their H3receptorantagonistactivity. Different chain lengths and various substituents possessing different electronic and steric parameters were introduced and structure-activity relationships established. In different functional tests, the new antagonists showed high H3receptorantagonist potencies in vitro (-log Ki values of 6.4-8.4) at synaptosomes of rat cerebral cortex and low activities at histamine
The present invention relates to compounds of formula I
wherein R
1
and R
2
are as defined in the description and claims, and pharmaceutically acceptable salts thereof. The compounds are useful for the treatment and/or prevention of diseases which are associated with the modulation of H3 receptors.
A compound of formal (I) is described: wherein R
1
and R
2
are as defined in the text and wherein the compounds are intended for use in treating medical conditions characterized by an imbalance in dopamine receptor activity.