Synthesis and anticonvulsant activity of pyrano[4′,3′:4,5]pyrido[2,3-b]thieno[3,2-d] pyrimidine derivatives and pyrimido[5′,4′:2,3]-thieno[2,3-c]isoquinoline derivatives

Methods for the synthesis of condensed thieno[3,2-d]pyrimidines based on pyrano[4,3-d]thieno[2,3-b]pyridines and thieno[2,3-b]isoquinolines have been developed and a series of new derivatives have been synthesized. The anticonvulsant activity of the synthesized compounds has been studied. Several compounds possessing specific anticonvulsant activity with respect to corazole-induced convulsions are revealed.