Add time:07/12/2019         Source:sciencedirect.com

A novel series of 3,4-diaza-bicyclo[4.1.0]hept-4-en-2-ones were designed and synthesized as H3R analogs of irdabisant 6. Separation of the isomers, assignment of the stereochemistry by crystallography, and detailed profiling of diastereomers 25 and 26 led to the identification of (1R,6S)-5-{4-[3-((R)-2-methyl-pyrrolidin-1-yl)propoxy]phenyl}-3,4-diaza-bicyclo[4.1.0]hept-4-en-2-one 25 as a potential second generation H3R candidate. Diastereomer 25 had high H3R binding affinity, excellent selectivity, displayed potent H3R functional antagonism and robust wake-promoting activity in vivo, and showed acceptable pharmacokinetic and pharmaceutical profiles for potential further development.

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