Abstract: The present invention relates to phenylethynyl compounds of formula I wherein R1, R2, X, L, R3, R4, R4?, cyc, and n are as defined in the specification and claims and to a pharmaceutically acceptable acid addition salt, to a racemic mixture, or to its corresponding enantiomer and/or optical isomer and/or stereoisomer thereof. Compounds of formula I are positive allosteric modulators (PAM) of the metabotropic glutamate receptor subtype 5 (mGluR5). They are useful for the treatment of schizophrenia or cognitive diseases.

Abstract: The present invention relates to ethynyl derivatives of formula I wherein G, X, R1, R2, R3, R3?, R4, and R4? are as defined herein or to a pharmaceutically acceptable acid addition salt, to a racemic mixture, or to its corresponding enantiomer and/or optical isomer and/or stereoisomer thereof. Compounds of formula I are positive allosteric modulators (PAM) of the metabotropic glutamate receptor subtype 5 (mGluR5).

Abstract: The present invention relates to ethynyl derivatives of formula I wherein Y is N or C—R3; R3 is hydrogen, methyl, halogen or nitrile; R1 is phenyl or pyridinyl, each of which is optionally substituted by halogen, lower alkyl or lower alkoxy; R2/R2? are each independently hydrogen, lower alkyl or lower alkyl substituted by halogen, or R2 and R2? together with the N-atom to which they are attached form a morpholine ring, a piperidine ring or an azetidine ring, each of which is unsubstituted or substituted one or more substituents selected from lower alkoxy, halogen, hydroxy and methyl; R4/R4? are each independently hydrogen or lower alkyl, or R4 and R4? together form a C3-5 cycloalkyl-, tetrahydrofuran- or an oxetane-ring; or to a pharmaceutically acceptable acid addition salt, to a racemic mixture, or to its corresponding enantiomer and/or optical isomer and/or stereoisomer thereof.

Abstract: 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).

Abstract: The present invention relates to phenylethynyl compounds of formula I wherein R1, R2, X, L, R3, R4, R4?, cyc, and n are as defined in the specification and claims and to a pharmaceutically acceptable acid addition salt, to a racemic mixture, or to its corresponding enantiomer and/or optical isomer and/or stereoisomer thereof. Compounds of formula I are positive allosteric modulators (PAM) of the metabotropic glutamate receptor subtype 5 (mGluR5). They are useful for the treatment of schizophrenia or cognitive diseases.