| abstract |
The present invention relates to a compound of the general formula (I) wherein R 1 /R 2 are independently from each other lower alkyl, or form together with the N-atom to which they are attached a heterocyclic group, selected from pyrrolidine, piperidine, piperazine, 4-methyl-piperazine, 4-cyclopropyl-piperazine, thiomorpholine, morpholine, 1-(3-oxa-8-aza- bicyclo[3.2.1]oct-8-yl or 1-(2-oxa-6-aza-spiro[3.3]hept-6-yl; X is a bond, -CH 2 - or -O-; Ar 1 is aryl or heteroaryl, which are unsubstituted or substituted by one or two substituents selected from halogen, lower alkyl, lower alkoxy, or lower alkyl substituted by halogen; Ar 2 is aryl or heteroaryl, which are unsubstituted or substituted by one, two or three substituents selected from halogen, lower alkyl, lower alkoxy, hydroxy, lower alkyl substituted by halogen, lower alkoxy substituted by halogen, S-lower alkyl, benzyl or phenyl; or to a pharmaceutically acceptable acid addition salt, to a racemic mixture, or to their corresponding enantiomers and/or optical isomers thereof. It has surprisingly been found that the compounds of general formula (I) are good inhibitors of the glycine transporter 1 (GIyT-1), and that they have a good selectivity to glycine transporter 2 (GlyT-2) inhibitors. |