Synthesis and Structure−Activity Relationships of Conformationally Constrained Histamine H3 Receptor Agonists
摘要:
Immepip, a conformationally constrained analogue of the histamine congener imbutamine, shows high affinity and functional activity on the human H-3 receptor. Using histamine and its homologues as prototypes, other rigid analogues containing either a piperidine or pyrrolidine ring in the side chain were synthesized and tested for their activities at the human H-3 receptor and the closely related H-4 receptor. In the series of piperidine containing analogues, immepip was found to be the most potent H-3 receptor agonist, whereas its propylene analogue 13a was identified as a high-affinity neutral antagonist for the human H-3 receptor. Moreover, replacement of the piperidine ring of immepip by a pyrrolidine ring led to a pair of enantiomers that show a distinct stereoselectivity at the human H-3 and H-4 receptor.
Identification of 4-(1<i>H</i>-Imidazol-4(5)-ylmethyl)pyridine (Immethridine) as a Novel, Potent, and Highly Selective Histamine H<sub>3</sub> Receptor Agonist
作者:Ruengwit Kitbunnadaj、Obbe P. Zuiderveld、Bernard Christophe、Saskia Hulscher、Wiro M. P. B. Menge、Edith Gelens、Erwin Snip、Remko A. Bakker、Sylvain Celanire、Michel Gillard、Patrice Talaga、Henk Timmerman、Rob Leurs
DOI:10.1021/jm049932u
日期:2004.5.1
In this study, the piperidine ring of immepip and its analogues was replaced by a rigid heterocyclic pyridine ring. Many compounds in the series exhibit high affinity and agonist activity at the human histamine H(3) receptor. Particularly, the 4-pyridinyl analogue of immepip (1c, immethridine) is identified as a novel potent and highly selectivehistamine H(3) receptoragonist (pK(i) = 9.07, pEC(50)
Synthesis and Structure−Activity Relationships of Conformationally Constrained Histamine H<sub>3</sub> Receptor Agonists
作者:Ruengwit Kitbunnadaj、Obbe P. Zuiderveld、Iwan J. P. De Esch、Roeland C. Vollinga、Remko Bakker、Martin Lutz、Anthony L. Spek、Emile Cavoy、Marie-France Deltent、Wiro M. P. B. Menge、Henk Timmerman、Rob Leurs
DOI:10.1021/jm030905y
日期:2003.12.1
Immepip, a conformationally constrained analogue of the histamine congener imbutamine, shows high affinity and functional activity on the human H-3 receptor. Using histamine and its homologues as prototypes, other rigid analogues containing either a piperidine or pyrrolidine ring in the side chain were synthesized and tested for their activities at the human H-3 receptor and the closely related H-4 receptor. In the series of piperidine containing analogues, immepip was found to be the most potent H-3 receptor agonist, whereas its propylene analogue 13a was identified as a high-affinity neutral antagonist for the human H-3 receptor. Moreover, replacement of the piperidine ring of immepip by a pyrrolidine ring led to a pair of enantiomers that show a distinct stereoselectivity at the human H-3 and H-4 receptor.