Compounds comprising an oxazole or thiazole moiety, processes for making them, and their uses

The present invention relates to compounds comprising an oxazole or thiazole moiety of formula (I), processes for preparing them, pharmaceutical compositions comprising said compounds and their uses as H3-receptor ligands, Formula (I), wherein, A1 is CH, C(alkyl), C-halogen or N; R1 is hydrogen, halogen, C1-6 alkyl or alkoxy; R2 is, Formula (II′), A3 is O or S; R3 is hydrogen, halogen, C1-6 alkyl or alkoxy; R4 is hydrogen, halogen, C1-6 alkyl, alkoxy or -O-L; R5 is hydrogen or -O-L, wherein L is an aminoalkyl group and at least one of R4 and R5 should be -O-L.