Abstract: The present invention concerns sulfonamide derivatives having the general formula and N-oxides, salts, stereoisomeric forms, racemic mixtures, prodrugs and esters thereof, wherein Q1 is —S— or —O—; R1 is hydrogen, C1-6alkyl, hydroxy, amino, halogen, aminoC1-4alkyl and mono- or di(C1-4alkyl)amino; R2 is hydrogen or C1-6alkyl; R3 is C1-6alkyl, aryl, C3-7cycloalkyl, C3-7cycloalkylC1-4alkyl, or arylC1-4alkyl; R4 is hydrogen, C1-4alkyloxycarbonyl, carboxyl, optionally mono- or disubstituted aminocarbonyl, mono- or di(C1-4alkyl)aminocarbonyl, C3-7cycloalkyl, C2-6alkenyl, C2-6alkynyl or C1-6alkyl optionally substituted with one or more substituents each independently selected from aryl, Het1, Het2, C3-7cycloalkyl, C1-4alkyloxy-carbonyl, carboxyl, aminocarbonyl, mono- or di(C1-4alkyl)aminocarbonyl, aminosulfonyl, C1-4alkylS(?O)t, hydroxy, cyano, halogen or amino optionally mono- or di-substituted where the substituents are each independently selected from C1-4alkyl, aryl, arylC1-4alkyl, C3-7cycloalkyl, C3-7cycloa