4,5-Dihydropyridazin-3-one derivatives as histamine H3 receptor inverse agonists
摘要:
H3R structure-activity relationships for a new class of 4,5-dihydropyridazin-3-one H3R antagonists/inverse agonists are disclosed. Modification of the 4,5-dihydropyridazinone moiety to block in vivo metabolism identified 4,4-dimethyl-6-{4-[3-((R)-2-methyl-pyrrolidin-1-yl)-propoxy]-phenyl}-4,5-dihydro-2H-pyridazin-3-one 22 as a lead candidate demonstrating potent in vivo functional H3R antagonism in the rat dipsogenia model and robust wake promoting activity in the rat EEG/EMG model. (C) 2011 Elsevier Ltd. All rights reserved.
The present invention provides compounds of formula (I*):
their use as H
3
inhibitors, processes for their preparation, and pharmaceutical compositions thereof.
The present invention is directed to novel pyridazinone derivatives that mediate enzymatic activity. In particular, the compounds may be effective in the treatment of diseases or disease states related to the activity of the histamine H3 receptor, including, for example, neurodegenerative disorders, sleep/wake disorders, attention deficit hyperactivity disorder and cognition/cognitive disorders.
The present invention provides compounds of formula (I*):
their use as H3 inhibitors, processes for their preparation, and pharmaceutical compositions thereof.