The present invention relates to ethynyl derivatives of formula (I), wherein, Y is N or C-R3;and R3 is hydrogen, methyl, halogen or nitrile; R1 is phenyl or pyridinyl, which are optionally substituted by halogen, lower alkyl or lower alkoxy; R2/R2' are independently from each other hydrogen, lower alkyl or lower alkyl substituted by halogen, or R2 and R2' may form together with the N-atom to which they are attached a morpholine ring, a piperidine ring or an azetidine ring, which are unsubstituted or substituted one or more substituents selected from lower alkoxy, halogen, hydroxy or methyl; R4/R4' are independently from each other hydrogen or lower alkyl, or R4 and R4' form together 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. 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,Y是N或C-R3;R3是氢、甲基、卤素或腈基;R1是苯基或
吡啶基,可以选择地被卤素、低烷基或低烷氧基取代;R2/R2'分别是氢、低烷基或被卤素取代的低烷基,或者R2和R2'可以与它们连接的N原子一起形成
吗啡啉环、
哌啶环或氮杂环,该环未被取代或被一个或多个从低烷氧基、卤素、羟基或甲基中选择的取代基取代;R4/R4'分别是氢或低烷基,或者R4和R4'一起形成C3-5环烷基、
四氢呋喃环或氧杂环;或者是药学上可接受的酸盐,或者是消旋混合物,或者是其对应的对映体和/或光学异构体和/或立体异构体。令人惊讶的是发现,通用公式(I)的化合物是代谢型谷
氨酸受体亚型5(mGluR5)的阳性变构调节剂(P
AM)。