Abstract: The invention relates to compounds having pharmacological activity towards the sigma receptor, and more particularly to pyrazole derivatives of formula (I) and to processes of preparation of such compounds, to pharmaceutical compositions comprising them, and to their use therapy and prophylaxis, in particular for the treatment of psychosis or pain.

Abstract: New derivatives of cyanoaryl (or cyanoheteroaryl)-carbonyl-piperazinyl-pyrimidines (I), where R1 represents an OR3 radical, where R3 represents a radical derived from a saturated hydrocarbon, with a linear or branched chain of 1 to 4 carbon atoms, and R2 represents a phenyl radical substituted at least by one cyan radical (—C≡N), or a radical of a heteroaromatic ring of 5 or 6 members substituted at least by one cyan radical (—C≡N); and their physiologically acceptable salts, are useful for application in human and/or veterinary therapeutics as sedatives, anticonvulsants, hypnotics and general anaesthetics.

Abstract: The derivatives of acyl-piperazinyl-pyrimidines of general formula (I), where X is O or S; R1 is alkoxy or trifluoromethyl; R2 is alkyl, cycloalkyl, heterocycloalkyl, aryl, arylalkyl, heteroaryl, or heteroarylalkyl, show activity in the central nervous system. Compounds of general formula (I) in which X is O can be obtained by reacting a derivative of pyrimidine with a derivative of piperazine or by reacting a derivative of piperazinyl-pyrimidine with a carboxylic acid or a salt or derivative thereof. Compounds of general formula (I) in which X is S can be obtained by reacting (I) in which X is O with Lawesson's reagent or with phosphorous pentasulphide.