4,4-Disubstituted piperidine derivatives, processes for their preparation and pharmaceutical compositions thereof.

摘要

The invention relates to compounds of formula (I), <CHEM> wherein R<1> represents hydrogen or -CONHR , wherein R represents hydrogen or alkyl, cycloalkyl, or carbocyclic aryl or carbocyclic aryl-alkyl optionally substituted on the aromatic ring by one or more halogen atoms, alkyl or alkoxy ; R<2> represents ethynyl or acetyl ; Ph<1> and Ph<2>, which may be the same or different, each represents phenyl unsubstituted or substituted by one or more halogen atoms, alkyl, alkoxy, or trihalomethyl or hydroxy optionally esterified by an alkanoic acid; and n is 1 or 2, and optical isomers and mixtures thereof and all acid addition and quaternary ammonium salts thereof, to pharmaceutical compositions containing these compounds and processes for their preparation. the compounds of formula (I) appear useful for the treatment of psychotic disorders, insomnia, mania, agitation, depression, anxiety, emesis, pain and dementia.