The present invention relates to ethynyl derivatives of formula I wherein X is N or CH; G is N or CH; with the proviso that maximum one of X or G can be nitrogen; R1 is phenyl or pyridyl, which are optionally substituted by halogen, lower alkyl or lower alkoxy; R2 is hydrogen, lower alkyl or may form together with R 4 a C3-C6-cycloalkyl; R3/R3'/R4/R4' are independently from each other hydrogen, lower alkyl or CF3; 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. It has now surprisingly been found that the compounds of general 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X为N或CH;G为N或CH;但X或G中最多只能有一个是氮;R1为苯基或
吡啶基,可以选择地被卤素、较低烷基或较低烷氧基取代;R2为氢、较低烷基或可能与R4一起形成C3-C6环烷基;R3/R3'/R4/R4'彼此独立地为氢、较低烷基或
CF3;或者是其对应的药学上可接受的酸盐、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。令人惊讶地发现,一般公式I化合物是代谢型谷
氨酸受体亚型5(mGluR5)的正向变构调节剂(P
AM)。