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Abstract
We previously designed and synthesized a series of histamine analogues with an imidazolylcyclopropane scaffold and identified potent non-selective antagonists for histamine H3 and H4 receptor subtypes. In this study, to develop H4 selective ligands, we newly designed and synthesized cyclopropane-based derivatives having an indole, benzimidazole, or piperazine structure, which are components of representative H4 selective antagonists such as JNJ7777120 and JNJ10191584. Among the synthesized derivatives, imidazolylcyclopropanes 12 and 13 conjugated with a benzimidazole showed binding affinity to the H3 and H4 receptors comparable to that of a well-known non-selective H3/H4 antagonist, thioperamide. These results suggest that the binding modes of the cyclopropane-based H3/H4 ligands in the H4 receptor can be different from those of the indole/benzimidazole-piperazine derivatives.
Published Version
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