The present invention relates to compounds of the general formula (I), or pharmaceutically acceptable salts or acid addition salts thereof, racemic mixtures, or the corresponding enantiomers and / or optical isomers and / or stereoisomers thereof, (I) In this formula, Y is N or CR &apos；； Two, or three, selected from the group consisting of phenyl, pyridinyl having different N-positions, imidazolyl, pyrazinyl, pyrimidinyl, thiophenyl, thiazolyl, pyrazolyl and thiadiazolyl. A 5 or 6 membered aromatic or heteroaromatic ring containing a heteroatom, optionally substituted with 1, 2 or 3 substituents selected from the group consisting of halogen, lower alkyl, lower alkoxy, lower alkoxy substituted by halogen, and NRR ''Substituted； R and R ''independently from each other may be hydrogen or lower alkyl, or they may form a 5 or 6 membered saturated heterocyclic group which may contain additional oxygen, NH or N-lower alkyl groups with the N atom to which they are attached； R 1 is hydrogen, halogen, or lower alkyl substituted by halogen； R 1 '' is hydrogen, halogen, or lower alkyl substituted by halogen； R <； 2 >； is hydrogen, lower alkyl, lower alkoxyalkyl, cycloalkyl or heterocycloalkyl, or a group <； / RTI >； A is -CH 2 -, -CH 2 CH 2 or -C (CH 3)2 - and； R 3 is phenyl or pyridinyl, the N atom of the pyridinyl group may be present at different positions. It has surprisingly been found that the compounds of formula I are useful for the treatment of Parkinson''s disease, anxiety, vomiting, obsessive compulsive disorder, autism, neuroprotection, cancer, depression or type 2 diabetes mellitus receptor 4 (mGluR4) ).본 발명은 하기 화학식 I의 화합물, 또는 이의 약학적으로 허용되는 염 또는 산 부가 염, 라세미체 혼합물, 또는 이의 상응하는 거울상이성질체 및/또는 광학이성질체 및/또는 입체이성질체에 관한 것이다: [화학식 I]상기 식에서,Y는 N 또는 C-R1'이고；G는 페닐, 상이한 N-위치를 갖는 피리딘일, 이미다졸일, 피라진일, 피리미딘일, 티오페닐
