Novel, potent, and selective 5-HT3 receptor antagonists based on the arylpiperazine skeleton: Synthesis, structure, biological activity, and comparative molecular field analysis studies

Maurizio Anzini, Andrea Cappelli, Salvatore Vomero, Gianluca Giorgi, Thierry Langer, Michel Hamon, Nacera Merahi, Boris M. Emerit, Alfredo Cagnotto, Malgorzata Skorupska, Tiziana Mennini, Julia C. Pinto

Research output: Contribution to journalArticlepeer-review

Abstract

Synthesis and pharmacological evaluation of a series of condensed quinoline derivatives bearing a basic nitrogen on piperazine or [(dimethylamino)ethyl]thio moieties attached at the 2-position of the quinoline nucleus are described. 5-HT receptor binding studies revealed, for most of the compounds studied, nanomolar affinity for the 5-HT3 receptor subtype. The most active compound, benzopyrano[3,4-c]quinoline derivative 5f, displayed a Ki value very similar to that reported for quipazine along with an improved selectivity. Functional and in vivo testing carried out on three selected compounds showed that 5f,j,n are potent 5-HT3 receptor antagonists with potencies in the same range as the best known 5-HT3 receptor antagonists ondansetron, tropisetron, and zacopride. The crystal and molecular structures of compounds 5f,j,n were determined by single-crystal X-ray diffraction and used as starting structures for molecular modeling studies. Comparative molecular field analysis (CoMFA) was applied to binding constants of compounds 5a-p and 6a-h. The cross-validated r2, derived from partial least-squares calculations, indicated a good predictive capacity for affinity values in the series of compounds investigated. Evidence for the prediction capacity is provided in the form of plots of actual vs predicted pKi values. The steric and electrostatic features of the CoMFA-derived model are presented as standard coefficient contour maps of steric and electrostatic fields.

Original languageEnglish
Pages (from-to)2692-2704
Number of pages13
JournalJournal of Medicinal Chemistry
Volume38
Issue number14
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Organic Chemistry

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