Piperazine derivatives as 5-ht antagonists

摘要

This invention concerns compounds of formula (I) (I) where A is a C1 or C2 alkylene chain optionally substituted by lower alkyl; Z is a bicyclic oxygen-containing aryl radical (e.g. 2,3-dihydro-1,4-benzodioxin-5-yl); R is hydrogen or lower alkyl; R1 is aryl or aryl(lower)alkyl; R2 is hydrogen or lower alkyl; and R3 is hydrogen, an alkyl group of 1 to 10 carbon atoms, cycloalkyl of 3 to 12 carbon atoms; cycloalkyl(lower)alkyl, aryl or aryl(lower)alkyl or R2 and R3 together with the nitrogen atom to which they are both attached represent a saturated heterocyclic ring which may contain a further hetero atom, and the pharmaceutically acceptable acid addition salts thereof. The compounds are 5-HT1A-antagonists which may be used, for example, in treating anxiety.