Azole derivatives as histamine H3 receptor antagonists, Part 2: C–C and C–S coupled heterocycles

Abstract With a small series of compounds we demonstrated the variability in the core region of the human histamine H 3 receptor ( h H 3 R) antagonist structural blueprint by introducing polar azole groups (oxazole, oxadiazole, thiazole and triazole). Additional variations achieved by coupling different residues to the heterocyclic core structure led to further optimisation of in vitro receptor binding of the novel azole derivatives.