Pyridazinoquinoline compounds

The invention relates to pyridazinoquinoline coumpounds of formulae A and A', wherein: ring A is chosen from an ortho fused aromatic or heteroaromatic five- or six-membered ring; R is selected from the group consisting of halo, (1-4C)alkyl, NO2, CN, (C1-3)perfluoroalkyl, OH, OCF3, (2-4C)alkenyl, (2-4C)alkynyl, O(1-4C)alkyl, NR'R", SO2NR'R", or SOmR'; R is selected from H, (1-6C)alkyl, or -(CH2)nL; R is selected from H or -(CH2)nL; L is a variety of substituents including phenyl, heterocyclic groups and heteroaryl; n is 0-6; m is 0-2, R is selected from H, (1-6C)alkyl or (1-6C)alkylaryl; R is selected from H or -(CO)R wherein R is selected from a variety of substituents including hydrogen, (1-12C)alkyl, pyridyl, phenyl, pyridyl (1-12C)alkyl and phenyl (1-4C)alkyl; and R' and R" are selected from H, (1-4C)alkyl, (3-6C)cycloalkyl, phenyl (0-4)alkyl-, heterocycle (0-4C)alkyl- or heteroaryl (0-4C)alkyl- to pharmaceutical compositions containing them and to methods for the treatment of neurological disorders utilizing them.