The present invention relates to ethynyl derivatives of formula I wherein R1 is hydrogen or halogen; R2 is C1-3-alkyl or -(CH2)m-O-CH3; n is 2 or 3; m is 1 or 2; 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 been found that the compounds of general formula I are allosteric modulators of the metabotropic glutamate receptor subtype 5 (mGluR5) with improved properties for the treatment of schizophrenia, cognitive diseases, fragile X syndrome or autism.
本发明涉及式I的
乙炔衍
生物,其中R1是氢或卤素;R2是C1-3-烷基或-(
CH2)m-O-
CH3;n为2或3;m为1或2;或者是其对应的药学可接受的酸盐,或者是其对映体和/或光学异构体和/或立体异构体的混合物。已发现一般式I的化合物是代谢型谷
氨酸受体亚型5(mGluR5)的变构调节剂,具有改善的特性,可用于治疗精神分裂症、认知疾病、脆性X综合症或自闭症。