Discovery of Spirofused Piperazine and Diazepane Amides as Selective Histamine-3 Antagonists with in Vivo Efficacy in a Mouse Model of Cognition
作者:Dean G. Brown、Peter R. Bernstein、Andrew Griffin、Steve Wesolowski、Denis Labrecque、Maxime C. Tremblay、Mark Sylvester、Russell Mauger、Phillip D. Edwards、Scott R. Throner、James J. Folmer、Joseph Cacciola、Clay Scott、Lois A. Lazor、Mehrnaz Pourashraf、Vijayaratnam Santhakumar、William M. Potts、Simon Sydserff、Pascall Giguère、Carine Lévesque、Mohammed Dasser、Thierry Groblewski
DOI:10.1021/jm4014828
日期:2014.2.13
A new series of potent and selective histamine-3 receptor (H3R) antagonists was identified on the basis of an azaspiro[2.5]octane carboxamide scaffold. Many scaffold modifications were largely tolerated, resulting in nanomolar-potent compounds in the H3R functional assay. Exemplar compound 6s demonstrated a selective profile against a panel of 144 secondary pharmacological receptors, with activity at only sigma 2 (62% at 10 mu M). Compound 6s demonstrated free-plasma exposures above the IC50 (similar to 50x) with a brain-to-plasma ratio of similar to 3 following intravenous dosing in mice. At three doses tested in the mouse novel object recognition model (1, 3, and 10 mg/kg s.c.), 6s demonstrated a statistically significant response compared with the control group. This series represents a new scaffold of H-3 receptor antagonists that demonstrates in vivo exposure and efficacy in an animal model of cognition.