The invention relates to heterocyclic derivatives as well as their pharmaceutically acceptable salts. The invention further relates to a process for the preparation of such compounds. The compounds of the invention are mGluR5 modulators and are therefore useful for the control and prevention of acute and/or chronic neurological disorders.本發明關於雜環衍生物以及其醫藥上可接受之鹽。本發明另外關於製備此等化合物之方法。本發明化合物為mGluR5調節劑且因此有用於控制和預防急性及/或慢性神經性病症。