Tricyclic aminopyrimidine histamine H4 receptor antagonists

This report discloses the development of a series of tricyclic histamine H-4 receptor antagonists. Starting with a low nanomolar benzofuranopyrimidine HTS hit devoid of pharmaceutically acceptable properties, we navigated issues with metabolism and solubility to furnish a potent, stable and water soluble tricyclic histamine H-4 receptor antagonist with desirable physiochemical parameters which demonstrated efficacy a mouse ova model. (C) 2011 Elsevier Ltd. All rights reserved.