quinazolines (12a-f), (13a-f) and (14a-I).