Introduction of a new complex imide system into the structure of LCAPs. The synthesis and a 5-HT(1A), 5-HT(2A) and D(2) receptor binding study.

摘要

A series of 17 long-chain arylpiperazines containing bulky, complex imide systems (5,8-dimethyl-3b,9-epoxy-(3a,4,5,6,7,8,9,9a)-octahydro-1H-benzo[e]isoindol e-1,3(2H)-dione or 4,9-diphenyl-4,9-epoxy-3a,4,9,9a-tetra-hydro-1H-benzo[f]isoindole-1,3(2H)- dione) was synthesized and evaluated for their affinity for serotonin 5-HT(1A), 5-HT(2A) and dopamine D(2) receptors. Most of the new compounds showed moderate activity at 5-HT(1A) binding sites (K(i) = 100-492 nM), and two derivatives were found to have marked affinity for the 5-HT(2A) receptor subtype. None of the tested compounds displayed appreciable binding to dopamine D(2) receptors Structure-activity relationships were discussed in respect to an arylpiperazine fragment, whereas the comparison of different imide terminals enabled determination of the size of a hydrophobic pocket (approximately 300 A(3)) within the 5-HT(1A) receptor.