Patent ID: 7897627

Claim:
A compound of formula I wherein Ar is an unsubstituted or substituted aryl or heteroaryl group, wherein the substituted aryl and heteroaryl groups are substituted by one or more substituents R 2 ; R 2 is hydroxy, halogen, lower alkyl, lower alkyl substituted by halogen, lower alkoxy, lower alkoxy substituted by halogen, C(O)-lower alkyl, nitro, NR′R″, cyano, S-lower alkyl, SO 2 -lower alkyl, cycloalkyl, heterocycloalkyl, phenyloxy, benzyloxy, phenyl, NH-phenyl or heteroaryl, wherein the phenyl and heteroaryl groups are unsubstituted or substituted by one or more substituents selected from lower alkyl and halogen; R′/R″ are each independently hydrogen or lower alkyl; R 1 is hydrogen or lower alkyl; Het is a heteroaryl group selected from the group consisting of pyrimidinyl, pyridazinyl, quinolinyl, quinoxalinyl, quinazolinyl, benzooxazolyl, and benzothiazolyl, unsubstituted or substituted by one or more substituents selected from R 3 ; R 3 is hydroxy, halogen, ═O, lower alkyl, lower alkyl substituted by halogen, lower alkoxy, phenyl, lower alkoxy substituted by halogen, nitro, cyano, SO 2 -lower alkyl, cycloalkyl or heterocycloalkyl; n is 1; or a pharmaceutically suitable acid addition salt thereof.