Synthesis and pharmacological evaluations of sildenafil analogues for treatment of erectile dysfunction

Haroldo Alfredo Flores Toque, Fernanda Priviero, Cleber E. Teixeira, Elisa Perissutti, Ferdinando Fiorino, Beatrice Severino, Francesco Frecentese, Raquel Lorenzetti, Juliana S. Baracat, Vincenzo Santagada, Giuseppe Caliendo, Edson Antunes, Gilberto De Nucci

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The 5-[2-ethoxy-5-(4-methylpiperazin-1-ylsulfonyl)phenyl]-1-methyl-3- propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one, sildenafil, is a cGMP-specific phosphodiesterase-5 (PDE5) inhibitor used for penile erectile dysfunction. In the search for more potent and selective PDE5 inhibitors, new sildenafil analogues (6a-v), characterized by the presence on the sulfonyl group in the 5′ position of novel N-4-substituted piperazines or ethylenediamine moiety, were prepared by traditional and microwave-assisted synthesis and tested in rabbit isolated aorta and corpus cavernosum. Similarly to sildenafil, several analogues showed IC50 values in the nanomolar range. In the in vitro studies, all the tested compounds caused concentration-dependent relaxations in both rabbit isolated aorta and corpus cavernosum. All sildenafil analogues potentiated the nitric oxide-dependent vasodilation in endothelium-intact rabbit aorta. Compound 6f exhibited great pEC50 value in corpus cavernosum, and compounds 6r and 6u in isolated aorta were found as potent as sildenafil for inhibiting PDE5. Because several analogues were significantly more lipophilic than sildenafil, these compounds may offer a new lead for development of new sildenafil analogues.

Original languageEnglish (US)
Pages (from-to)2807-2815
Number of pages9
JournalJournal of Medicinal Chemistry
Volume51
Issue number9
DOIs
StatePublished - May 8 2008
Externally publishedYes

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Erectile Dysfunction
Pharmacology
Aorta
Phosphodiesterase 5 Inhibitors
ethylenediamine
Rabbits
Piperazines
Type 5 Cyclic Nucleotide Phosphodiesterases
Microwaves
Sildenafil Citrate
Vasodilation
Inhibitory Concentration 50
Endothelium
Nitric Oxide

ASJC Scopus subject areas

  • Molecular Medicine
  • Drug Discovery

Cite this

Synthesis and pharmacological evaluations of sildenafil analogues for treatment of erectile dysfunction. / Flores Toque, Haroldo Alfredo; Priviero, Fernanda; Teixeira, Cleber E.; Perissutti, Elisa; Fiorino, Ferdinando; Severino, Beatrice; Frecentese, Francesco; Lorenzetti, Raquel; Baracat, Juliana S.; Santagada, Vincenzo; Caliendo, Giuseppe; Antunes, Edson; De Nucci, Gilberto.

In: Journal of Medicinal Chemistry, Vol. 51, No. 9, 08.05.2008, p. 2807-2815.

Research output: Contribution to journalArticle

Flores Toque, HA, Priviero, F, Teixeira, CE, Perissutti, E, Fiorino, F, Severino, B, Frecentese, F, Lorenzetti, R, Baracat, JS, Santagada, V, Caliendo, G, Antunes, E & De Nucci, G 2008, 'Synthesis and pharmacological evaluations of sildenafil analogues for treatment of erectile dysfunction', Journal of Medicinal Chemistry, vol. 51, no. 9, pp. 2807-2815. https://doi.org/10.1021/jm701400r
Flores Toque, Haroldo Alfredo ; Priviero, Fernanda ; Teixeira, Cleber E. ; Perissutti, Elisa ; Fiorino, Ferdinando ; Severino, Beatrice ; Frecentese, Francesco ; Lorenzetti, Raquel ; Baracat, Juliana S. ; Santagada, Vincenzo ; Caliendo, Giuseppe ; Antunes, Edson ; De Nucci, Gilberto. / Synthesis and pharmacological evaluations of sildenafil analogues for treatment of erectile dysfunction. In: Journal of Medicinal Chemistry. 2008 ; Vol. 51, No. 9. pp. 2807-2815.
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