4-Aryl-1-piperazinylalkyl derivatives of 1,2,3,4-tetrahydro-beta-carboline ring system. Synthesis and preliminary in vivo studies.

Three series of compounds containing a 4-aryl-1-piperazinylalkyl fragment attached to a different position of the indole (A) or 1,2,3,4-tetrahydro-beta-carboline (B, C) have been prepared. The quantitative relationship between the structure of some derivatives and their sedative effect was found using the Free-Wilson approach.