Abstract: A class of substituted imidazolo[5,1-a]phthalazine derivatives as ligands for GABAA receptors which are partial or full inverse agonists of an &agr;5 receptor subunit while being relatively free of activity at &agr;1 and/or &agr;2 and/or &agr;3 receptor subunit binding sites; they are therefore of benefit as a medicament for enhancing cognition but with the reduction or elimination of procon-vulsant activity.

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: Novel sulfamides of formula (1) are disclosed. The compounds exert an inhibitory action on the processing of APP by gamma-secretase, and are therefore useful in the treatment or prevention of Alzheimer's disease.

Abstract: A class of compounds is disclosed, comprising sulphonamido-substituted bridged bicycloalkyl structures. The compounds are inhibitors of gamma-secretase, and hence are useful in the treatment of and/or prevention of Alzheimer's disease.

Abstract: 7-(1,1 -Dimethylethyl)-6-(2-ethyl-2H-1,2,4-triazol-3-ylmethoxy)-3-(2-fluorophenyl)-1,2,4-triazolo[4,3-b]pyridazine, and pharmaceutically acceptable salts thereof are selective ligands for GABAA receptors useful in the treatment of disorders of the central nervous system.

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: 1,2,4-triazolo[4,3-b]pyridazine derivatives, possessing an optionally substituted cycloalkyl, phenyl or heteroaryl substituent as the 3-position and an amino 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: 1,2,4-triazolo[4,3-b]pyridazine derivatives, represented by wherein Z represents cyclobutyl or pyrrolidin-1-yl, 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 compounds of formula (I) wherein Z, E, Q, T, U, V, W, M, R.sup.1, R.sup.7 and R.sup.8 are as defined herein; 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.

Abstract: A class of 3-substituted 3,7-diazabicyclo[3.3.0]octane derivatives, further substituted at the 7-position by an optionally substituted alkenyl, alkynyl, arylcarbonyl, aryl-alkyl or heteroaryl-alkyl moiety, 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.

Abstract: A class of 2,7-diazabicyclo[3.3.0]octane derivatives represented by formula I are selective agonists of the 5-HT.sub.1D.alpha. receptor. The compounds are useful in the treatment of migraine and related conditions.

Abstract: A class of N-substituted piperazine, piperadine and tetrahyrdopyridine derivatives of formula (I), further substituted at the 4-position by an optionally substituted aryl-alkyl or heteroaryl-alkyl moiety, are selective agonists of 5-HT.sub.1 -like receptors, being potent agonists of the human 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. In formula (I) Z represents --SO.sub.2 NR.sup.5 R.sup.6, or a group of formula (b).

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.