Benzenesulfonyl or sulfonamide compounds suitable for treating disorders that respond to the modulation of the serotonin 5-HT6 receptor

A compound of formula (IA)

• or a stereoisomer, tautomer, or a physiologically tolerated acid addition salt thereof,
• wherein
• X1 is NR4;
• R1 is selected from the group consisting of hydrogen, C1-C4-alkyl and fluorinated C1-C4-alkyl;
• R2 is selected from the group consisting of hydrogen and C1-C4-alkyl;
• R3 is selected from the group consisting of hydrogen, halogen, C1-C4-alkyl, fluorinated C1-C4-alkyl, C1-C4-alkoxy and fluorinated C1-C4-alkoxy;
• R4 is selected from the group consisting of hydrogen, C1-C4-alkyl and fluorinated C1-C4-alkyl;
• R5 is selected from the group consisting of C1-C6-hydroxyalkyl, C1-C6 alkoxy, C1-C6-hydroxyalkoxy, C1-C6-alkoxy-C1-C6-alkoxy, fluorinated C1-C6-alkoxy, fluorinated C1-C6-alkoxy-C1-C6-alkoxy, and a group -A-[O—B]p—O—R7;
• where
• A and B are independently of each other C1-C4-alkylene or fluorinated C1-C4-alkylene;
• R7 is C1-C4-alkyl or fluorinated C1-C4-alkyl;
• p is 0, 1, 2, 3, 4, 5 or 6;
• R6 is selected from the group consisting of halogen, C1-C2-alkyl, fluorinated C1-C2-alkyl, C1-C2-alkoxy and fluorinated C1-C2-alkoxy;
• G1 is CH2 or CH2CH2;
• G2 is CH2 or CH2CH2;
• o is 0, 1 or 2.