The present invention relates to novel quinoline compounds. The compounds possess valuable therapeutic properties and are particularly suitable, for treating diseases that respond to modulation of the serotonin 5-HT6 receptor. wherein R is a moiety of the formula wherein A, R1 to R4 are as defined in the claims and the specification, n is 0, 1 or 2； m is 0, 1, 2 or 3； Ra, Rb are independently selected from the group consisting of halogen, CN, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C(O)Raa, C(O)NRccRbb and NRccRbb； X is CH2, C(O), S, S(O) or S(O)2； which is located in the 3- or 4-position of the quinoline ring； Ar is a radical Ar1, Ar2&mdash；Ar3 or Ar2&mdash；O&mdash；Ar3, wherein Ar1, Ar2 and Ar3 are each independently selected from the group consisting of aryl or hetaryl wherein aryl or hetaryl moieties may be unsubstituted or may carry 1, 2, 3 substituents Rx, wherein and physiologically tolerated acid addition salts and the N-oxides thereof.
