The present invention relates to ethynyl derivatives of formula Iwherein U is =N- or =C(R5)-； V is -CH= or -N=； W is =CH- or =N-； with the proviso that only one of U, V or W can be nitrogen. R5is hydrogen, methyl or halogen； Y is -N(R6)-, -O-, -C(R7')(R7)-, -CH2O- or -CH2S(O)2-； wherein R6is hydrogen or lower alkyl and R7/R7'are independently from each other hydrogen, hydroxy, lower alkyl or lower alkoxy； R1 is phenyl or heteroaryl, which are optionally substituted by one or two substituents, selected from halogen, lower alkyl or lower alkoxy； R2/R2'are independently from each other hydrogen, lower alkyl, hydroxy, lower alkoxy, C3-C6-cycloalkyl, CH2-lower alkoxy, or may form together with the carbon atom to which they are attached a C3-C6- cycloalkyl or a ring containing -CH2OCH2-； m is 0, 1 or 2； in case m is 1, R3/R3'are independently from each other hydrogen, lower alkyl, CH2- lower alkoxy or may form together with the carbon atom to which they are attached a C3-C6-cycloalkyl； or R3and R2may form together with the carbon atom to which they are attached a C3-6-cycloalkyl or a ring containing -(CH2)2OCH2-； n is 0 or 1； in case n is 1, R4/R4'are independently from each other hydrogen, lower alkyl, CH2- lower alkoxy or may form together with the carbon atom to which they are attached a C3-C6-cycloalkyl； R4and R2may form together with the carbon atom to which they are attached a C3-6-cycloalkyl； or if n is 0 and Y is -N(R6)-, then R6and R2may form together with the carbon atom and the nitrogen atom to which they are attached a C3-6-cycloalkyl； or if n and m are 0, then R2and R7may form together with the carbon atoms to which they are attached a C3-6-cycloalkyl； 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
