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).
本发明涉及公式I的
乙炔衍
生物,其中G、X、R1、R2、R3、R3'、R4和R4'的定义如本文所述,或其药学上可接受的酸加合物,外消旋混合物,或其相应的对映体和/或光学异构体和/或立体异构体。公式I的化合物是代谢型谷
氨酸受体亚型5(mGluR5)的正变构调节剂(P
AM)。