The present invention provides a diamine derivative or the like represented by the general formula (I):
wherein Q represents an oxygen atom or the like, RG represents a hydrogen atom or the like, RI represents
(wherein p and r may be the same or different, and each represents 0 or the like, RA represents a hydrogen atom or the like, and RB and Rc may be the same or different, and each represents a hydrogen atom or the like), RH represents a hydrogen atom or the like, and RJ represents:
(wherein q and s may be the same or different, and each represents 0 or the like, RD represents a hydrogen atom or the like, and RE and RF may be the same or different, and each represents a hydrogen atom or the like) or the like}, etc.
Diamine Derivatives Containing Imidazolidinylidene Propanedinitrile as a New Class of Histamine H3 Receptor Antagonists: Conformationally Restricted Derivatives
Novel conformationally restricted diamine derivatives containing imidazolidinylidene propanedinitrile were synthesized and evaluated for human and rat histamine H(3) receptor (H(3)R) binding affinities. Among them, compounds 2b, 2c, 2j, 2k and 2m were found to be potent ligands for both H(3)Rs with K(i) values in the sub-nanomolar range, and showed potent H(3) receptor antagonism.