The diverse biological activities of various functional derivatives of 4-substituted alkyl-1-(2H)- phthalazinones are well known. Some of the phthalazinone derivatives have found application in clinical medicine because of their pronounced antipyretic, analgesic, and tuberculostatic activity while others have shown interesting vasodilator [ 1 1. Demirayak , S. ; Karaburun , AC ; Kayagil , I. ; Erol , K. ; Sirmagul , B. Some pyridazinone and phthalazinone derivatives and their ...