(INDOL-4-YL) OR (INDOL-5-YL)-PIPERAZINYLMETHANONES

摘要

The present invention relates to compounds of formula I wherein one of R¹ and R² is hydrogen and the other one is and wherein A and R¹ to R⁴ 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.