| abstract |
The present invention relates to compounds of formula I n nwherein n R 1 is selected from the group consisting of hydrogen or lower alkyl; R 2 is hydrogen, lower alkyl, lower alkenyl, lower alkyl substituted by hydroxy, lower alkyl substituted by halogen, n —(CH 2 ) x —S-lower alkyl, —(CH 2 ) x —O-lower alkyl, —(CH 2 ) x —NHC(O)O-lower alkyl, —(CH 2 ) x -aryl, and —(CH 2 ) x -heteroaryl; n each R 3 is selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, halogen, hydroxy, lower alkyl substituted by halogen, n —O—(CH 2 ) m -aryl, —O—(CH 2 ) m -heteroaryl, —(CR 2 ) m -aryl, and —(CR 2 ) m -heteroaryl; each R is selected from the group consisting of hydrogen, lower alkyl and hydroxy; Ar is selected from the group consisting of phenyl, pyrimidin-2-yl, pyrimidin-4-yl and pyridin-3-yl; n is 0, 1 or 2; x is 0, 1, 2 or 3; m is 0 or 1; and to their pharmaceutically active salts. |