The present invention relates to ethynyl compounds of formula I
wherein
R1, R2, R2′, R3, R3′, R4, R4′, U, V, W, Y, m, and n are as defined herein and to a pharmaceutically acceptable acid addition salts, to a racemic mixtures, or to its corresponding enantiomers and/or optical isomers and/or stereoisomers thereof. Compounds of formula I are allosteric modulators of the metabotropic glutamate receptor subtype 5 (mGluR5).
The present invention relates to ethynyl derivatives of formula (I) as allosteric modulators of the metabotropic glutamate receptor subtype 5 (mGluR5). The variables in formula (I) are defined in the specification.