Base catalysed condensation of ketone 5 with different aldehydes give chalcones, 2.4-bis- (phenylamino)-6-[4′-{3 ″-(4‴-substituted phenyl/2‴-furanyl/2‴-thienyl)-2 ″-propenon-1 ″-yl} phenylamino]-s-thriazines 6a–e. These chalcones on cyclization with hydrazine hydrate in the presence of glacial acetic acid, guanidine nitrate in the presence of alkali and malononitrile in the presence of ammonium acetate give the corresponding ...