Sulfonyldihydroimidazopyridinone compounds as 5-hydroxytryptamine-6 ligands

A pharmaceutical composition which comprises a pharmaceutically acceptable carrier and an effective amount of a compound of formula I

• wherein
• Q is —(CR2R3)n—NR4R5,
• W is N;
• X is CR7;
• Y is CR8;
• Z is CR9;
• R is an optionally substituted aryl or heteroaryl group or an optionally substituted 8-membered bicyclic ring system having a N atom at the bridgehead and containing 2 additional heteroatoms selected from N or S wherein said ring system is an imidazothiazole ring;
• R7, R8 and R9 are each independently H;
• R2 and R3 are each independently H or an optionally substituted C1-C6alkyl group;
• n is an integer of 2, 3, 4 or 5;
• p is 0 or an integer of 1 or 2
• R4 and R5 are each independently H or a C1-C6alkyl group;
• R6 is H or an optionally substituted C1-C6alkyl group;
• and
• represents a single bond or a double bond;
• or
• a stereoisomer thereof or a pharmaceutically acceptable salt thereof.