Heterocyclyl compounds as histamine H3 receptor ligands

A compound of the general formula (I):

• wherein,
• R1 is —C(O)—R4, —S(O)2—R4,
• substituted or unsubstituted cycloalkyl, aryl or heteroaryl;
• wherein substituents, may be one or more and are independently selected from hydrogen, hydroxy, halogen, alkyl, alkoxy, haloalkyl or haloalkoxy;
• R4 is substituted or unsubstituted alkyl, cycloalkyl, cycloalkylalkyl, aryl, heteroaryl, heterocyclyl or heterocyclylalkyl;
• wherein substituents, may be one or more and are independently selected from hydrogen, hydroxy, halogen, alkyl, alkoxy, haloalkyl or haloalkoxy;
• R5 is hydrogen, alkyl or cycloalkyl;
• at each occurrence, R3 is independently selected from hydrogen, halo, alkyl or alkoxy;
• R2 is hydrogen, substituted or unsubstituted alkyl or cycloalkyl;
• wherein substituents, may be one or more and are independently selected from hydrogen, hydroxy, halogen, alkyl, alkoxy, haloalkyl or haloalkoxy;
• X is S, N or O;
• Y is C or N;
• “p” is an integer ranging from 0 to 2;
• “q” is an integer ranging from 0 to 2;
• “r” is an integer ranging from 0 to 1;
• or a pharmaceutically acceptable salt thereof.