A series of 1-(benzocycloalkyl)-4-(benzamidoalkyl) piperazine derivatives was prepared in order to obtain compounds with a high affinity and selectivity for 5-HT1A receptors. The modifications of aromatic substituents, the length of the alkyl chain, and the size of the ring were explored. Most of N-(1, 2, 3, 4-tetrahydronaphthyl)-N'-(benzamidoethyl) piperazines (32-37) were bound to 5-HT1A receptors in a nanomolar range and presented a high ...