| abstract |
This refers to compounds of formula (1) in which: R¹ is CH₃, R¹ is methyl, ethyl, CF₃, cyclopropyl, CH₂OH or R¹ and R¹ can form together with the carbon atom to which a ring 1 is attached , 1-dioxo-thiollan-3-yl, R² is hydrogen, methyl, ethyl, isopropyl, tert-butyl, cyclopropyl, CH₂OH or C (CH₃) ₂OH, R³ is Cl, F, CF₃, cyano, methyl or cyclopropyl, R⁴ is hydrogen, methyl or F, or a pharmaceutically acceptable acid addition salt or salt, to a racemic mixture or to its corresponding enantiomer and / or optical isomer and / or stereoisomer thereof, for use in the treatment of psychiatric disorders such such as schizophrenia, bipolar disorder, obsessive-compulsive disorder or autism spectrum disorders. |