Abstract: A novel class of 1,4- and 1,5-benzodiazepines of formula (I) is disclosed.

Abstract: A class of substituted 1,2,4-triazolo[4,3-b]pyridazine derivatives, possessing a fluoro-substituted phenyl ring at the 3-position and a heteroaryl-methoxy moiety at the 6-position, are selective ligands for GABAA receptors, in particular having high affinity for the &agr;2 and/or &agr;3 subunit thereof, and are accordingly of benefit in the treatment and/or prevention of disorders of the central nervous system, including anxiety and convulsions.

Abstract: A novel class of 1,4- and 1,5-benzodiazepines of formula (I) is disclosed. The compounds modulate the processing of amyloid precursor protein by &ggr;-secretase, and hence find use in the treatment or prevention of conditions associated with the deposition of &bgr;-amyloid, such as Alzheimer's disease.

Abstract: A class of substituted 1,2,4-triazolo[4,3b]pyridazine derivatives, possessing a fluoro-substituted phenyl ring at the 3-position and a heteroaryl-methoxy moiety at the 6-position, are selective ligands for GABAA receptors, in particular having high affinity for the &agr;2 and/or &agr;3 subunit thereof, and are accordingly of benefit in the treatment and/or prevention of disorders of the central nervous system, including anxiety and convulsions.

Abstract: A class of substituted 1,2,4-triazolo[4,3-]pyridazine derivatives, possessing an optionally substituted cycloalkyl, phenyl or heteroaryl substituent at the 3-position, a substituted alkoxy moiety at the 6-position, and an optionally substituted bicycloalkyl ring system at the 7-position, are selective ligands for GABAA receptors, in particular having high affinity for the &agr;2 and/or &agr;3 subunit thereof, and are accordingly of benefit in the treatment and/or prevention of disorders of the central nervous system, including anxiety and convulsions.

Abstract: 1,2,4-triazolo[4,3-b]pyridazine derivatives, possessing a fluoro-substituted phenyl ring at the 3-position and a heteroaryl-alkoxy moiety at the 6-position, are selective ligands for GABAA receptors, in particular having high affinity for the &agr;2 and/or &agr;3 subunit thereof, are useful in the treatment of anxiety and convulsions.

Abstract: Substituted triazolo-pyridazine derivative compounds represented by wherein the variables are disclosed herein are selective ligands for GABA-A receptors, particularly for the &agr;2 and/or &agr;3 subunits.

Abstract: A class of substituted azetidine, pyrrolidine and piperidine derivatives are selective agonists of 5-HT.sub.1 -like receptors, being potent agonists of the human 5-HT.sub.1D.alpha. receptor subtype whilst possessing at least a 10-fold selective affinity for the 5-HT.sub.1D.alpha. receptor subtype relative to the 5-HT.sub.1D.beta. subtype; they are therefore useful in the treatment and/or prevention of clinical conditions, in particular migraine and associated disorders, for which a subtype-selective agonist of 5-HT.sub.1D receptors is indicated, whilst eliciting fewer side-effects, notably adverse cardiovascular events, than those associated with non-subtype-selective 5-HT.sub.1D receptor agonists.